Class / Patent application number | Description | Number of patent applications / Date published |
338021000 | Voltage surge-responsive or lightning arrester type | 48 |
20080224815 | ELECTROSTATIC DISCHARGE PROTECTION COMPONENT, AND ELECTRONIC COMPONENT MODULE USING THE SAME - An electrostatic discharge protection component comprises a ceramic sintered body having ceramic substrate | 09-18-2008 |
20080224816 | ELECTROSTATIC DISCHARGE PROTECTION COMPONENT, AND ELECTRONIC COMPONENT MODULE USING THE SAME - An electrostatic discharge protection component comprises a ceramic sintered body having ceramic substrate | 09-18-2008 |
20080238604 | VARISTOR AND LIGHT EMITTING DEVICE - In a varistor, a heat radiating portion contains the same components as ZnO that is the main component of a varistor element body, as metal oxides, thereby, the structural components of the varistor element body and the heat radiating portion are caused to be common. During firing, Ag contained in the heat radiating portion diffuses into the grain boundaries of ZnO, near the interface between surfaces of the heat radiating portion and the varistor element body. Consequently, in the varistor, cracks hardly occur between the varistor portion and the heat radiating portion during firing (or during binder removal), thereby, ensuring sufficient bonding strength between the varistor portion and the heat radiating portion. Therefore, heat conducted to the varistor portion is radiated efficiently conducting through electrically conducted paths formed in the heat radiating portion from the surface facing the varistor element body to other three surfaces of the heat radiating portion. | 10-02-2008 |
20080238605 | Voltage non-linear resistance ceramic composition and voltage non-linear resistance element - As for the voltage non-linear resistance element layer | 10-02-2008 |
20080258858 | Non-burnable varistor - A non-burnable varistor, comprises a base slice having two opposite surfaces, a first elicit pole electrically connected to one surface of the said base slice, a second elicit pole electrically connected to the other surface of the said base slice. Outside each of the said two opposite surfaces of the base slice a low-melting-point metal conductor layer is respectively situated, which is melted at the temperature of 155˜450° C., and the two layers are not electrically connected by any good conductor. When the non-burnable varistor base is struck and burned through to form an arc, the low-melting-point metal are melted and go into the arc in the form of gas or liquid, to depress the resistance of the arc nearly to a short estate. So the arc current can be cut off by the over-loading security mechanism as over-current protective fuses or breakers, before the coat of the non-burnable varistor caught on fire, to prevent the occurrence of fire accident. | 10-23-2008 |
20080266045 | THIN FILM VARISTOR ARRAY - A method of forming a thin film varistor array includes creating a metal-metal oxide-metal layer stack without breaking vacuum. The stack is patterned as a plurality of bus lines, each having a plurality of varistor islands formed thereon. | 10-30-2008 |
20080297302 | ON CHIP ZINC OXIDE THIN FILM VARISTOR, FABRICATION METHOD THEREOF AND APPLICATIONS THEREOF - The present invention discloses an on chip zinc oxide thin film varistor, a fabrication method thereof and applications thereof. In the present invention, a zinc oxide-containing film is directly formed on a substrate with a sputtering method, and then the zinc oxide-containing film is processed with a post-annealing treatment to raise the resistance thereof. Thus, an on chip zinc oxide thin film varistor having a superior performance is attained. The fabrication process of the present invention is easy to control and has a high reliability. Further, the fabrication process of the present invention can fully integrate with the semiconductor processes, which benefits the surge protection of semiconductor components. | 12-04-2008 |
20090015367 | NONLINEAR RESISTOR CERAMIC COMPOSITION, ELECTRONIC COMPONENT, AND MULTILAYER CHIP VARISTOR - A nonlinear resistor ceramic composition has a major component containing zinc oxide, a first minor component containing an oxide of a rare-earth metal, a second minor component containing an oxide of Ca, and a third minor component containing an oxide of Si. A percentage of the second minor component to 100 moles of the major component is in the range of 2 atomic % ≦ the second minor component <80 atomic % in terms of Ca. A percentage of the third minor component to 100 moles of the major component is in the range of 1 atomic % ≦ the third minor component <40 atomic % in terms of Si. An atomic ratio of Ca to Si (Ca/Si) is not less than 1. | 01-15-2009 |
20090021341 | VARISTOR - A varistor has a ceramic composition to exhibit nonlinear voltage-current characteristics, and at least two electrodes arranged to sandwich at least a portion of the ceramic composition. The ceramic composition contains a mixture phase in which a first phase containing zinc oxide as a major component, and a second phase comprised of an oxide of Ca and Si are mixed. | 01-22-2009 |
20090027157 | VARISTOR AND ELECTRONIC COMPONENT MODULE USING SAME - A varistor includes a ceramic substrate having an insulating property, a varistor layer provided on the ceramic substrate and mainly containing zinc oxide, a first glass ceramic layer provided on the second surface of the varistor layer, first and second internal electrodes provided in the varistor layer and facing each other. The varistor has a small, thin size, and has sufficient varistor characteristics against surge voltages. The varistor provides a small electronic component module with resistance to static electricity and surge voltages. | 01-29-2009 |
20090045907 | Microvaristor-Based Overvoltage Protection - The disclosure relates to an overvoltage protection means containing ZnO microvaristor particles for protecting electrical elements and a method to produce the means. Single microvaristor particles are placed in an arrangement having a monolayer thickness and are electrically coupled to the electrical element to protect it against overvoltages. Embodiments, among other things, relate to: 1-dimensional or 2-dimensional arrangements of microvaristor particles; placement of single microvaristors on a carrier; the carrier being planar or string-like, being structured, being a sticky tape, having fixation means for fixing the microvaristors, or having electrical coupling means. The monolayered overvoltage protection means allows very tight integration and high flexibility in shaping and adapting it to the electric or electronic element. Furthermore, reduced capacitance and hence reaction times of overvoltage protection are achieved. | 02-19-2009 |
20090079535 | VARISTOR AND VARISTOR APPARATUS - A varistor comprises a main body having first and second external terminals formed on the outer surface thereof, a first withdrawn terminal plate joined to the first external terminal, and a second withdrawn terminal plate joined to the second external terminal, wherein the melting point of a second bonding material for allowing the second withdrawn terminal plate and the second external terminal to be joined to each other is lower than that of a first bonding material for allowing the first withdrawn terminal plate and the first external terminal to be joined to each other. | 03-26-2009 |
20090096569 | Ceramic Component Element And Ceramic Component And Method For The Same - A ceramic component element is provided. The ceramic component element includes: an insulating ceramic base with pores formed on its surface and previously fired; and a functional ceramic sheet bonded to the insulating ceramic base and having electrical characteristics. The functional ceramic sheet is physically bonded to the insulating ceramic base by forming pressing a green sheet for the functional ceramic sheet on the insulating ceramic base at constant temperature and pressure so that parts of the green sheet are forced to put into the pores and anchored, and the functional ceramic sheet is chemically bonded to the insulating ceramic base by firing the anchored green sheet in such a manner that functional oxides of the green sheet penetrate the insulating ceramic base by solid diffusion to form a diffusion bonding layer. | 04-16-2009 |
20090140833 | ELECTRONIC DEVICE AND METHOD - An article is provided that includes a plurality of layers. Each layer includes a sinterable mass having a sinter temperature that is less than about 1000 degrees Celsius, and an inner electrode proximate to the sinterable mass. The inner electrode includes a material having a melting point that is within a determined temperature range of about 10 degrees Celsius to about 200 degrees Celsius relative to the sintering temperature. A method to make the article is also provided. | 06-04-2009 |
20090160600 | VARISTOR - A varistor | 06-25-2009 |
20090189732 | AGGREGATE SUBSTRATE, PRODUCTION METHOD OF AGGREGATE SUBSTRATE, AND VARISTOR - An aggregate substrate has a first varistor part, a second varistor part, and a heat dissipation layer The first varistor part includes a first varistor element layer to exhibit nonlinear voltage-current characteristics, and a plurality of first internal electrodes juxtaposed in the first varistor element layer. The second varistor part includes a second varistor element layer to exhibit nonlinear voltage-current characteristics, and a plurality of second internal electrodes juxtaposed in the second varistor element layer The heat dissipation layer is located between the first and second varistor parts and is in contact with the first and second varistor parts. | 07-30-2009 |
20090231084 | VOLTAGE NON-LINEAR RESISTOR CERAMIC COMPOSITION AND MULTILAYER VARISTOR USING THE SAME - A voltage non-linear resistor ceramic composition has ZnO as a main component and is represented by the general formula (1−x)ZnO+x[Sr | 09-17-2009 |
20090256669 | SUBSTRATE DEVICE OR PACKAGE USING EMBEDDED LAYER OF VOLTAGE SWITCHABLE DIELECTRIC MATERIAL IN A VERTICAL SWITCHING CONFIGURATION - A substrate device includes an embedded layer of VSD material that overlays a conductive element or layer to provide a ground. An electrode, connected to circuit elements that are to be protected, extends into the thickness of the substrate to make contact with the VSD layer. When the circuit elements are operated under normal voltages, the VSD layer is dielectric and not connected to ground. When a transient electrical event occurs on the circuit elements, the VSD layer switches instantly to a conductive state, so that the first electrode is connected to ground. | 10-15-2009 |
20100117782 | VARISTOR - A varistor having a favorable heat-dissipating property is provided. | 05-13-2010 |
20100134235 | ESD PROTECTOR AND METHOD OF MANUFACTURING THE SAME - A pair of thick first electrodes ( | 06-03-2010 |
20100237980 | SURGE ARRESTER - Surge arrester with a module | 09-23-2010 |
20110025450 | VARISTOR HAVING CERAMIC CASE - A varistor for protecting a power circuit from explosion and flaming is disclosed. The varistor includes a surge absorber sintered at a first predetermined temperature and having a plurality of electrodes, a plurality of leads connected to the electrodes respectively, a coating enrobing the surge absorber, and the ceramic case sintered at a second predetermined temperature and housing the surge absorber and the coating. The second predetermined temperature is higher than the first predetermined temperature. The ceramic case has a plurality of openings for the leads to extend outside of the ceramic case. The ceramic case is made from Al | 02-03-2011 |
20110037559 | ELECTRICAL MULTILAYER COMPONENT WITH REDUCED PARASITIC CAPACITANCE - An electrical multi-layer component includes a body having a stack of ceramic layers, with a top and a bottom. First and second connection surfaces are on the bottom of the body. Electrode surfaces are in metallization layers among the ceramic layers. Via contacts are between metallization layers. At least one of the via contacts is connected electrically to an electrode surface or to a connection surface. An electrode surface connected to one of the connection surfaces, through a corresponding via contact, is a first electrode structure or a second electrode structure. At least one of the first or second electrode structures includes a via contact that has a blind end. A shortest distance between the first and second electrode structures is a vertical distance from the blind end to: (i) a metallization layer above or below the blind end, or (ii) a blind end of another electrode structure. | 02-17-2011 |
20120086541 | SOLID-CORE SURGE ARRESTER - A solid-core surge arrester includes a module assembly. The module assembly includes at least one metal oxide varistor (MOV) disk with an outer circumferential surface, and a material applied to the outer circumferential surface. The material includes multiple layers to allow the module assembly to withstand a bending moment under an approximately continuously applied load, and the material is configured to allow venting of gas that forms in the module assembly in a preferential direction. | 04-12-2012 |
20120112872 | SURGE PROTECTION DEVICE USING METAL OXIDE VARISTORS (MOVs) AS THE ACTIVE ENERGY CONTROL MULTIPLE GAP DISCHARGING CHAIN - The present invention may provide a surge protection device, which may include a reference node, first, second, and third nodes, a first arcing section (GAP) coupled between the first and second nodes, and configured to receive a surge voltage from the first node, a first metal oxide varistor (MOV) coupled between the second and reference nodes, and configured to reduce the surge voltage to a first sub-surge voltage at the second node, a second arcing section (GAP) coupled between the second and third nodes, and configured to receive the first sub-surge voltage from the second node, and a second metal oxide varistor (MOV) coupled between the third and reference nodes, and configured to reduce the first sub-surge voltage to a second sub-surge voltage at the third node. | 05-10-2012 |
20120139688 | CHIP VARISTOR AND CHIP VARISTOR MANUFACTURING METHOD - A chip varistor is provided with a varistor section, a plurality of electroconductive sections, and a plurality of terminal electrodes. The varistor section is comprised of a sintered body containing ZnO as a major component and exhibits the nonlinear voltage-current characteristics. The plurality of electroconductive sections are arranged on both sides of the varistor section and each electroconductive section has a first principal surface connected to the varistor section and a second principal surface opposed to the first principal surface. The terminal electrodes are connected to the respective second principal surfaces of the electroconductive sections. | 06-07-2012 |
20120169452 | ESD PROTECTION DEVICE AND MANUFACTURING METHOD THEREFOR - An ESD protection device includes opposed electrodes in a ceramic base material and a discharge auxiliary electrode in contact with each of the opposed electrodes which is arranged so as to provide a bridge from the opposed electrode on one side to the opposed electrode on the other side, the discharge auxiliary electrode includes metallic particles, semiconductor particles, and a vitreous material, and bonding is provided through the vitreous material between the metallic particles, between the semiconductor particles, and between the metallic particles and the semiconductor particles. The metallic particles have an average particle diameter X of about 1.0 μm or more, and the relationship between the thickness Y of the discharge auxiliary electrode and the average particle diameter X of the metallic particles satisfies about 0.5≦Y/X≦ about 3. | 07-05-2012 |
20120256721 | SUBSTRATE DEVICE OR PACKAGE USING EMBEDDED LAYER OF VOLTAGE SWITCHABLE DIELECTRIC MATERIAL IN A VERTICAL SWITCHING CONFIGURATION - A substrate device includes an embedded layer of VSD material that overlays a conductive element or layer to provide a ground. An electrode, connected to circuit elements that are to be protected, extends into the thickness of the substrate to make contact with the VSD layer. When the circuit elements are operated under normal voltages, the VSD layer is dielectric and not connected to ground. When a transient electrical event occurs on the circuit elements, the VSD layer switches instantly to a conductive state, so that the first electrode is connected to ground. | 10-11-2012 |
20120299693 | ESD PROTECTION DEVICE - An ESD protection device includes a ceramic multilayer substrate in which a plurality of ceramic insulating layers are laminated; a first connecting conductor extending through the main surfaces of the insulating layer; a mixture portion extending along a main surface of the insulating layer including the first connecting conductor and connected to the first connecting conductor, the mixture portion including a material dispersed therein, the material including at least one selected from a metal and a semiconductor, a metal and a ceramic, a semiconductor and a ceramic, a semiconductor, and a metal coated with an inorganic material; and a second connecting conductor that has electrical conductivity and is connected to the mixture portion and extends along the main surface of the insulating layer on which the mixture portion is provided. | 11-29-2012 |
20130015942 | SuppressorAANM JEONG; Jun-HwanAACI IncheonAACO KRAAGP JEONG; Jun-Hwan Incheon KRAANM LEE; Seung-ChulAACI IncheonAACO KRAAGP LEE; Seung-Chul Incheon KRAANM CHUNG; Yeon-SooAACI IncheonAACO KRAAGP CHUNG; Yeon-Soo Incheon KRAANM YOON; Gug-HoAACI Gyeonggi-doAACO KRAAGP YOON; Gug-Ho Gyeonggi-do KR - This invention relates to a suppressor, including an element having sheets printed with a first internal electrode and a second internal electrode, and a discharge material disposed in a gap between the first internal electrode and the second internal electrode, wherein the discharge material is composed of a SiC—ZnO-based component, in which ZnO is reacted with the surface of SiC, thereby imparting much higher insulating properties and improving ESD resistance. | 01-17-2013 |
20130021133 | VARISTOR AND METHOD FOR MANUFACTURING VARISTOR - A varistor is provided with a varistor element body, a plurality of internal electrodes arranged in the varistor element body so as to sandwich a partial region of the varistor element body between them, and a plurality of external electrodes arranged on the surface of the varistor element body and connected to the corresponding internal electrodes. The external electrode has a sintered electrode layer formed by attaching an electroconductive paste containing an alkali metal to the surface of the varistor element body and sintering it. The varistor element body has a high-resistance region formed by diffusing the alkali metal in the electroconductive paste into the varistor element body from an interface between the surface of the varistor element body and the sintered electrode layer. | 01-24-2013 |
20130141208 | Component - A component includes a component body and a contact-connection element composed of sheet metal having a contact region, which has an outer contour line and at least one hole. The contact region is arranged on a side of the component body having a side edge and the outer contour line has straight regions running along straight regions of the side edge. The straight regions of the outer contour line are connected by rounded corners. | 06-06-2013 |
20130154789 | High Amperage Surge Arresters - A high-voltage surge arrester includes an electrically conductive first terminal and an electrically conductive second terminal longitudinally spaced from the first terminal. A plurality of metal oxide varistor (MOV) bars are included, each of which extends from the first terminal to the second terminal and electrically contacts the first terminal and the second terminal. A heat conducting material contacts the MOV bars. | 06-20-2013 |
20130162388 | SURFACE MOUNTING VARISTOR - A surface mounting varistor for high voltages and current pulses without any risk of burning a mounting board is provided. A covering material for a varistor | 06-27-2013 |
20130169405 | NON-LINEAR RESISTIVE ELEMENT AND MANUFACTURING METHOD THEREOF - Provided is a technique to secure compositional or microstructural uniformity of a ceramic sintered body while increasing the area of the ceramic sintered boy, thus improving basic performance including non-linearity, maximum withstand energy and aging characteristics. A plurality of small varistor pieces 11 and insulating resin are kneaded and extruded for shaping, whereby a sheet-form varistor layer 13 can be formed where a plurality of small varistor pieces 11 are spaced from one another and are aligned on the same plane, and the adjacent small varistor pieces 11 are bonded via insulating resin. | 07-04-2013 |
20130200986 | VARISTOR FUSE ELEMENT - The purpose of the invention is to create such a varistor fuse element, which should within a single housing include both a varistor ( | 08-08-2013 |
20130335189 | COMPONENT WITH COUNTERMEASURE AGAINST STATIC ELECTRICITY AND METHOD OF MANUFACTURING SAME - An electrostatic discharge (ESD) protector includes a first high heat-conductive substrate, a second high heat-conductive substrate, a varistor layer, and a plurality of via-hole electrodes. The first high heat-conductive substrate is provided with a plurality of first through-holes. The second high heat-conductive substrate is provided with a plurality of second through-holes. The varistor layer that is mainly composed of zinc oxide is disposed between the first high heat-conductive substrate and the second high heat-conductive substrate. The varistor layer includes internal electrodes. Each of via-hole electrodes penetrates the varistor layer and fills both one of the first through-holes and one of the second through-holes to couple both the ones to each other. | 12-19-2013 |
20140085043 | NON-LINEAR RESISTIVE ELEMENT - Provided is a non-linear resistive element which enables to narrow an interval between a plurality of electrodes. A ceramic sheet ( | 03-27-2014 |
20140167909 | CHIP VARISTOR - An element body has first and second faces opposed to each other. A first conductor has one end exposed in a first face and the other end located in the element body. The second conductor has one end exposed in a second face and the other end located in the element body. The element body has a first element body section having the nonlinear voltage-current characteristics and a second element body section in which an electric current is more likely to flow than in the first element body section. The first element body section is located at least in part between the first conductor and the second conductor, in a direction in which the first conductor and the second conductor are separated from each other. The other end of the first conductor and the other end of the second conductor are located in the second element body section. | 06-19-2014 |
20150294769 | ZINC OXIDE BASED VARISTOR AND FABRICATION METHOD - A varistor may include a varistor ceramic that includes zinc oxide having a molar percent greater than 90 percent and a set of metal oxides, where the set of metal oxides includes Bi | 10-15-2015 |
20150340134 | VOLTAGE SURGE PROTECTOR HAVING A PRESSURE RELEASE MECHANISM - A voltage surge protector consisting of a plurality of varistors connected in a column, an upper electrode connected to the upper edge of the column of varistors, a lower electrode connected to the lower edge of the column of varistors, an insulating housing that surrounds the column of varistors, a fiberglass cover that surrounds the insulating housing and a weatherproof protective cover provided with barriers mounted on the fiberglass cover. The protector has a mechanism to release pressure during a voltage surge, which consists of a hole in a transversal direction for each varistor of the column of varistors inside the insulating housing, the holes being helicoidally distributed along the length of the housing of insulating material and of a depth less than the thickness of the insulating housing. | 11-26-2015 |
20160027603 | VARISTOR FITTED WITH DEGRADATION ALARM - A varistor provided with a degradation alarm function includes a first resistance element, an indicating element coupled in series with the first resistance element, a first thermal fuse coupled in parallel with a pair of the first resistance element and the indicating element, a varistor element coupled in parallel with the first thermal fuse, and a second resistance element disposed in an interconnect line between the first thermal fuse and the varistor element. A fusing temperature of the first thermal fuse is set such that the fuse is blown out at temperatures not lower than a temperature increased by heating when a current larger by a certain value than the maximum current rating of the varistor element passes through the fuse. The second resistance element is larger in resistance than the first resistance element. | 01-28-2016 |
20160055945 | BARREL-SHAPED FIREPROOF AND EXPLOSION-PROOF SURGE PROTECTION DEVICE WITH OVER-TEMPERATURE PROTECTION FUNCTION - The invention provides a barrel-shaped fireproof and explosion-proof surge protection device with the function of over-temperature protection, comprising a barrel-shaped housing, a barrel-shaped varistor and a cylindrical temperature protector, wherein the barrel-shaped housing houses the outer wall of the barrel-shaped varistor, the barrel-shaped varistor comprises a barrel-shaped varistor chip, an outer electrode, and an inner electrode, wherein the outer electrode is connected with an outer pin while the inner electrode is connected with an inner pin, the cylindrical temperature protector is arranged in the barrel space of the barrel-shaped varistor and is provided with two leading foots which are led out independently, or one of which is connected with the inner electrode of the barrel-shaped varistor and is led out, or one of which is connected with the inner electrode of the barrel-shaped varistor but is not led out. | 02-25-2016 |
20160086699 | ELECTRODE COMPONENT AND METHOD FOR FABRICATING THE SAME - An electrode component includes a ceramic substrate, two electrode layers formed on two opposite surfaces of the ceramic substrate, two pins respectively connected to the two electrode layers, and an insulating layer enclosing the ceramic substrate, the electrode layers and a portion of each pin. Each electrode layer is formed of two or more base metal materials or alloys thereof, and the concentrations of the base metal materials progressively vary across the electrode layer. Accordingly, the production cost is lowered, environmental pollution caused by evaporation and thermal dissolution of organic solvent can be prevented, risk of separable electrode interface at high-voltage discharge is mitigated, and the fabrication process of the electrode layer is shortened while maintaining bonding strength between the electrode layers and the ceramic substrate and solderability between the electrode layers and the pins. | 03-24-2016 |
20160125983 | VARISTOR DEVICE - A varistor device includes a main body, a conductive area, a specific-melting-point metallic pin, and an elastic unit. The main body has a first surface, and the conductive area is located at the first surface. The specific-melting-point metallic pin has a first section and a second section. The first section and the second section are one-piece formed. The first section is fixedly disposed on the conductive area. The second section has a specific melting point such that the second section melts when a current flows between the first surface and the second section so as to expose the second section to a temperature greater than the specific melting point. The elastic unit has an end connected to the second section, and the elastic unit provides an elastic force to the second section to break the second section so as to cut off the current when the second section melts. | 05-05-2016 |
20160148728 | Multi-terminal Surge Arrester - A multi-terminal surge arrester which includes an active part extending along a longitudinal direction of the surge arrester, a first electrode resting against a first end of the active part, and a second electrode resting against a second end of the active part, which second end opposes the first end in the longitudinal direction of the surge arrester. The surge arrester further includes an insulating fixing device mechanically connecting and fixing the first electrode and the second electrode, and an insulating housing arranged around the active part. The active part includes at least two metal-oxide based varistor elements and a further electrode arranged between the at least two varistor elements, which further electrode provides an externally accessible electrical connection. Therein, the surge arrester is adapted for being insulated by surrounding air. | 05-26-2016 |
20160177074 | RESIN MATERIAL HAVING NON-OHMIC PROPERTIES, METHOD FOR PRODUCING SAME, AND NON-OHMIC RESISTOR USING SAID RESIN MATERIAL | 06-23-2016 |
20160379739 | VOLTAGE NONLINEAR RESISTOR CERAMIC AND ELECTRONIC COMPONENT - A voltage nonlinear resistor ceramic comprises: a Zn oxide; a Co oxide; an R (specific rare earth) oxide; a Cr oxide; an M1 (Ca, Sr) oxide; an M2 (Al, Ga, In) oxide; and strontium titanate. When content of the Zn oxide is assumed to be 100 mole portion in terms of Zn, content of the Co oxide is 0.30 to 10 mole portion in terms of Co, content of the R oxide is 0.10 to 10 mole portion in terms of R, content of the Cr oxide is 0.01 to 2 mole portion in terms of Cr, content of the M1 oxide is 0.10 to 5 mole portion in terms of M1, content of the M2 oxide is 0.0005 to 5 mole portion in terms of M2, and content of the strontium titanate is 0.10 to 5 mole portion in terms of SrTiO | 12-29-2016 |