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首页> 外文期刊>Journal of synchrotron radiation >Zr site determination and origin of magnetic anisotropy in HDDR processed Nd_2Fe_(14) B-based magnets
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Zr site determination and origin of magnetic anisotropy in HDDR processed Nd_2Fe_(14) B-based magnets

机译:HDDR处理的Nd_2Fe_(14)B基磁体中的Zr位置确定和磁各向异性的起源

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摘要

It has been a controversial prospect about the roles of small additives such as Zr, Hf and Ga for the evolution of magnetic anisotropy in the HDDR (Hydrogenation, Dispeopotionation, Desorption and Recombination) treated Nd_2Fe_(14) B-based magnets. XAFS measurements of the Zr K-edge were carried out for the Nd_(16)Fe_(75.5)Zr_(0.5)B_8, Nd_(1.6)Zr_(0.4)Fe_(14)B and Nd_2Fe_(13.6)Zr_(0.4)B magnets. Zr, in the as-cast Nd_(16)Fe_(75.5)Zr_(o.5)B_8 ingot, is found to occupy Fe(j_2) sites in Nd_2Fe_(14)B structure, Small changes of the Zr XAFS spectra after disproportionation and recombination suggest that local portion of Nd_2Fe_(14)B phase including Zr at Fe(j_2) sites is stabilized against disproportionation, Effects of concentration, i.e. ratio of Nd to Fe, on Zr site occupancy are presented.
机译:关于小的添加剂(如Zr,Hf和Ga)在HDDR(加氢,分散,解吸附和复合)HDDR处理的Nd_2Fe_(14)B基磁体中的磁各向异性演化中的作用一直是有争议的前景。对Nd_(16)Fe_(75.5)Zr_(0.5)B_8,Nd_(1.6)Zr_(0.4)Fe_(14)B和Nd_2Fe_(13.6)Zr_(0.4)B进行Zr K边缘的XAFS测量磁铁。在铸态Nd_(16)Fe_(75.5)Zr_(o.5)B_8铸锭中发现Zr占据Nd_2Fe_(14)B结构中的Fe(j_2)位点,歧化后Zr XAFS光谱的变化很小重组表明,Nd_2Fe_(14)B相的局部包括Zr在Fe(j_2)位置是稳定的,以防止歧化,提出了浓度(即Nd与Fe的比例)对Zr位置占有率的影响。

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