镍钴锌纳米铁氧体的制备及磁热性能

摘要

以乙酰丙酮盐为前驱体,三乙二醇为溶剂,采用多元醇法制备了纳米Ni0.5-xCoxZn0.5Fe2O4(x=0,0.1,0.2,0.3和0.4)铁氧体.通过X射线衍射仪(XRD)、 透射电子显微镜(TEM)、 傅里叶变换红外光谱仪(FTIR)和振动样品磁强计(VSM)等对样品的结构、 形貌和磁性能进行了表征.结果表明,所得纳米Ni0.5-x Cox Zn0.5 Fe2 O4铁氧体的分散性较好,尺寸均一.在室温下产物的剩磁和矫顽力均较小,表现出亚铁磁性.纳米Ni0.3 Co0.2 Zn0.5 Fe2 O4铁氧体的饱和磁化强度达到41.34 A·m2·kg-1,其在交变磁场中升温可达到55℃,表现出较好的磁热性能.%Ni0.5-xCoxZn0.5Fe2O4 nanoferrites(x=0, 0. 1, 0. 2, 0. 3 and 0. 4) were synthesized via polyol process using triethylene glycol as the solvent and acetylacetonate metal salts as precursors. The structure, morphology and magnetic properties of the resultant particles were characterized by means of X-ray diffraction ( XRD ) , transmission electron microscopy ( TEM ) , Fourier transform infrared spectrometry ( FTIR ) and vibrating sample magnetometry ( VSM ) . The results show that Ni-Co-Zn nanoferrites have uniform size and good dispersibility. The monodisperse Ni0. 5-x Cox Zn0. 5 Fe2 O4 nanoferrites show a typical ferrimagnetic behavior at room temperature. The Ni0. 3 Co0. 2 Zn0. 5 Fe2 O4 nanoferrites have maximum saturation magnetization of 41. 34 A·m2 ·kg-1 . The temperature of Ni0. 3 Co0. 2 Zn0. 5 Fe2 O4 nano ferrites suspension can reach up to 55 ℃ in alternating magnetic field, which reveals its sufficient magnetocaloric properties.