Y型六角铁氧体Ba2Co2-xZnxFe12O22的软化学合成与表征

Preparation and characterization of Y-type hexagonal ferrite Ba_2Co_(2-x)Zn_xFe_(12)O_(22) via a soft chemical method

以金属硝酸盐为原料,乙二胺四乙酸(ED-TA)为络合剂,采用络合法制备了一系列Zn2+取代Co2Y型铁氧体。探讨了焙烧温度和取代离子Zn2+浓度对产物的结构和磁学性质的影响。采用XRD、FT∑IR、VSM和阻抗分析对样品的结晶行为、结构和磁学性质进行了表征。结果表明在1000℃相对较低的温度下可以获得单相的Y型六角铁氧体,Zn2+对Co2+取代使得晶胞参数增加,磁化强度和矫顽力发生变化。磁晶各向异性的降低导致了共振峰向低频方向的移动和磁导率实部的增加。

Y-type hexagonal ferrite with composition Ba2Co2-xZnxFe12O22 was prepared by a complexing process using corresponding metal nitrates as raw materials and ethylene diamine tetraacetic acid（EDTA） as complexing agent.The effects of calcination temperature and Zn^2＋ concentration on the crystal structure and magnetic properties were studied.The crystallization behavior,structure and magnetic properties were characterized by XRD,FT-IR,VSM and impednce analyzer.The results indicate that the formation of single phase Y-type hexagonal ferrrite can be achieved at a relatively low temperature 1000℃.The Zn^2＋ substitution for Co^2＋ results in the expansion of crystal lattice and the variation of saturation magnetization and coercivity.The resonance peaks shift towards lower frequency and the real part of permeability increases with the decrease of the magnetic anisotropy.