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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 >Synthesis, properties and Mossbauer study of ZrFe_(2-x)Ni_x hydrides (x = 0.2-0.8)
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Synthesis, properties and Mossbauer study of ZrFe_(2-x)Ni_x hydrides (x = 0.2-0.8)

机译：ZrFe_（2-x）Ni_x氢化物的合成，性质和Mossbauer研究（x = 0.2-0.8）

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摘要

Interaction of ZrFe_(2-x)Ni_x (x=0.2,0.4,0.6, and 0.8) pseudobinary intermetallic compounds with hydrogen was studied. It was found that these compounds can accumulate up to 1.7-1.8 wt.% H_2 at room tempera?ture. For all investigated ZrFe_(2-x)Ni_x-H_2 systems, thermodynamic functions of the beta-hydride -> alpha-solution phase transition and changes of metal matrix volume during formation of hydrides were calculated. It was shown that increase in Ni content leads to reduction of both desorption pressures and starting pressures of reaction with hydrogen in the first hydrogenation cycle compared to ZrFe_2. Mossbauer investigations, which have been carried out for all alloys as well as hydrides, revealed that Curie temperatures (T_c) and average hyperfine fields (HF_(av)) of initial alloys decrease with Ni content increase, while isomer shifts (IS) remain constant. Absorption of H_2 results in significant increase in IS together with some increase in T_c and HF_(av) for all samples. The decomposition of the hydride phases to intermetallic phases while heating from 78 K to room temperature was found to be a two-step process involving formation of the hydride phases with intermediate hydrogen content.
机译：研究了ZrFe_（2-x）Ni_x（x = 0.2、0.4、0.6和0.8）假二元金属间化合物与氢的相互作用。已经发现这些化合物在室温下可以积累高达1.7-1.8重量％的H 2。对于所有研究的ZrFe_（2-x）Ni_x-H_2系统，计算了β-氢化物的热力学函数->α-溶液相变以及氢化物形成过程中金属基质体积的变化。结果表明，与ZrFe_2相比，Ni含量的增加导致在第一个加氢循环中脱附压力和与氢气反应的起始压力均降低。对所有合金以及氢化物进行的Mossbauer研究表明，初始合金的居里温度（T_c）和平均超精细场（HF_（av））随着Ni含量的增加而降低，而异构体位移（IS）保持不变。对于所有样品，H_2的吸收导致IS的显着增加以及T_c和HF_（av）的一些增加。从78 K加热到室温时，氢化物相分解为金属间相是一个两步过程，涉及形成氢含量中等的氢化物相。

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