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Cu - Ni Ferrite의 결정학적 및 Mossbauer 연구
김우철(Woo Chul Kim),홍성렬(Sung Real Hong),지상희(Sang Hee Ji),이승화(Seung Wha Lee),엄영랑(Young Rang Uhm),김철성(Chul Sung Kim) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.2
Cu_(0.9)Ni_(0.1)Fe₂O₄ has been studied with Mossbauer spectroscopy and X-ray diffraction. The crystal structure is found to be a cubic spinel with the lattice constant a_0=8.386Å. The Curie temperture is determined to be Tc=755 K for a heating rate of 5K/min. The Mossbauer spectra consist of two six-line patterns corresponding to Fe³+ at the tetrahedral (A) and octahedral (B) sites. Debye temperatures for A and B sites are found to be 568 K and 194 K, respectively. Atomic migration of Cu_(0.9)Ni_(0.1)Fe₂O₄ begins near 350 K and increases rapidly with increasing temperature such a degree that 71% of the ferric ions as A sites have moved over to the B sites at 550 K.