Substitution-driven structural and magnetic phase transitions in Bi-0.86(La, Sm)(0.14)FeO3 system

作者：Khomchenko V A^*; Pereira L C J; Paixao J A

来源：Journal of Physics D: Applied Physics , 2011, 44(18): 185406.

DOI：10.1088/0022-3727/44/18/185406

Solid-state synthesis and investigation of crystal structure and magnetic properties of Bi0.86La0.14-x SmxFeO3(0 <= x <= 0.14) ceramics were performed. It was found that a rhombohedral to orthorhombic phase transition took place in the series with decreasing average ionic radius of the substituting elements occupying the A-site of the ABO(3) perovskite. Magnetic properties of the compounds were shown to correlate with evolution of their structural state. Pure rhombohedral samples 0 <= x <= 0.06 were obtained in a mixed antiferromagnetic/weak ferromagnetic state. A small residual magnetization characteristic of the compounds was found to weakly depend on change of the chemical composition. Progressive increase of the residual magnetization was observed upon the rhombohedral-to-orthorhombic transition. Reasons for the appearance of the weak ferromagnetism in orthorhombic and rhombohedral phases of the Bi-0.86(La, Sm)(0.14)FeO3 compounds were analysed.

• 出版日期2011-5-11