Piezoelectric properties of high Curie temperature barium titanate-bismuth perovskite-type oxide system ceramics

Wada Satoshi

Yamato Keisuke

Pulpan Petr

Kumada Nobuhiro

Lee Bong-Yeon

Iijima Takashi

Moriyoshi Chikako

Kuroiwa Yoshihiro

Journal of Applied Physics

Barium titanate (BaTiO3, BT)-bismuth magnesium titanium oxide [Bi(Mg0.5Ti0.5)O-3, BMT] system ceramics were prepared in an ambient atmosphere in order to increase the Curie temperature (T-c) of BT above 132 degrees C. A single perovskite phase was observed for BT-BMT ceramics with BMT compositions less than 50 mol %, and their relative densities were greater than 94%. Synchrotron measured x-ray diffraction patterns revealed that all the cations in the ceramics were homogeneously distributed. The temperature dependence of the dielectric properties revealed that the BT-BMT system ceramics exhibited relaxorlike characteristics with a dielectric maximum temperature as high as 360 degrees C for the 0.5BT-0.5BMT ceramic. The apparent piezoelectric constant (d*) was 60 pC/N for the 0.4BT-0.6BMT ceramic. Based upon these results, the BT-BMT system shows potential as a new type of lead-free material for high T-c piezoelectric applications.

Physics [ 420 ]

eng

The American Institute of Physics

Copyright (c) 2010 American Institute of Physics

[ISSN] 0021-8979

[DOI] 10.1063/1.3481390

[NCID] AA00693547

[DOI] http://dx.doi.org/10.1063/1.3481390