Crystal Structure Analysis of High TC Barium Titanate – Bismuth Perovskite-Type Oxide System Ceramics and their Piezoelectric Property

Abstract:

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Barium titanate (BaTiO3, BT) – bismuth titanate magnesium oxide (Bi(Mg0.5Ti0.5)O3, BMT) solid solution system ceramics were prepared by conventional sintering method in pursuit of the enhancement of the BT Curie temperature (TC, 132 °C). 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.

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Periodical:

Edited by:

Shinobu Fujihara and Tadashi Takenaka

Pages:

23-26

DOI:

10.4028/www.scientific.net/KEM.445.23

Citation:

K. Yamato et al., "Crystal Structure Analysis of High TC Barium Titanate – Bismuth Perovskite-Type Oxide System Ceramics and their Piezoelectric Property", Key Engineering Materials, Vol. 445, pp. 23-26, 2010

Online since:

July 2010

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$35.00

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