Ca-La-Co系M型フェライトの組成と磁気特性
Ca-La-Co系M型フェライトの組成と磁気特性
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Ca-La-Co M型铁氧体的成分及磁性能
DOI：
10.2497/jjspm.55.541
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
幸夫 豊田
中科院分区：
文献类型：
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作者：
義徳 小林;誠一 細川;悦志 尾田;幸夫 豊田
研究了Ca-La-Co M型（Ca 1-xLaxCoyFen-yOa）铁氧体磁体的合成及磁性能。合成了M型单相煅烧粉末，其组成为x=0.5，y=0.2-0.3，n=10.0 ~ 10.8。在x=0.5，y=0.3，n=10.4的烧结磁体中，获得了很高的磁性能，其J_r =0.453 T（4530 G），HcJ=435 kA/m（5470 Oe）。磁性能大大超过Sr-La-Co M型铁氧体，这是最高级别的M型硬铁氧体。这种改善可以归因于与Sr-La-Co M型铁氧体相比各向异性磁场增加了20%。与Sr-La-Co铁氧体的0.16%/K相比，矫顽力的温度依赖性也得到改善，ΔHcJ/HcJ/ΔT= 0.11%/K。
A synthesis and magnetic properties of Ca-La-Co M-type (Ca1-xLaxCoyFen-yOa) ferrite magnets were investigated. A M-type singlephase calcined powder was synthesized with a composition of x=0.5, y=0.2-0.3 and n=10.0-10.8. And a very high magnetic properties of Jr=0.453 T (4530 G) and HcJ=435 kA/m (5470 Oe) were obtained with a composition of x=0.5, y=0.3 and n=10.4 in sintered magnets. The magnetic properties greatly exceeds that of Sr-La-Co M-type ferrite, which has been the highest grade M-type hard ferrite. The improvement can be attributed to the 20% increase in anisotropic magnetic field in comparison to that of Sr-La-Co M-type ferrite. The temperature dependence of coercivity was also improved to ΔHcJ/HcJ/ΔT=0.11 %/K, compared to 0.16 %/K in Sr-La-Co ferrites.