中国物理B ›› 2012, Vol. 21 ›› Issue (10): 107503-107503.doi: 10.1088/1674-1056/21/10/107503

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Improved multiferroic properties of La-doped 0.6BiFeO3–0.4SrTiO3 solid solution ceramics

马争争a, 李建青b, 田召明a, 邱洋a, 袁松柳a   

  1. a School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China;
    b School of Sciences, Wuhan University of Science and Technology, Wuhan 430070, China
  • 收稿日期:2012-02-09 修回日期:2012-02-29 出版日期:2012-09-01 发布日期:2012-09-01
  • 基金资助:
    Project supported by the Science Foundation from the Ministry of Education, China (Grant Nos. 20090142120069 and 309020) and the Special Scientific Foundation from the Chinese Central University (Grant No. 20102D006).

Improved multiferroic properties of La-doped 0.6BiFeO3–0.4SrTiO3 solid solution ceramics

Ma Zheng-Zheng (马争争)a, Li Jian-Qing (李建青)b, Tian Zhao-Ming (田召明)a, Qiu Yang (邱洋)a, Yuan Song-Liu (袁松柳)a   

  1. a School of Physics, Huazhong University of Science and Technology, Wuhan 430074, China;
    b School of Sciences, Wuhan University of Science and Technology, Wuhan 430070, China
  • Received:2012-02-09 Revised:2012-02-29 Online:2012-09-01 Published:2012-09-01
  • Contact: Yuan Song-Liu E-mail:yuansl@hust.edu.cn
  • Supported by:
    Project supported by the Science Foundation from the Ministry of Education, China (Grant Nos. 20090142120069 and 309020) and the Special Scientific Foundation from the Chinese Central University (Grant No. 20102D006).

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摘要： The 0.6(Bi1-xLax)FeO3-0.4SrTiO3 (x=0, 0.1) multiferroic ceramics are prepared by a modified Pechini method to study the effect of substitution of SrTiO3 and La in BiFeO3. The X-ray diffraction patterns confirm the single phase characteristics of all the compositions each with a rhombohedral structure. The magnetic properties of the ceramics are significantly improved by a solid solution with SrTiO3 and substitution of La. The values of the dielectric constant εr and loss tangent tan δ of all the samples decrease with increasing frequency and become constant at room temperature. The La-doped 0.6BiFeO3-0.4SrTiO3 ceramics exhibit improved dielectric and ferroelectric properties, with higher dielectric constant enhanced remnant polarization (Pr) and lower leakage current at room temperature. Compared with a anti-ferromagnetic BiFeO3 compound, the 0.6(Bi0.9La0.1)FeO3-0.4SrTiO3 sample shows the optimal ferromagnetism with remnant magnetization Mr～0.135 emμ/g and ferroelectricity with Pr～5.94 μC/cm2 at room temperature.

关键词: multiferroic, ferroelectric, dielectric constant, ferromagnetic

Abstract: The 0.6(Bi1-xLax)FeO3-0.4SrTiO3 (x=0, 0.1) multiferroic ceramics are prepared by a modified Pechini method to study the effect of substitution of SrTiO3 and La in BiFeO3. The X-ray diffraction patterns confirm the single phase characteristics of all the compositions each with a rhombohedral structure. The magnetic properties of the ceramics are significantly improved by a solid solution with SrTiO3 and substitution of La. The values of the dielectric constant εr and loss tangent tan δ of all the samples decrease with increasing frequency and become constant at room temperature. The La-doped 0.6BiFeO3-0.4SrTiO3 ceramics exhibit improved dielectric and ferroelectric properties, with higher dielectric constant enhanced remnant polarization (Pr) and lower leakage current at room temperature. Compared with a anti-ferromagnetic BiFeO3 compound, the 0.6(Bi0.9La0.1)FeO3-0.4SrTiO3 sample shows the optimal ferromagnetism with remnant magnetization Mr～0.135 emμ/g and ferroelectricity with Pr～5.94 μC/cm2 at room temperature.

Key words: multiferroic, ferroelectric, dielectric constant, ferromagnetic

中图分类号:  (Magnetomechanical effects, magnetostriction)

  • 75.80.+q
75.85.+t (Magnetoelectric effects, multiferroics) 77.84.-s (Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)