Structural and multiferroic properties of Fe-doped Ba_0.5Sr_0.5TiO₃ solids

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• 作者：Zhengang Guo ; Liqing Pan ; Chong Bi ; Hongmei Qiu ; Xuedan Zhao ; Lihong Yang ; M. Yasir Rafique
• 关键词：Ceramic ; Crystal structure ; Dielectric ; Multiferroic material
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2013
• 出版时间：January, 2013
• 年：2013
• 卷：325
• 期：Complete
• 页码：24-28
• 全文大小：757 K

文摘

The structural, dielectric, ferroelectric, and magnetic properties of bulk Fe-doped Ba_0.5Sr_0.5TiO₃ (Ba_0.5Sr_0.5Ti_1?xFe_xO₃; BSTF) solids prepared by standard solid-state reaction were investigated. X-ray diffraction (XRD) patterns confirmed the tetragonal structure of BSTF samples. Rietveld refinements of XRD data revealed that the doping ions lead to unit cell expansion in three directions. Ferroelectric and ferromagnetic orders of the samples were observed simultaneously at room temperature. According to experimental and simulated results, two possible exchange coupling mechanisms exist in the BSTF systems, namely, nearest-site antiferromagnetic coupling and next-nearest-site ferromagnetic coupling. The two coupling mechanisms coexist in BSTF systems, leading to extraordinary ferromagnetic behavior.