【摘要】 采用溶胶-凝胶法在950℃下烧结得到了Y³⁺取代部分Fe³⁺的Ni_0.3Cu_0.2Zn_0.5Y_xFe_2-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Y³⁺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Ni_0.3Cu_0.2Zn_0.5Fe₂O₄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68.98 emu/g,居里温度升高到215℃。更多还原

【Abstract】 The Ni_0.3Cu_0.2Zn_0.5Y_xFe_2-xO₄（where x= 0, 0.025, 0.05, 0.075, 0.1） ferrite with Y³⁺ substituted partial Fe³⁺ 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 Y³⁺ 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 Ni_0.3Cu_0.2Zn_0.5Fe₂O₄ 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 ℃.更多还原