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Ferroelectrics Volume 346, 2007 - Issue 1
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Original Articles

Investigation of Phase Transition Temperatures on (Bi1/2Na1/2)TiO3-(Bi1/2K1/2)TiO3 and (Bi1/2Na1/2)TiO3-BaTiO3 Lead-free Piezoelectric Ceramics by Electrical Measurements

Yuji Hiruma Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba-ken, 278-8510, Japan
,
Kazushige Yoshii Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba-ken, 278-8510, Japan
,
Hajime Nagata Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba-ken, 278-8510, Japan
&
Tadashi Takenaka Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba-ken, 278-8510, Japan
Pages 114-119 | Received 15 May 2006, Published online: 29 Mar 2007
 
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Abstract

Phase transition temperatures of (1-x)(Bi1/2Na1/2)TiO3—x (Bi1/2K1/2)TiO3 (BNKTx) and (1-x)(Bi1/2Na1/2) TiO3—xBaTiO3 (BNBTx) ceramics were investigated by using electrical measurements such as dielectric and piezoelectric properties. We discussed how to determine the depolarization temperature, Td, and rhombohedral-tetragonal phase transition, TR−T, for (Bi1/2Na1/2) TiO3 (BNT)-based solid solutions, and the Td TR−T and the temperature that dielectric constant become maximum Tm, for BNKTx and BNBTx were clarified in this study.

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