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Preparation and Properties of Sm2O3 Doped (Ba0.7Ca0.3)TiO3-Ba(Zr0.2Ti0.8)O3 Lead-free Piezoelectric Ceramics

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Author(s): CUI Ye-Rang, LIU Xin-Yu, YUAN Chang-Lai, ZHAI Xia, HU Yao-Bin, LI Ruo-Wen

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 27;
Issue: 7;
Start page: 731;
Date: 2012;
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Keywords: lead-free piezoelectric ceramics; Sm2O3; piezoelectric property; perovskite

ABSTRACT
Sm2O3 doped (Ba0.7Ca0.3)TiO3-Ba(Zr0.2Ti0.8)O3 (BCZT) lead-free piezoelectric ceramics were prepared by solid state synthesis method. The microstructure and electrical properties of prepared ceramics were investigated by XRD, SEM and other techniques. The results demonstrate that Sm2O3 doping reduces sintering temperature of BCZT lead-free piezoelectric ceramics and increases the Curie temperature Tc from 85¡䟴o 95¡䬠BCZT ceramics doped with 0.02wt%-0.1wt% Sm2O3 possess a typical ABO3 type perovskite structure.With the doping of 0.02wt% Sm2O3, the BCZT ceramics show the optimum electrical properties, and its piezoelectric constant d33, electromechanical coupling factor kp, mechanical quality factor Qm, dielecteic loss tanδ and relative dielectric constant εr reach 590 pC/N, 0.52, 43, 1.3% and 3372, respectively.
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