Ni-Zn铁氧体粉体的水热法制备与磁性研究  

Preparation of Ni_(0.5)Zn_(0.5)Fe_2O_4 Nanopowders by Hydrothermal Method and Investigation on the Magnetic Properties

作　　者：阳征会[1] 龚竹青[1] 李宏煦[2] 马玉天[1] 陈文汨[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083 [2]北京科技大学冶金与生态学院,北京100083

出　　处：《矿冶工程》2006年第4期39-42,共4页Mining and Metallurgical Engineering

基　　金：国家自然科学基金资助项目(50204001)

摘　　要：采用水热法合成Ni0.5Zn0.5Fe2O4粉体，并用XRD、TEM和VSM对粉体进行表征。实验结果表明：在pH=8时，130℃反应1h才生成比较完整的Ni0.5Zn0.5Fe2O4尖晶石型晶体；温度高和反应时间长有利于得到晶型结构好的粉体；粉体颗粒均匀呈球形，粒子尺寸随反应时间的延长和温度的升高而增大。130—200℃水热反应过程的晶粒生长活化能为41．6kJ／mol。磁性测量表明采用不同温度热处理的Ni0.5Zn0.5Fe2O4粉体，随热处理温度升高，饱和磁化强度增加，矫顽力下降。Hydrothermal method was introduced to prepare Ni0.5Zn0.5Fe2O4 nanometer-sized powders of single spinel phase crystalline, and the microstructure and magnetic properties of the as-prepared nanopowders were analyzed using XRD, TEM and VSM. The results show that the single spinel phase of Ni0.5Zn0.5Fe2O4 powders began to form at a relatively low temperature （130 ℃ ） and short time （1 h） while pH =8. The crystallization of the spinel phase can be improved and the particle can be enlarged with a prolonged reaction time and an increased temperature in the hydrothermal process. The activation energy for Ni0.5Zn0.5Fe2O4 grain growth between 130 ℃ and 200 ℃ with a duration of 1 h is 41.6 kJ/mol. Magnetic measurements suggest that the saturation magnetization （Ms） increases while the coercitivity （Hc） descends with the heightening sinter temperature for Ni0.5Zn0.5Fe2O4 nanoparticles.

关 键 词：水热合成 磁性材料 Ni—Zn铁氧体 纳米粉体 

分 类 号：TG31[金属学及工艺—金属压力加工]