- 著者
-
Kobune Masafumi
Teraoka Kenji
Nishioka Hiroshi
Yamaguchi Hideshi
Honda Koichiro
- 出版者
- Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physics
- 雑誌
- Jpn J Appl Phys (ISSN:00214922)
- 巻号頁・発行日
- vol.50, no.9, pp.09ND08-09ND08-5, 2011-09-25
- 被引用文献数
-
7
Perovskite-structured solid solutions with compositions of 0.9963{($1-x$)(Bi<sub>1/2</sub>Na<sub>1/2</sub>)TiO<sub>3</sub>--$x$Ba(Cu<sub>1.1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>} + 0.0037MnO<sub>2</sub>, with $x = 0{\mbox{--}}0.06$ [abbreviated as ($1-x$)BNT--$x$BCN)], were fabricated by normal sintering, and their structural, and piezo- and ferroelectric properties were investigated in detail. The X-ray diffraction profiles of the ($1-x$)BNT--$x$BCN solid solutions with $x = 0{\mbox{--}}0.06$ suggested that the rhombohedral-tetragonal morphotropic phase boundary (MPB) in this material system is in the compositional region $x = 0.0425{\mbox{--}}0.0460$. The cross-sectional transmission electron microscopy (TEM) images and selected-area electron diffraction (SAED) patterns of the ($1-x$)BNT--$x$BCN samples with $x = 0.0475$ suggested that the present materials have a modulation structure arranged by a double period along the [111] direction. It is shown that the tetragonal BNT--BCN ($x = 0.0475$) solid solution with a composition of 0.9490BNT$\Cdot$0.0473BCN$\Cdot$0.0037MnO<sub>2</sub>near the MPB has a piezoelectric coefficient ($d_{33}$), a relative permittivity ($\varepsilon_{33}{}^{\text{T}}/\varepsilon_{0}$), and a remanent polarization ($P_{\text{r}}$) of approximately 1.8, 3.2, and 2.8 times larger, respectively, than those of the BNT solid solution without BCN substitution.