You can read the refs such as Q.J. Han, D.H. Ji, G.D. Tang, Z.Z. Li, X. Hou, W.H. Qi, R.R. Bian, S.R. Liu, Dependence of magnetization on cation distributions in the spinel ferrites Cu1-xZnxFe2O4 (0≤x≤1) [J], physica status solidi (a), 209 (2012) 766.Xu Jing, Qi Wei-Hua, Ji Deng-Hui, Li Zhuang-Zhi, Tang Gui-De Zhang, Xiao-Yun Shang, Zhi-Feng, Lang Li-Li.Study on cation distribution and magnetic moment of Ti ions in spinel ferrites Ni1-xTixFe2O4 [J], Acta Physica Sinica, 2015, 64, 017501.J. Xu, D.H. Ji , Z.Z. Li, W.H. Qi, G.D. Tang, Z.F. Shang, X.Y. Zhang. Magnetic moments of Ti cations in Ti-doped Ni0.68Fe2.32O4 spinel ferrites [J]. Journal of Alloys and Compounds, 619 (2015) 228. G.D. Tang, D.H. Ji, Y.X. Yao, S.P. Liu, Z.Z. Li, W. H. Qi, Q.J. Han, X. Hou, D.L. Hou, Quantum-mechanical method for estimating ion distributions in spinel ferrites [J], Applied Physics Letters, 98 (2011) 072511.