Study on Ferroelectric and Dielectric Properties of La-Doped CaBi4Ti4O15-Based Ceramics期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Study on Ferroelectric and Dielectric Properties of La-Doped CaBi₄Ti₄O₁₅-Based Ceramics

Authors:	Xialian Xinyou Huang Chunhua Gao

Affiliation:	^aSchool of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China;^bInstitute of Physics Science and Technology, Yichun University, Yichun 336000, China

Abstract:	Lanthanum doped bismuth layer structured ferroelectrics (BLSFs) Ca_1-xLa_xBi₄(Ti_0.9W_0.1)₄O₁₅(x = 0, 0.2. 0.3, 0.4, 0.6) ceramics were prepared by solid-state reaction method. X-ray diffraction (XRD) patterns showed that single phase was formed when x = 0 0.6. The effects of La³⁺ doping on dielectric, piezoelectric and ferroelectric properties of Ca_1-xLa_xBi₄(Ti_0.9W_0.1)₄O₁₅ ceramics were studied. Ca_0.7La_0.3Bi₄(Ti_0.9W_0.1)₄O₁₅ ceramic had optimal properties, its dielectric constant was 166.85, dielectric loss was 0.0063, piezoelectric strain constant was 11 pc·N⁻¹. remanent polarization was 18.1 μC·cm⁻² and coercive field was 118 kV·cm⁻¹. SEM micrographs showed that the grains of CaBi₄Ti₄O₁₅-based ceramics were plate-like. The results of energy spectrum analysis (EDS) showed that La^3- incorporation could increase Bi/Ca ratio.

Keywords:	bismuth layer structure ceramics La-doped ferroelectric rare earths
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