Large electrostriction near the solubility limit in BaTiO3–CaTiO3 ceramics

Wang, Xusheng; Yamada, Hiroshi; Xu, Chao-Nan
January 2005
Applied Physics Letters;1/10/2005, Vol. 86 Issue 2, p022905
Academic Journal
This study prepared (1-x)BaTiO3–xCaTiO3 (x=0.20–1.0) ceramics. Their structural and electric properties were analyzed. High electrostrictive strain of 0.22%, higher by 157% as compared to BaTiO3 ceramic, was obtained near the solubility limit in the side of composite (x=0.23), which is a diphasic ceramic composed of a ferroelectric tetragonal Ba0.8Ca0.2TiO3 solid solution and a normal dielectric orthorhombic Ba0.07Ca0.93TiO3 solid solution. This enhanced electrostriction resulted from the coupling of the large ionic polarization in Ba0.07Ca0.93TiO3 with the non-180° domains in Ba0.8Ca0.2TiO3 during the external electric field exertion.


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