SEMICONDUCTOR CERAMIC AND POSITIVE TEMPERATURE COEFFICIENT THERMISTOR

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 . Part of Ba constituting an A site is replaced with at least an alkali metal element, Bi, and a rare-earth element, a...

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Bibliographic Details
Main Authors NAKAYAMA AKINORI, ABE NAOAKI, GOTO MASATO, KATSU HAYATO, KISHIMOTO ATSUSHI
Format Patent
LanguageEnglish
French
German
Published 05.10.2011
Subjects
ARTIFICIAL STONE
BASIC ELECTRIC ELEMENTS
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
ELECTRICITY
LIME, MAGNESIA
METALLURGY
REFRACTORIES
RESISTORS
SLAG
TREATMENT OF NATURAL STONE
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Summary: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 . Part of Ba constituting an A site is replaced with at least an alkali metal element, Bi, and a rare-earth element, and the molar ratio m between the A site and a B site is 0. 990 ‰¤ m ‰¤ 0.999 (preferably 0.990 ‰¤ m ‰¤ 0.995). Preferably part of the Ba is replaced with Ca, and the content of the Ca when the total number of moles of the elements constituting the A site is 1 mole is 0.042 to 0.20 (preferably 0.125 to 0.175) on a molar ratio basis. A PTC thermistor includes a component body 1 formed of the semiconductor ceramic. Accordingly, there are provided satisfactory rise characteristics even if an alkali metal element is contained.
Bibliography:Application Number: EP20090831969