The effect of hydrogen on the magnetic properties of Fe-Ni base Invar alloys
The effect of hydrogen on the magnetic properties of Fe-Ni base Invar alloys
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DOI：
10.1088/0305-4608/10/4/025
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发表时间：
1980-04
期刊：
影响因子：
--
通讯作者：
T. Sohmura;F. Fujita
中科院分区：
文献类型：
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作者：
T. Sohmura;F. Fujita
利用57Fe穆斯堡尔效应研究了吸附氢对FCC铁镍基因瓦尔合金磁性结构的影响。随着电解加氢的进行，形成了与基体相同FCC类型的氢化物相，具有低场分量的穆斯堡尔谱的特征吸收被认为是这些合金的因瓦尔效应的起源，这一特征吸收急剧改变为简单的强铁磁吸收。然而，通过进一步加氢，氢化物相的内部场变小。氢对因瓦尔合金磁性结构的影响可以用斯通纳能带模型来解释，或者更严格地说，用氢引起的局部键合状态的柔性能带模型来解释。氢对因瓦尔合金热膨胀系数的提高也是同样的原因。
The effect of absorbed hydrogen on the magnetic structure of FCC iron-nickel base Invar alloys was studied by means of the 57Fe Mossbauer effect. As the electrolytic hydrogenation proceeded, hydride phases of the same FCC type as the matrix were formed and the characteristic absorption of the Mossbauer spectrum with low field components, which is believed to be an origin of the Invar effect of these alloys, was drastically changed to a simple strong ferromagnetic one. By further hydrogenation, however, the internal field of the hydride phase became smaller. This effect of hydrogen on the magnetic structure of Invar alloys was interpreted in terms of Stoner's band model or more rigorously, a flexible band model with the local bonding state induced by hydrogen. The observed increase of the thermal expansion coefficient of Invar alloys by hydrogen was accounted for in the same way.