Influence of Grain Boundaries on the Properties of Sr0.4Pb0.6TiO3 Thermistors

Abstract

Abstract: A kind of V-shaped thermistor based on Sr_0.4Pb_0.6TiO₃ materials was fabricated by solid
state reaction methods. The samples exhibit novel NTCR effect below the Curie temperature (T_c) and typical PTCR effect above T_c, the room-
temperature resistivities and the values of log(ρ_25℃/ρ_min) increase with elevating soaking temperature. The phase structure, microstructure
and compositional distribution of samples were investigated by using XRD, SEM and EDS respectively. The results show that Sr, Ti
concentrations near the grian boundaries are higher than that in the grains. It is estimated that the NTCR effects of (Sr,Pb)TiO₃
ceramics are closely related to the Pb²⁺ ionic vacancies near the grain boundaries. The semiconductive mechanism of Y³⁺-doped
(Sr,Pb)TiO₃ ceramics was also discussed.

Key words: (Sr, Pb）TiO₃, PTCR, NTCR

CLC Number:

TN373

ZHAO Jing-Chang,LI Long-Tu,GUI Zhi-Lun. Influence of Grain Boundaries on the Properties of Sr_0.4Pb_0.6TiO₃ Thermistors[J]. Journal of Inorganic Materials.

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Influence of Grain Boundaries on the Properties of Sr_0.4Pb_0.6TiO₃ Thermistors

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