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Structure and Electric Properties of Mn-doped (Na0.5Bi0.5)TiO3-(K0.5Bi0.5)TiO3-BaTiO3-SrTiO3 Ceramics

LI Xiaohong,TU Na, JIANG Xiangping, ZHAN Hongquan, FU Xiaolong, ZHENG Kaiping

(Key Laboratory of Jiangxi Province for Advanced Ceramic Materials, Jingdezhen Ceramic Institute,Jingdezhen, Jiangxi 

333001)

Abstract:  Mn-modified 0.824(Na0.5Bi0.5)TiO3-0.08(K0.5Bi0.5)TiO3-0.018BaTiO3-0.078SrTiO3 (abbreviated as (1-x)NKBS-xMn) lead-free piezoelectric ceramics were prepared by the solid state reaction method. The effect of MnCO3 content (0≤x≤2.0%) on the microstructure and electrical properties of the ceramics were studied carefully. It is found that all the samples exhibit a pure perovskite phase. The grain size of those materials increases with the doping of MnCO3. MnCO3 doping can increase the relative density of NKBS ceramics and decrease the dielectric loss tanδ. The electromechanical planar coupling factor kp and the mechanical quality factor Qm increase with x =0.5% compared with pure NKBS. This means that the dopant of MnCO3 has "soft and hard dopant properties". The (1-x)NKBS-xMn system shows relaxor characteristics. The values of the dispersion factor γ increase with the MnCO3 content increasing.

Keywords: lead-free piezoelectric ceramics; morphotropic phase boundary; electric properties


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