Effect of BaCO3 and Pb3O4 on Properties of BaTiO3-Based PTCR Ceramics
High-performance PTCR ceramics with low resistivity (8Ω.cm) at room temperature and around four orders magnitude of the PTCR jump were obtained by adding BaCO3 and Pb3O4(B-P) in BaTiO3. The influence of adding B-P on the sintering behavior, the microstructure and the electrical properties of BaTiO3-based PTCR was investigated. The phase constituent in the sintered ceramics was analyzed by XRD and it was shown that the metallic layered Ba3Pb2O7 phase was synthesized during the sintering. Analysis suggested that making the weak reduction atmosphere at the grain boundary may decrease the grain-boundary resistivity.
Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li
W. B. Ma et al., "Effect of BaCO3 and Pb3O4 on Properties of BaTiO3-Based PTCR Ceramics", Key Engineering Materials, Vols. 280-283, pp. 349-352, 2005