Effect of BiYbO3 Solid Solution Limit on Electric Properties and Structure of BSPT Piezoceramics

doi:10.3724/SP.J.1077.2013.12476

Abstract

Abstract: yBiYbO₃-(0.36–y)BiScO₃-xPbTiO₃ (BSYPT-0.64/y) piezoelectric ceramics were prepared by traditional solid reaction method. The result of X-ray diffraction shows that the as-prepared BSYPT-0.64/y ceramics have single perovskite structure. However, scanning electron microscopy results show that the surface morphology of BSYPT-0.64/y ceramics becomes abnormal at y=0.1, and a large amount of tiny grains, with the grain size distributing from 0.3 μm to 0.5 μm, separate out on the surface of the ceramics at y=0.14. EDS analysis reveals that the major ingredients of these tiny grains are mainly Bi, Yb, Ti, Sc and O. The solid solution limit is therefore confirmed to be near y=0.1 for the BSYPT-0.64/y ceramics. By means of systematic piezoelectric, ferroelectric and temperature-dependent dielectric (T_c~450℃) characterizations, it is found that the occurrence of solid solubility limit-related BiYbO₃ separation is not a key factor for affecting the electrical properties and structure of the ceramics, but a relatively isolated behavior. The degradation of structural and electrical properties is attributed to the decrease in Sc/Pb ratio when the BiYbO₃ content is increased, which leads to a deviation from MPB in the BSYPT-0.64/y ceramics.

Key words: solid solution limit, piezoelectric ceramics, Curie temperature, ferroelectric propert

CLC Number:

TB34

SHI Wei, LENG Sen-Lin, LONG Yu, ZHU Jian-Guo, XIAO Ding-Quan. Effect of BiYbO₃ Solid Solution Limit on Electric Properties and Structure of BSPT Piezoceramics[J]. Journal of Inorganic Materials, 2013, 28(06): 623-628.

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Effect of BiYbO₃ Solid Solution Limit on Electric Properties and Structure of BSPT Piezoceramics

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