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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 >Hydriding properties of Ti-substituted non-stoichiometric AB_2 alloys
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Hydriding properties of Ti-substituted non-stoichiometric AB_2 alloys

机译：钛取代的非化学计量AB_2合金的氢化性能

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摘要

Stoichiometric Ti_(0.1)Zr_(0.9)Mn_(0.9)V_(0.1)Fe_(0.5)Co_(0.5) and non-stoichiometry (Ti_(0.1)Zr_(0.9))_(1.1)Mn_(0.9)V_(0.1)Fe_(0.5)Co_(0.5), Ti_(0.1)Zr_(0.9)(Mn_(0.9)V_(0.1))_(1.1)Fe_(0.5)Co_(0.5) and Ti_(0.1)Zr_(0.9)Mn_(0.9)V_(0.1)Fe_(0.55)Co_(0.55)alloys have been synthesized and the lattice constants and unit cell volume have been obtained by using powder X-ray diffractograms. Pressure-composition (PC) isotherms have been obtained in the temperature and pressure ranges 30-125 deg C and 0, 1-30 bar using pressure reduction method and the effect of non-stoichiometry on the hydrogen absorption properties have been studied. Maximum hydrogen storage capacity is around 3.4 hydrogen atoms per formula unit at 30 bar and 30 deg C in Ti_(0.1)Zr_(0.9)Mn_(0.9)V_(0.1)Fe_(0.5)Co_(0.5) The relative partial molar enthalpy (DELTA H_H) and relative partial molar entropy (DELTA S_H) of the dissolved hydrogen have been calculated from the PC isotherms and their variation with hydrogen concentration has been plotted to identify the existence of different phases. The powder X-ray diffraction patterns of Ti_(0.1)Zr_(0.9)Mn_(0.9)V_(0.1)Fe_(0.5)Co_(0.5)-H_x (x = 1.6 and 3.2) have been obtained in order to study the effect of hydrogenation on the crystal structure. The activation energy and diffusion coefficient of dissolved hydrogen in Ti_(0.1)Zr_(0.9)Mn_(0.9)V_(0.1)Fe_(0.5)Co_(0.5) have been calculated from the kinetics of hydrogen absorption measurements at different temperatures and compared with Ti_(0.1)Zr_(0.9)Mn_(0.9)V_(0.1)Fe_(0.5)Co_(0.5).The effect of non-stoichiometry on the kinetics of hydrogen absorption at 50 deg C has been studied and discussed.
机译：化学计量的Ti_（0.1）Zr_（0.9）Mn_（0.9）V_（0.1）Fe_（0.5）Co_（0.5）和非化学计量的（Ti_（0.1）Zr_（0.9））_（1.1）Mn_（0.9）V_（0.1 Fe_（0.5）Co_（0.5），Ti_（0.1）Zr_（0.9）（Mn_（0.9）V_（0.1））_（1.1）Fe_（0.5）Co_（0.5）和Ti_（0.1）Zr_（0.9）Mn_合成了（0.9）V_（0.1）Fe_（0.55）Co_（0.55）合金，并通过粉末X射线衍射图获得了晶格常数和晶胞体积。使用减压法在30-125摄氏度和0、1-30巴的温度和压力范围内获得了压力成分（PC）等温线，并研究了非化学计量法对氢吸收性能的影响。在30 bar和30摄氏度的Ti_（0.1）Zr_（0.9）Mn_（0.9）V_（0.1）Fe_（0.5）Co_（0.5）中，最大氢存储容量约为每个配方单元3.4个氢原子（相对分子摩尔焓（已根据PC等温线计算了溶解氢的DELTA H_H）和相对部分摩尔熵（DELTA S_H），并绘制了它们随氢浓度的变化曲线，以识别不同相的存在。为了研究效果，获得了Ti_（0.1）Zr_（0.9）Mn_（0.9）V_（0.1）Fe_（0.5）Co_（0.5）-H_x（x = 1.6和3.2）的粉末X射线衍射图。对晶体结构的影响根据不同温度下的吸氢动力学计算出Ti_（0.1）Zr_（0.9）Mn_（0.9）V_（0.1）Fe_（0.5）Co_（0.5）中溶解氢的活化能和扩散系数。 Ti_（0.1）Zr_（0.9）Mn_（0.9）V_（0.1）Fe_（0.5）Co_（0.5）。研究了非化学计量比对50℃下氢吸收动力学的影响。

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