发明名称 |
SEMICONDUCTOR CERAMIC AND POSITIVE TEMPERATURE COEFFICIENT THERMISTOR |
摘要 |
<p>A semiconductor ceramic of the present invention includes a Ba m TiO 3 -based composition, as a main component, having a perovskite structure represented by general formula A m BO 3 , wherein part of Ba constituting an A site is replaced with Na, Bi, Ca, and a rare-earth element having an ionic radius smaller than that of the Na; the content of the rare-earth element when the total number of moles of the elements constituting the A site is 1 mole is 0.0005 to 0.015 on a molar ratio basis; and the content of the Ca when the total number of moles of the elements constituting the A site is 1 mole is 0.05 to 0.20 (preferably 0.125 or more and 0.175 or less) on a molar ratio basis. A PTC thermistor includes a component body 1 formed of the semiconductor ceramic. Accordingly, high reliability is achieved even if an alkali metal element is contained.</p> |
申请公布号 |
EP2377837(A1) |
申请公布日期 |
2011.10.19 |
申请号 |
EP20090831971 |
申请日期 |
2009.12.11 |
申请人 |
MURATA MANUFACTURING CO., LTD. |
发明人 |
ABE, NAOAKI;KATSU, HAYATO;GOTO, MASATO;KISHIMOTO, ATSUSHI;NAKAYAMA, AKINORI |
分类号 |
C04B35/46;H01C7/02 |
主分类号 |
C04B35/46 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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