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Mossbauer 분광학을 이용한 Ni0.5Co0.5Fe₂O₄의 Atomic migration 연구
이승화(Seung Wha Lee),홍성렬(Sung Real Hong),박승일(Seung leI Park),김철성(Chul Sung Kim) 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.1
The crystallographic and magnetic properties of the ferrimagnetic Ni_(0.5)Co_(0.5)Fe₂O₄ have been studied by X-ray and Mossbauer measurements. The Crystal structure is found to be spinel structure with the lattice constant a_0 = 8.346 ± 0.005 Å. Mossbauer spectra of Ni_(0.5)Co_(0.5)Fe₂O₄ have been taken at various temperatures rauging from 13 to 780 K. The isomer shifts indicate that the valence states of the Fe ions for tetrahedral(A) and octahedral (B) sites have ferric character. Debye temperatures for the A and B sites are found to be 441± 5 K and 321± 5 K, respectively. Atomic migration from the A to the B sites starts near 500 K and increases rapidly with increasing temperature to such a degree that 51 % of the ferric ions at the A sites have moved over to the B sites by 700 K.