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

doi:10.1088/1674-1056/21/10/107503

Abstract The 0.6(Bi_1-xLa_x)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 ε_r 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 (P_r) and lower leakage current at room temperature. Compared with a anti-ferromagnetic BiFeO₃ compound, the 0.6(Bi_0.9La_0.1)FeO₃-0.4SrTiO₃ sample shows the optimal ferromagnetism with remnant magnetization M_r～0.135 emμ/g and ferroelectricity with P_r～5.94 μC/cm² at room temperature.

Keywords: multiferroic ferroelectric dielectric constant ferromagnetic

Received: 09 February 2012
Revised: 29 February 2012
Accepted manuscript online:

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

Fund: 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).

Corresponding Authors: Yuan Song-Liu
E-mail: yuansl@hust.edu.cn

Cite this article:

Ma Zheng-Zheng (马争争), Li Jian-Qing (李建青), Tian Zhao-Ming (田召明), Qiu Yang (邱洋), Yuan Song-Liu (袁松柳) Improved multiferroic properties of La-doped 0.6BiFeO₃–0.4SrTiO₃ solid solution ceramics 2012 Chin. Phys. B 21 107503

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

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