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Effects of simultaneous addition of BN and Bi2O3 on the microstructure and the PTCR characteristic in Ba0.4Pb0.6 TiO3 ceramics were studied. Different effects of addition were observed depending on the element (Sb or La) used for making the materials semiconductive. Stable PTCR characteristics with room temperature resistivities of less than 10ƒ¶• cm and a resis tivity jump of more than 103 were obtained for the materials containing 0.04 to 0.10mol% Bi2O3. These materials were characterized by twofold microstructures, in which large grains were surrounded by small ones. [Received May 24, 1989; Accepted June 23, 1989]

nihon seramikkusu kyoukai gakujyutsu rombunshi/nippon seramikkusu kyōkai gakujutsu rombunshi

Influence of the Addition of BN and Bi&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; on the Microstructure and the PTCR Effect in High-Curie-Point Barium-Lead Titanate Ceramics