Room temperature multiferroicity in Aurivillius compounds Bi₆Fe_2−xNi_xTi₃O₁₈ (0≤x≤1)

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• 作者：P. Xiong^a ; ^b ; J. Yang^a ; ^{jyang@issp.ac.cn} ; Y.F. Qin^a ; ^b ; W.J. Huang^a ; ^b ; X.W. Tang^a ; L.H. Yin^a ; W.H. Song^a ; J.M. Dai^a ; X.B. Zhu^a ; Y.P. Sun^a ; ^c ; ^d
• 关键词：A. Powders ; solid state reaction ; C. Ferroelectric properties ; C. magnetic properties
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 April 2017
• 年：2017
• 卷：43
• 期：5
• 页码：4405-4410
• 全文大小：3377 K
• 卷排序：43

文摘

We investigate the structural, magnetic, ferroelectric, and dielectric properties of Bi6Fe2−xNixTi3O18 (0≤x≤1). The coexistence of ferroelectricity and ferromagnetism were observed at room temperature for the Ni-doped samples. The ferromagnetism in Bi6Fe2−xNixTi3O18 can be understood in terms of spin canting of the antiferromagnetic coupling of the Fe-based and Ni-based sublattices via Dzyaloshinsky-Moriya interaction. Moreover, the substitution of Ni for Fe was effective for the enhancement of ferroelectric properties. The x=0.6 sample exhibits a maximum remnant polarization Pr of 37.8 μC/cm2 because of a lower leakage current. The rather large activation energy in the x=0 and 0.2 samples implies that the relaxation process may be not associated with the thermal motion of oxygen vacancies inside the bulk.