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张晓燕,杜强,赵晓楠,张敏,齐西伟.BiFeO3-BaTiO3-LaFeO3三元多铁性陶瓷材料的制备及性能研究[J].稀有金属材料与工程(英文),2020,49(2):520~525.[Zhang Xiaoyan,Du Qiang,Zhao Xiaonan,Zhang Min and Qi Xiwei.Preparation and Properties of Multiferroic BiFeO3–BaTiO3–LaFeO3 Ceramics[J].Rare Metal Materials and Engineering,2020,49(2):520~525.]
Preparation and Properties of Multiferroic BiFeO3–BaTiO3–LaFeO3 Ceramics
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Received:March 14, 2019  Revised:April 23, 2019
DOI:
Key words: multiferroic ceramics  microstructure  electric properties  magnetoelectric effect
Foundation item:国家自然科学基金资助(项目号51602042)
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Zhang Xiaoyan,Du Qiang,Zhao Xiaonan,Zhang Min and Qi Xiwei  
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Abstract:
      A series of multiferroic 1-x(0.71BiFeO3-0.29BaTiO3)-xLaFeO3 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) ceramics were synthesized by solid state reaction. The effects of LaFeO3 content in 0.71BiFeO3-0.29BaTiO3 system on structure, microstructure, electric and magnetoelectric properties were investigated. All the ceramics form a single phase perovskite structure, and structural phase transition is formed with the increase of LaFeO3. The ceramics show good microscopic appearance. The grain sizes are uniform and decrease obviously with increasing of LaFeO3, which acts as an inhibitor for grain growth. The dielectric constants are decreased by the doping level of LaFeO3. The ceramic of x = 0.1 exhibits low leakage current density J with the value around 10-7~10-8 A/cm2. With the increase of LaFeO3, the remnant polarization and the magnetoelectric coefficient aME of the ceramics attain maximum at x = 0.1, with the value of Pr = 0.45?C/cm2 and aME = 132.21 mV/cm?Oe, respectively. These results suggest that the ferroelectricity properties and ferromagnetism effect can be improved simultaneously by adding suitable LaFeO3.