Structure, Dielectric and Crystal Chemistry Properties of Bi1.5-xCaxZnNb1.5O7 Ceramics

doi:10.3724/SP.J.1077.2012.12033

Abstract

Abstract: Bi_1.5-xCa_xZnNb_1.5O₇(0.00≤x≤0.50, BCZN) ceramics were prepared by solid phase reaction. The effects of Ca²⁺ substituting Bi³⁺ on the sintering properties, microstructure, dielectric and crystal chemistry properties of Bi_1.5ZnNb_1.5O₇ based ceramics were investigated. The results revealed that when x≤0.25 mol, crystal structure of Bi_1.5-xCa_xZnNb_1.5O₇ ceramics via X-ray diffraction(XRD) was pure α-BZN phase. With the amount of Ca²⁺ ion increasing, the sintering temperature increased from 1000℃ to 1020℃, the density decreased from 7.011 g/cm³ to 6.353 g/cm³; and the grain size, lattice constant, resistivity all gradually decreased. For the crystal chemistry parameters, with the amount of Ca²⁺ ion increasing, AV(O')[Bi₄], AV(O')[Bi₃Zn], AV(O')[Bi₂Zn₂], AV(O')[Ca₃Zn] all gradually increased, which coincided with the changes of lattice constant and dielectric properties.

Key words: Bi_1.5-xCa_xZnNb_1.5O₇ ceramics, lattice constant, dielectric properties, bond valence theory

CLC Number:

TQ174

WANG Hong-Ni, DING Shi-Hua, SONG Tian-Xiu, TU Wei, ZHANG Jing. Structure, Dielectric and Crystal Chemistry Properties of Bi_1.5-xCa_xZnNb_1.5O₇ Ceramics[J]. Journal of Inorganic Materials, 2012, 27(11): 1164-1168.

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Structure, Dielectric and Crystal Chemistry Properties of Bi_1.5-xCa_xZnNb_1.5O₇ Ceramics

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