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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-desorption characteristics of the LaNi_5Sn intermetallic compound
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Hydrogen absorption-desorption characteristics of the LaNi_5Sn intermetallic compound

机译:LaNi_5Sn金属间化合物的氢吸收-解吸特性

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The pressure-composition-temperature (P-C-T) relations in the LaNi_5 Sn-H system were measured volumetrically at temperatures between 258 and 423 K. Two hydride phases, beta-LaNi_5SnE_2 and gamma-LaNi_5SnH_3 are formed in this system in addition to the alpha-solid solution with a limiting H content of 0.3 H atoms per formula unit. The calculated work loss due to hysteresis is rather small, 112 J (mol H)~(-1) at 298 K. The partial molar enthalpy and entropy calculated for the formation of the beta-LaNi_5SnH_2 are -18.5 +- 0.8 kJ (mol H)~(-1) and -53.7 +- 2.3 J(K mol H)~(-1), respectively. An advanced van der Waals lattice gas model was applied to fit the isotherms. The critical temperature of the LaNi_5SnH_2 equals T_C =421 +- 17K.
机译:在258和423 K之间的温度下,对LaNi_5 Sn-H系统中的压力-温度-温度(PCT)关系进行了体积测量。除α-外,在该系统中还形成了两个氢化物相β-LaNi_5SnE_2和γ-LaNi_5SnH_3。固溶体,每个分子式单元的H含量极限为0.3 H计算出的由于磁滞引起的功损耗相当小,在298 K时为112 J(mol H)〜(-1)。为形成β-LaNi_5SnH_2所计算的部分摩尔焓和熵为-18.5 +-0.8 kJ(mol H)〜(-1)和-53.7 +-2.3 J(K mol H)〜(-1)。应用了先进的范德华格子气体模型来拟合等温线。 LaNi_5SnH_2的临界温度等于T_C = 421±17K。

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