Structure and Dielectric Properties of (Sr,Ca)TiO3 Ceramics

Abstract

Abstract: The phase component, structure and dielectric properties of (Sr,Ca)TiO₃ systems were studied. When ST/CT
ratio is 7:3, a main crystalline phase (Sr_0.7Ca_0.3)TiO₃ complete solid solution with the ABO_₃ perovskite structure is formed,
the dielectric properties are improved by a microscale next crystalline phase BNT(Ba₆Ti₂Nb₈O₃₀) with the tungsten bronze structure
in the system. The new ceramic materials with excellent dielectric properties (ε_{(20℃ 1MHZ)}≥250, α_{c(-55～+125℃)}=-1150ppm/℃, tgδ_{(20℃ 1MHZ)}<5×10^-4, ρ_{v(20℃ 100VDC)}≥10¹³Ω·cm) do not contain lead or bismuth , and can be used for Q group multilayer ceramic capacitors.

Key words: strontium-calcium titante, barium titanium niobate, structure, dielectric properties

CLC Number:

TM534

LIU Yue-Hui,CHEN Xu-Ming. Structure and Dielectric Properties of (Sr,Ca)TiO₃ Ceramics[J]. Journal of Inorganic Materials.

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Structure and Dielectric Properties of (Sr,Ca)TiO₃ Ceramics

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