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Phase transition behaviors of BaTiO3–BaZrO3 solid solutions under high direct current bias fields

Published online by Cambridge University Press:  31 January 2011

S. Wada ,
H. Adachi ,
H. Kakemoto ,
H. Chazono ,
Y. Mizuno ,
H. Kishi  and
T. Tsurumi
S. Wada*
Affiliation:
Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2–12–1 Ookayama, Meguro-ku, Tokyo 152–8552, Japan
H. Adachi
Affiliation:
Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2–12–1 Ookayama, Meguro-ku, Tokyo 152–8552, Japan
H. Kakemoto
Affiliation:
Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2–12–1 Ookayama, Meguro-ku, Tokyo 152–8552, Japan
H. Chazono
Affiliation:
General R & Laboratories, Taiyo Yuden Co., Ltd., 5607–2 Nakamuroda, Haruna-machi, Gunma 370–3347, Japan
Y. Mizuno
Affiliation:
General R & Laboratories, Taiyo Yuden Co., Ltd., 5607–2 Nakamuroda, Haruna-machi, Gunma 370–3347, Japan
H. Kishi
Affiliation:
General R & Laboratories, Taiyo Yuden Co., Ltd., 5607–2 Nakamuroda, Haruna-machi, Gunma 370–3347, Japan
T. Tsurumi
Affiliation:
Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2–12–1 Ookayama, Meguro-ku, Tokyo 152–8552, Japan
*
a) Address all correspondence to this author. e-mail: swada@ceram.titech.ac.jp
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Abstract

The dielectric properties of the Ba(Ti1–xZrx)O3 (BT1–xZx) ceramics with various compositions were investigated under various DC bias fields. In BT0.94Z0.06 ceramics, the dielectric constants (ε) vs temperature (T) curves without DC bias showed no frequency dependence. Its DC bias dependence exhibited that with increasing DC bias fields, the dielectric constants were suppressed while phase transition peaks slightly shifted to high temperature. In BT0.58Z0.42 ceramics, the ε vs T curves without DC bias showed a broad peak with a clear frequency dependence, which revealed that BT0.58Z0.42 ceramics were the relaxor. Its DC bias dependence exhibited that with increasing DC bias fields, the dielectric constants were suppressed while the phase transition peak largely shifted to low temperatures. In BT0.79Z0.21 ceramics, the ε vs T curves without DC bias showed a broad peak without frequency dependence. Its DC bias dependence revealed that the dielectric peak shifted to high temperature and broadened with increasing DC bias. To explain the above phenomena, it was considered that the role of Zr ions on BT1−xZx ceramics is to make the depth of the potential well shallow successively.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 2 , February 2002 , pp. 456 - 464
Copyright
Copyright © Materials Research Society 2002

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