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http://dx.doi.org/10.4283/JKMS.2009.19.1.012

The Effect of Ba and Fe Concentration on Soft Magnetic Properties of Z-Type Barium Ferrite  

Cho, Kwang-Muk (Department of Advanced Materials Science and Engineering, Kangwon National University)
Nam, In-Tak (Department of Advanced Materials Science and Engineering, Kangwon National University)
Abstract
Z-type barium ferrite [($Ba_{3}Co_{0.8}Zn_{1.2}Fe_{24}O_{41}$, $Ba_{3+{\delta}}Co_{0.8}Zn_{1.2}Fe_{24}O_{41}$ ${\delta}$ = 3, 5, 7, 13 wt%. $Ba_{3}Co_{0.8}Zn_{1.2}Fe_{24+{\delta}}O_{41}$ ${\delta}$ = 5, 7, 10 wt% )] were synthesized using co-precipitation method. The microstructure and magnetic properties of synthesized particles were investigated. In all prepared particles M-type Ba ferrite is identified with Z-type Ba ferrite together. It is found that particles having 7 wt% for Ba and 5 wt% for Fe excess addition revealed high saturation magnetization, respectively. All synthesized particles showed relatively high coercivity for device application. This result may be attributed to the contribution of M-type Ba ferrite. Ba and Fe excess addition was not affected to the structural change of CoZnZ Ba ferrite. The certain amount of excess additions of Ba and Fe and the 2 step heat-treatment may be beneficial to the improvement of soft magnetic properties of Z-type barium hexa-ferrite
Keywords
Z-type barium ferrite; co-precipitation; saturation magnetization; coercivity; Ba excess addition; Fe excess addition;
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