Structural and piezoelectric properties of high-density (Bi0.5K0.5)TiO3–BiFeO3 ceramics

Journal of Applied Physics - Tập 108 Số 10 - 2010
Hiroki Matsuo1, Yuji Noguchi1, Masaru Miyayama1, Muneyasu Suzuki2, Akira Watanabe3, Shuji Sasabe3, Tomoatsu Ozaki4, Shigeo Mori4, Shuki Torii5, Takashi Kamiyama5
1The University of Tokyo 1 Research Center for Advanced Science and Technology, , 4-6-1 Komaba, Meguro-Ku, Tokyo 153-8904, Japan
2National Institute of Advanced Industrial Science and Technology (AIST) 2 Advanced Manufacturing Research Institute, , AIST Tsukuba East 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan
3Hosokawa Micron Corporation 3 , 1-9, Tajika, Shoudai, Hirakata-shi, Osaka 573-1132, Japan
4Osaka Prefecture University 4 Department of Materials Science, , Gakuen-cho 1-1, Sakai, Osaka 599-8531, Japan
5High Energy Accelerator Research Organization 5 , 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan

Tóm tắt

The crystal structures and dielectric, polarization, and piezoelectric properties of high-density x(Bi0.5K0.5)TiO3–(1−x)BiFeO3 ceramics were investigated. The results obtained using x-ray and neutron powder diffractions and transmission electron microscopy showed that a morphotropic phase boundary between the rhombohedral (ferroelectric) and pseudocubic (ferroelectric) phases is present in 0.4<x<0.43. Ceramics with x=0.4 exhibited a large remanent polarization of 52 μC/cm2 at 25 °C and their piezoelectric properties were maintained up to 300 °C. It is suggested that the presence of nanosized domains with a polar rhombohedral structure observed for x=0.4 is the origin of relaxor-like dielectric properties.

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Journal of Applied Physics

Tập 108 Số 10

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