철을 미량 치환한 La - Sr - Mn - O의 결정학적 및 자기적 특성 연구

다국어 초록 (Multilingual Abstract)

The iron-doped perovskite La_(0.67)Sr_(0.33)Mn_(0.99)(57)^Fe_(0.01)O₃ compound has been studied by x-ray diffraction, Mossbauer spectroscopy, and vibrating sample magnetometry. The single phase of the polycrystalline La_(0.67)Sr_(0.33)Mn_(0.99)(57)^Fe_(0.01)O₃ powder has been prepared by a waterbased solgel method. Crystalline La_(0.67)Sr_(0.33)Mn_(0.99)(57)^Fe_(0.01)O₃ was a rombohedral structure with lattice parameters α_0=5.480 Å, α = 60.259°. Mossbauer spectra of La_(0.67)Sr_(0.33)Mn_(0.99)(57)^Fe_(0.01)O₃ have been taken at various temperatures ranging from 20 to 400 K. As the temperature increases toward the Curie temperature, T_C=375 K, the Mossbauer spectra show line broadening and the difference between the 1, 6 and 3, 4 linewidths is caused by the anisotropic hyperfine field fluctuation. The anisotropic field fluctuation of +H (P+=0.80) is greater than -H (P_=0.20). We calculated that the anisotropy energy was 124.01 erg/㎤ for T=150 K which is associated with the large line broadening.