Grain-size effects on dielectric properties in barium titanate ceramics

Journal of Applied Physics - Tập 47 Số 1 - Trang 371-373 - 1976
Kyôichi Kinoshita1, Akihiko Yamaji1
1Ibaraki Electrical Communication Laboratory, Nippon Telegraph and Telephone Public Corporation, Tokai, Ibaraki, (Japan)

Tóm tắt

Measurements of the dielectric constant κ in high-purity BaTiO3 ceramics as a function of temperature show that κ is quite dependent on grain size in the ferroelectric state while it is almost independent of grain size in the paraelectric state. In the ferroelectric orthorhombic and rhombohedral phases, κ decreases rapidly with lowering temperature when grain size is reduced smaller than 3 μm. It is also observed that the Curie temperature Tc is decreased very slightly, but the lower two transition points are shifted to higher temperatures as grain size decreases.

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Tài liệu tham khảo

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Thông tin xuất bản

Journal of Applied Physics

Tập 47 Số 1

371-373

Thông tin tác giả