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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 >Hydrogen absorption characteristics in Zr0.2Ho0.8CoFe
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Hydrogen absorption characteristics in Zr0.2Ho0.8CoFe

机译：Zr0.2Ho0.8CoFe中的氢吸收特性

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摘要

Hydrogen absorption studies have been carried out on the Zr0.2Ho0.8CoFe alloy which has the C15 cubic Laves phase structure. The data were collected in the temperature and pressure ranges 27 less than or equal to T(degrees C) less than or equal to 150 and 0.05 less than or equal to P(bar) less than or equal to 45 respectively. A maximum hydrogen concentration of 9 hydrogen atoms per formula unit at 43 bar at RT is observed. The P-C isotherms show two plateau regions which are identified as the (alpha+beta) and (beta+gamma) phases. These are confirmed from the variation of thermodynamic parameters as the function of hydrogen concentration and from the powder X-ray diffractograms of the samples taken at different hydrogen concentrations. The relative partial molar enthalpy () and entropy () of hydrogen are found to be in the ranges -(1-8) kJ (mol H)(-1) and -(13-22) J K-1 (mol H)(-1), respectively. The unit cell volume expansion (Delta V/V) up to 22% is found at the maximum hydrogen concentration at RT without a change in its crystal structure. The powder X-ray diffractogram of Zr0.2Ho0.8CoFeH9 does not indicate the occurrence of hydrogen induced amorphization (HIA) unlike the case of Zr0.2Ho0.8Co2H3 even though the atomic size ratio (R-A/R-B) of Zr0.2Ho0.8CoFe is more than the critical value estimated for the formation of an amorphous state upon hydrogenation. (C) 1998 Elsevier Science S.A. [References: 18]
机译：对具有C15立方Laves相结构的Zr0.2Ho0.8CoFe合金进行了吸氢研究。在小于或等于T（摄氏度）小于或等于150的温度和压力范围27和小于或等于P（bar）小于或等于45的0.05的温度和压力范围内收集数据。在室温下，在43 bar下，每个分子式单元的最大氢浓度为9个氢原子。 P-C等温线显示了两个平稳区域，被确定为（α+β）和（β+γ）相。从热力学参数随氢浓度的变化以及在不同氢浓度下获取的样品的粉末X射线衍射图可以确定。发现氢的相对部分摩尔焓（）和熵（H（H））（Δ）在-（1-8）kJ（ mol H）（-1）和-（13-22）J K-1（mol H）（-1）。在室温下最大氢浓度下，发现晶胞体积膨胀（Delta V / V）高达22％，而晶体结构没有变化。尽管Zr0.2Ho0.8CoFeH9的原子尺寸比（RA / RB）与Zr0.2Ho0.8Co2H3的情况不同，但Zr0.2Ho0.8CoFeHH9的粉末X射线衍射图并不表明发生了氢致非晶化（HIA）。大于估计的氢化后形成非晶态的临界值。 （C）1998 Elsevier Science S.A. [参考文献：18]

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