Y3+掺杂对Ni-Cu-Zn铁氧体纳米颗粒结构和磁性能的影响

Doping Effect of Y3+ on Structure and Magnetic Properties of Ni-Cu-Zn Ferrite Nanoparticles

采用溶胶-凝胶法在950℃下烧结得到了Y^3+取代部分Fe3+的Ni0.3Cu0.2Zn0.5YxFe2-xO4铁氧体,掺杂量分别为0、0.025、0.05、0.075和0.1。对样品的结构和磁性能进行了研究,发现少量的Y^3+掺杂并不会破坏Ni-Cu-Zn铁氧体的晶体结构,但是当掺杂量大于0.025时会有少量YFeO3杂相生成。随着掺杂量的增加,晶格常数先减小后增大,晶粒尺寸和饱和磁化强度先增大后减小。与纯的Ni0.3Cu0.2Zn0.5Fe2O4铁氧体相比,掺杂后的样品的矫顽力、剩磁、矩形比和居里温度都增加,但均表现为顺磁性。当掺杂量为0.025时,样品的饱和磁化强度达到了68.98emu/g,居里温度升高到215℃。

The Ni0.3Cu0.2Zn0.5YxFe2-xO4 ( where x = 0,0.025,0.05,0.075,0.1) ferrite with Y3+ substituted partial Fe^3+ was synthesized by sol-gel method at 950 ℃. The structure and magnetic properties of the sample were studied. It was found that a small amount of Y^3+ doping does not destroy the crystal structure of Ni-Cu-Zn ferrite,but when the doping amount is more than 0.025,a small amount of YFeO3 foreign phase is formed. As the doping amount increases,the lattice constant first decreases and then increases,and the grain size and saturation magnetization increase first and then decrease. Compared with pure Ni0.3Cu0.2Zn0.5Fe2O4 ferrite,the coercivity,remanence,squareness ratio and Curie temperature of the doped samples increased,but all samples showed a paramagnetism. When the doping amount is 0.025,the saturation magnetization reaches 68.98 emu /g,and the Curie temperature increased to 215 ℃.