Superparamagnetism in Zn Substituted Copper-gallate Ferrite  

作　　者：N.N. Nikitenkov A.M. Hashhash I.P. Chernov Yu.I. Tyurin 

机构地区：[1]Tomsk polytechnic university

出　　处：《沈阳理工大学学报》2010年第3期80-86,共7页Journal of Shenyang Ligong University

摘　　要：Solid solution of spinel ferrite Cu1-xZnxFe2-yGayO4 with (0.0≤x≤0.5 and y=0.1) are synthesized. XRD measurements confirm the presence of single-phase tetragonal structure with c/a>1 for CuFe2O4 and samples with (x=0.0 and 0.1). The tetragonal phase is attributed to the presence of the cooperative Jahn-Teller Cu ions in the octahedral B-site in the spinel lattice. Tetragonal-to-cubic transformation is occurred at the compositional parameter x≥0.2 and the lattice parameter a is found to decrease with increasing Zn content x. 57Fe Mssbauer measurements at 293K for these compounds reveal superparamagnetic phase for samples with (0.0≤x≤0.2). In contrast,Mssbauer spectra at 12K for these materials show well ordered spectra where,the cation distribution and the hyperfine parameters are determined.Solid solution of spinel ferrite Cu1-xZnxFe2-yGayO4 with （0.0≤x≤0.5 and y=0.1） are synthesized. XRD measurements confirm the presence of single-phase tetragonal structure with c/a1 for CuFe2O4 and samples with （x=0.0 and 0.1）. The tetragonal phase is attributed to the presence of the cooperative Jahn-Teller Cu ions in the octahedral B-site in the spinel lattice. Tetragonal-to-cubic transformation is occurred at the compositional parameter x≥0.2 and the lattice parameter a is found to decrease with increasing Zn content x. 57Fe Mssbauer measurements at 293K for these compounds reveal superparamagnetic phase for samples with （0.0≤x≤0.2）. In contrast,Mssbauer spectra at 12K for these materials show well ordered spectra where,the cation distribution and the hyperfine parameters are determined.

关 键 词：尖晶石 晶格参数 晶体结构 铁氧体 

分 类 号：TQ175.713[化学工程—硅酸盐工业]