Open AccessPiezoelectric properties of high Curie temperature barium titanate–bismuth perovskite-type oxide system ceramics
Author(s) -
Satoshi Wada,
Keisuke Yamato,
Petr Půlpán,
Nobuhiro Kumada,
Bong-Yeon Lee,
Takashi Iijima,
Chikako Moriyoshi,
Yoshihiro Kuroiwa
Publication year - 2010
Publication title -
journal of applied physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.699
H-Index - 319
eISSN - 1089-7550
pISSN - 0021-8979
DOI - 10.1063/1.3481390
Subject(s) - curie temperature , materials science , barium titanate , ceramic , dielectric , perovskite (structure) , bismuth , bismuth titanate , piezoelectricity , mineralogy , analytical chemistry (journal) , ferroelectricity , composite material , metallurgy , condensed matter physics , crystallography , chemistry , optoelectronics , physics , chromatography , ferromagnetism
Barium titanate (BaTiO3, BT)—bismuth magnesium titanium oxide [Bi(Mg0.5Ti0.5)O3, BMT] system ceramics were prepared in an ambient atmosphere in order to increase the Curie temperature (Tc) of BT above 132 °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 °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 Tc piezoelectric applications.
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