Microstructure and temperature dependence of magnetic properties of CuO-added MnZn ferrites

稀有金属（英文版）, 2011, 30(3): 287-291. doi: 10.1007/s12598-011-0385-3

^1, , ^2, , ^3, , ^4,

1.College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China;State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China

2.State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China

3.College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China

4.State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China

Microstructure and temperature dependence of magnetic properties of CuO-added MnZn ferrites

LI Lezhong ^1, , LAN Zhongwen ^2, , ZHU Xinghua ^3, , YU Zhong ^4,

2.State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China

3.College of Optoelectronic Technology, Chengdu University of Information Technology, Chengdu 610225, China

4.State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China

Keywords： inorganic compounds

MnZn ferrites with the chemical formula Mn<,0.68>Zn<,0.25>Fe<,2.07>O<,4> have been prepared by a conventional ceramic technique. Then, the effects of CuO addition on the microstructure and temperature dependence of magnetic properties of MnZn ferrites were investigated by characterizing the fracture surface micrograph and measuring the magnetic properties over a temperature ranging from 25 to 120℃. The results show that the lattice constant and average grain size increase with the increase of CuO concentration. When the CuO concentration is below 0.07 wt.%, the initial permeability and saturation magnetic flux density increase monotonously, and the temperature of the secondary maximum peak in the curve of initial permeability versus temperature and the lowest power loss shift to a lower temperature with the increase of CuO concentra- tion. However, excessive CuO concentration (>0.07 wt.%) results in abnormal grain growth and porosity increase, which causes the initial permeability and saturation magnetic flux density decrease and the power loss increase at room temperature. Furthermore, the temperature of the secondary maximum peak in the curve of initial permeability versus temperature and the lowest power loss shift to a higher temperature.

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Microstructure and temperature dependence of magnetic properties of CuO-added MnZn ferrites

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