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Ni₁-xZnxFe₂O₄(0≤x≤1) Ferrite의 자기적 성질 연구
조익한(I. H. Cho),양재석(J. S. Yang),김응찬(E. C. Kim),강신규(S. G. Kang) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.6
The magnetic properties of Ni_(1-x)Zn_xFe₂O₄ have been studied by X-ray diffractometry and Mossbauer Spectroscopy at room temperature. The X-ray diffraction study show that spinel structure is formed in all x, lattice constants linearly increased from 8.3111 Å to 8.4184 Å(± 0.0003) with increasing x from 0 to 1, and oxygen parameter increase with increasing x. Mossbauer spectrum shows that Ni_(1-x)Zn_xFe₂O₄(x=0) has two antiparallel magnetic structure due to Fe³+ octahedral site and Fe³+ tetrahedral site. Ni_(1-x)Zn_xFe₂O₄ with 0.2≤x≤0.6 has magnetic structure of Yafet and Kittel, in particularly, specimen with x=0.6 shows relaxation effect. Specimen with x≥0.8 show paramagnetic quadrupole splitting. The isomer shift is independent of x, but quadrupole splittings decrease with increasing x in the range of 0.8≤x≤1, and nuclear magnetic fields decrease with increasing x in the range of 0≤x≤0.6. The magnetic properties of Ni_(1-x)Zn_xFe₂O₄ change from ferrimagnetics to paramagnetics with increasing x.