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위지훈(Jee Hoon We),김삼진(Sam Jin Kim),김철성(Chul Sung Kim) 한국자기학회 2006 韓國磁氣學會誌 Vol.16 No.1
AlFeO₃ has been studied by x-ray diffraction (XRD), vibrating sample magnetometer, Mossbauer spectroscopy. The crystal structure is found to orthorhombic with the lattice parameters being a_o=4.983 Å, b_o=8.554 Å and c_o=9.239 Å, Magnetic hysteresis curve for AlFeO₃ showed weakly ferromagnetic phase at room temperature and a asymmetric shape dependent on the direction of applied field at low temperature. The Curie temperature determined by the temperature dependence of magnetization is 250 K. Mossbauer spectra of AlFeO₃ have been taken from 4.2 K to 295 K. Isomer shift at room temperature are found to be 0.11~0.32 ㎜/s, which is consistent with ferric state. The absorption lines widths become broader with increasing temperature, which is attributed to the Fe ions distribution of each cation site and anisotropy energy difference of each sublattice.