Nd-Fe-B 焼結磁石の界面構造と局所結晶場
Nd-Fe-B 焼結磁石の界面構造と局所結晶場
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Nd-Fe-B烧结磁体的界面结构和局部晶场
DOI：
10.3379/jmsjmag.26.1060
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发表时间：
2002
影响因子：
--
通讯作者：
宏朗 加藤
中科院分区：
文献类型：
--
作者：
顕 槇田;治 山下;宏朗 加藤
用高分辨率透射电子显微镜研究了 Nd-Fe-B 烧结磁体中四方 Nd2Fe14B 相与面心立方富 Nd 相之间的相界。在直接接触的两相之间检测到两种类型的晶体取向关系； （110）四。 // (110)fcc，[001]tetra。 // [223]fcc 和 (110)tetra。 // (010)fcc，[001]tetra。 // [102]fcc。基于重合位点晶格模型，对相界的原子结构进行了建模，并且与观察到的关系一致。在不考虑富Nd相的情况下，利用点电荷模型计算出边界附近Nd位点的有效各向异性系数Keff为2.72×106 J/m3。当考虑富 Nd 相中 Nd3+ 的点电荷时，Keff 增加到 4.37 × 106 J/m3，因为阳离子的正电荷增强了边界附近的磁晶各向异性，从而抑制了反向磁畴的成核。
The phase boundary between tetragonal Nd2Fe14B phase and fcc Nd-rich phase in Nd-Fe-B sintered magnets was investigated with a high-resolution transmission electron microscope. Two types of crystallographic orientation relationships were detected between two phases in direct contact; (110)tetra. // (110)fcc, [001]tetra. // [223]fcc and (110)tetra. // (010)fcc, [001]tetra. // [102]fcc. The atomic structure of the phase boundary, based on the coincidence site lattice model, was modeled, and agreed with the observed relationships. The effective anisotropic coefficient Keff at the Nd sites near the boundary was calculated to be 2.72 × 106 J/m3 by using the point charge model when no account was taken of the Nd-rich phase. Keff increases to 4.37 × 106 J/m3 when the point charge of Nd3+ in the Nd-rich phase is taken into account, since the positive charge of the cation enhances the magnetocrystalline anisotropy near the boundary, where the nucleation of the reverse domain may be suppressed.
影响因子：
3.2
作者：
SAGAWA, M;FUJIMURA, S;MATSUURA, Y
通讯作者：
MATSUURA, Y