摘要
以酒石酸和金属硝酸盐为原料,采用低热固相反应方法合成了Ni0.18Cu0.2Zn0.62O(Fe2O3)0.98尖晶石型铁氧体,并应用FT-IR,DSC-TG,XRD,TEM以及SEM等技术对低热固相反应过程和样品进行了研究和表征。FT-IR研究表明,酒石酸和金属硝酸盐在研磨30min后发生了低热固相反应,生成金属酒石酸盐前驱体。FT-IR和XRD分析表明,前驱体经不同温度焙烧后得到单一尖晶石相的NiCuZn铁氧体粉。依据谢乐公式计算和TEM表征,证明干凝胶在350℃分解1h后的粒径约为20～30nm,将此粉体在750℃下焙烧2h后,粒径增大到100～150nm。铁氧体于900℃烧结为陶瓷体后,晶粒约为2～4μm,烧结致密。随着烧结温度由850℃提高到900℃,NiCuZn铁氧体的矫顽力Hc有所下降,但饱和磁化强度Ms有所升高。磁谱测量表明,900℃烧结样品的磁导率为170,截止频率为32MHz,样品的磁性主要来源于畴壁位移的贡献。
Ni0.18Cu0.2Zn0.62O(Fe2O3)0.98 ferrite powders with spinel structure were synthesized by low-heating solid-state reaction method.FT-IR spectra,DSC-TG and XRD techniques were employed to investigate the solid-state reaction and the thermal decomposition of the gel precursors.The results showed that the metal nitrates could react with the tartaric acid by grinding for 30 min.The results of X-ray diffraction technique revealed that NiCuZn ferrite powders were of the single spinel phase and the spinel crystal st...
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2010年第2期243-249,共7页
Chinese Journal of Rare Metals
基金
国家“973”(2007CB613607)
云南省自然科学基金(2006E0009Q)项目资助
关键词
低热固相反应
酒石酸
NICUZN铁氧体
low-heating solid-state reaction
tartaric acid
spinel NiCuZn ferrite
