单分散Ni_xZn_(1-x)Fe_2O_4纳米颗粒的制备及其磁热效应  

Synthesis and Magnetocaloric Effect of Monodisperse Ni_xZn_(1-x)Fe_2O_4 Nanoparticles

作　　者：赵海涛[1] 刘瑞萍[1] 张强[1] 王俏[1] 马瑞廷[1] 

机构地区：[1]沈阳理工大学材料科学与工程学院,沈阳l10159

出　　处：《无机化学学报》2016年第1期63-68,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.51303108);辽宁省高等学校优秀人才支持计划(No.LJQ2014025);辽宁省自然科学基金(No.2014020094)资助项目

摘　　要：以乙酰丙酮金属盐为前驱体,三乙二醇为溶剂,采用多元醇法制备了镍锌不同配比的Ni_xZn_(1-x)Fe_2O_4(x=0,0.3,0.5,0.7和1.0)铁氧体,并通过X射线衍射仪(XRD),透射电子显微镜(TEM)和振动样品磁强计(VSM)等对样品的结构、形貌、磁性能和磁热性能进行了表征。结果表明:Ni_xZn_(1-x)Fe_2O_4铁氧体分散性较好,尺寸均一,形状近似球形,平均粒径为4~5 nm。Ni_xZn_(1-x)Fe_2O_4纳米颗粒在室温下表现出亚铁磁性,饱和磁化强度随着镍含量的增加先增大后减小,当x=0.5时达到最大值29.38 emu·g^(-1)。在382k Hz交变磁场作用下,Ni_(0.5)Zn_(0.5)Fe_2O_4铁氧体温度可升温至313 K,表现出较好的磁热性能。NixZn1-xFe2O4ferrites（x=0, 0.3, 0.5, 0.7 and 1.0） nanoparticles have been achieved by the polyol process using triethylene glycol as a solvent and acetylacetonate metal salts as precursors. The structure, morphology,magnetic properties and magnetocaloric effect under alternating magnetic field of resultant particles were characterized by X-ray diffraction（XRD）, transmission electron microscopy（TEM） and vibrating sample magnetometry（VSM）. The results show that Ni Zn ferrites nanoparticles have uniform size and good dispersibility with approximate spherical shape. The average sizes are about 4 5 nm. The monodisperse NixZn1-xFe2O4 nanoparticles show a typical ferrimagnetic behavior at room temperature. The saturation magnetization increases and then decreases with the increase of Ni2＋ concentration. The maximum saturation magnetization with concentration of Ni2＋up to x=0.5 is determined to be 29.38 emu·g-1. The temperature of Ni0.5Zn0.5Fe2O4 ferrites can reach up to313 K under a 382 k Hz magnetic field which reveals its sufficient heating ability.

关 键 词：NI-ZN铁氧体 多元醇法 磁性能 磁热效应 

分 类 号：O614.813[理学—无机化学] O614.241[理学—化学]