首页|Crystal Structure Analysis of High T_C Barium Titanate - Bismuth Perovskite-type Oxide System Ceramics and Their Piezoelectric Property

Crystal Structure Analysis of High T_C Barium Titanate - Bismuth Perovskite-type Oxide System Ceramics and Their Piezoelectric Property

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  • Trans Tech Publications Ltd
Barium titanate (BaTiO_3, BT) - bismuth titanate magnesium oxide (Bi(Mg_(0.5)Ti_(0.5))O_3, BMT) solid solution system ceramics were prepared by conventional sintering method in pursuit of the enhancement of the BT Curie temperature (T_C, 132 ℃). Normal ferroelectric polarization vs. electric-field (P-E) hysteresis loops were observed for BT-BMT ceramics with BMT contents below 20 and above 60 molar%. On the other hand, broad P-E double hysteresis loops were observed for BMT contents from 30 to 50 molar%. The origin was investigated using synchrotron XRD measurement and Rietveld analysis. The crystal structure was assigned to ferroelectric phase with domain-pinning by certain defect structures. A modified phase diagram was proposed on the basis of the temperature dependence of the crystal structure.

barium titanatebismuth perovskite-type oxidepiezoelectric propertycrystal structurelead-free ceramics

Keisuke Yamato、Nobuhiro Kumada、Petr Pulpan、Satoshi Ohno、Chikako Moriyoshi、Yoshihiro Kuroiwa、Bong-Yeon Lee、Takashi Iijima、Satoshi Wada

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Material Science and Technology, Interdisciplinary Graduate School of Medical and Engineering, University of Yamanashi, 4-4-37 Takeda, Kofu, Yamanashi 400-8510, Japan

Department of Physical Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan

National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 5, Tsukuba, Ibaraki 305-8565, Japan

2010

10.4028/www.scientific.net/KEM.445.23

Key engineering materials

Key engineering materials

ISSN：1013-9826
年,卷(期)：2010.445
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