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다결정(Fe, In, Eu)₂O₃ 계의 자기적 성질에 관한 연구
김정기(J. G. Kim),서정철(J. C. Sur),한은주(E. J. Han),홍양기(Y. K. Hong) 한국자기학회 1991 韓國磁氣學會誌 Vol.1 No.1
The magnetic properties of the polycrystalline (Fe₂O₃)_(1-x-y)(In₂O₃)_x(Eu₂O₃)_y (x=0.01, y=0.02 and x=0.02, y=0.03) have been studied by the methods of X-ray diffraction, Mossbauer effect, and magnetic hysteresis measurement. The X-ray diffraction patterns show that the samples have a same crystal structure as α-Fe₂O₃. From the analysis of the temperature dependence of the quadrupole splitting and average half-width, it is found that the Morin transition occurs in the sample of x=0.01 and y=0.02 and the spin angle defined as the angle between the [111] crystal axis and antiferromagnetic vector, changes from about 35° to the (111) plane as increasing the temperature in the sample of x=0.02 and y=0.03. The temperature dependence of magnetic hyperfine field is analyzed by using the spin-wave theory. The isomer shift values at room temperature are found to be given by about 0.35㎜/s for the samples which means that the Fe ions belong to 3+ion. The temperature dependence of isomer shift was analyzed by using the Debye model.