Specific features of the thermodynamics of activation in the LaNi5-H2 and CeNi5-H2 systems

被引：4

作者：

Yakovleva, NA ^{[1
]}

Klyamkin, SN ^{[1
]}

Veremeeva, OA ^{[1
]}

Tsikhotskaya, AA ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119992, Russia

来源：

RUSSIAN CHEMICAL BULLETIN | 2005年 / 54卷 / 01期

基金：

俄罗斯基础研究基金会;

关键词：

intermetallides; hydrides; calorimetry; phase diagrams; hysteresis; activation;

D O I：

10.1007/s11172-005-0228-1

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Using heat conducting Tian-Calvet calorimetry and volumetric measurements, the first hydrogen absorption-desorption cycles in the LaNi5-H-2 and CeNi5-H-2 systems were studied. The pressure-composition isotherms were plotted, the equilibrium pressures of hydrogen along the absorption and desorption branches and in the region of hysteresis for different activation steps were determined, and the enthalpies of phase transitions alpha -> beta and beta -> alpha were calculated. The profiles of the heat evolution curves were analyzed. It was concluded that the mechanism of the reactions studied changes upon activation.

引用

页码：135 / 140

页数：6

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