書誌事項
- タイトル別名
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- The Transmission Electron Microscopy Analysis on Grain Boundary Phases of Ca-La-Co M-type Sintered Ferrite Magnets
- トウカ デンシ ケンビキョウ ニ ヨル Ca-La-Coケイ Mガタ フェライト ショウケツ ジシャク ノ リュウカイソウ ノ カイセキ
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説明
<p>The microstructures of Ca-La-Co M-type sintered ferrite magnets were analyzed by Spherical Aberration Corrected Scanning Transmission Electron Microscopy (Cs-STEM) to devise guidelines for improving performance. It was confirmed that there were Ca-Si-based oxides, which consists of Si, Ca, La and Fe, at multiple-junction phases of the sintered body, after adding only SiO2 instead of both CaCO3 and SiO2, which are sintering aids for ferrite magnets. It was also confirmed that the ratio of Si, Ca, La and Fe at multiple-junction phases was 30:60:2:5. Moreover, we found that a step-terrace structure of Ca-Si-based oxides formed at the boundary of the M-type ferrite grain, and that the maximum width of the intergranular grain boundary was about half (1.15 nm) the edge length of the c-axis of the M phase. This suggested that ferrite grains were magnetically isolated by the presence of Ca-Si-based oxide phases at the intergranular grain boundary, whereby improving coercivity.</p>
収録刊行物
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- 粉体および粉末冶金
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粉体および粉末冶金 63 (10), 876-881, 2016
一般社団法人 粉体粉末冶金協会
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詳細情報 詳細情報について
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- CRID
- 1390282681286450944
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- NII論文ID
- 130005249049
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- NII書誌ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL書誌ID
- 027663017
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可