臺灣博碩士論文加值系統

本實驗以微量的四氧化三鈷及氧化鈦置換錳鋅鐵氧磁體中的氧化鐵，針對
不同的置換量及燒結溫度，分析其對低功率錳鋅鐵氧磁體的影響。進行分
析的有：初導磁率、功率損失、晶格常數、電阻率、以及金相組織的觀察
。由外插之第二高峰(ESMP)往低溫或高溫的移動，可以看出二價鐵離子隨
鈷含量增加而減少，隨鈦含量增加而增加。實驗結果顯示，鈷可有效的降
低磁滯損失，鈦則可同時降低磁滯損失與渦電流損失。在燒結溫度方面，
分別在1325 (Co)與1300(Ti)有最佳的磁特性。至於同時加入鈷與鈦的影
響，則因燒結後的緻密性不佳，性質較差。

In this study, Mn-Zn ferrites of chemical composition Mn.725
Zn.194CoxTiyFe2.081-x-yO4 were fabricated with part of the Fe2
O3 raw material been substituted with Co3O4 and TiO2. We
studied the effect of Cobalt, Titanium and sintering
temperature for lowering the power loss of Mn-Zn ferrites.
The initial permeability vs. temperature, power loss vs.
temperature, lattice constant, resistivity vs. frequency,
and microstructure were examined. The shift of extrapolated
secondary maximum permeability (ESMP) were used to show the
variation of the Fe+2 content. As the contents of Co or Ti is
increased, the Fe+2 content is decreased or increased
respectively. It is found that the hysteresis loss can be
reduced by Co at low temperature. While both the hysteresis
loss and eddy current loss can be reduced by Ti. The optimum
sintering temperatures for Co and Ti substitution are 1325 and
1300 respectively. The properties of Co/Ti substituted Mn-Zn
ferrites are inferior. Apparently, it was due to the lower
sintered density.