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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Mossbauer and DSC studies of spin reorientations in Er_(2-x)Y_xFe_(14)B
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Mossbauer and DSC studies of spin reorientations in Er_(2-x)Y_xFe_(14)B

机译：Mossbauer和DSC研究Er_（2-x）Y_xFe_（14）B中的自旋重取向

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摘要

Polycrystalline Er_(2-x)Y_xFe_(14)B (x=0.0, 0.5, 1.0, 1.5) compounds have been studied by ~(57)Fe Mossbauer spectroscopy and differential scanning calorimetry (DSC) in the temperature range 80-370K. The spin reorientation phenomenon has been studied extensively by narrow step temperature scanning in the vicinity of the spin reorientation temperature. Using the procedure of subtracting the Mossbauer spectra taken for the same compound at different temperatures, it was possible t follow the influence of transition on the shape of spectra. From this procedure it was concluded that in the region of transition, each subspectrum splits into two Zeeman sextets, which are characterised by different hyperfine fields and quadrupole splittings. A consistent way of describing the Mossbauer spectra was proposed. The composition and temperature dependencies of hyperfine interaction parameters and subspectra contributions were derived from experimental spectra. Endothermic DSC peaks were observed for all compounds studied which correspond to the transition from basal plane to axial easy magnetization direction. The spin reorientation temperatures and the enthalpies of transitions were established from the DSC data. A spin arrangement diagram was constructed and spin reorientation temperatures obtained by different methods were compared.
机译：已通过〜（57）Fe Mossbauer光谱和差示扫描量热法（DSC）在80-370K的温度范围内研究了多晶Er_（2-x）Y_xFe_（14）B（x = 0.0，0.5，1.0，1.5）化合物。通过在自旋取向温度附近的窄步温度扫描对自旋取向现象进行了广泛的研究。使用减去相同化合物在不同温度下获得的Mossbauer光谱的程序，可以追踪转变对光谱形状的影响。从该过程得出的结论是，在过渡区域中，每个子谱都分裂为两个塞曼六重峰，其特征在于不同的超精细场和四极分裂。提出了描述Mossbauer光谱的一致方法。超细相互作用参数的组成和温度依赖性以及亚光谱贡献是从实验光谱中得出的。对于所研究的所有化合物均观察到吸热DSC峰，其对应于从基面到轴向易磁化方向的转变。从DSC数据确定自旋取向温度和跃迁焓。绘制了自旋排列图，比较了通过不同方法获得的自旋重取向温度。

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