摘要
在４４８～６２３Ｋ温度范围内，由实验测得氢的平衡分压与组分变化的关系，从Ｖｏｎ＇ｔＨｏｆｆ曲线可计算得到，连续固溶体（组分范围为ｎ＝２～２．５／Ｓｍ）中相关偏摩尔焓和相关偏摩尔熵值。氢原子和八面体空隙之间的相互作用能是负值（４～８ｋＪ／ｍｏｌ），表明它们之间相互吸引；从二相共存区氢平衡分解压与温度、用分的关系计算得到了非富氢区域六方ＳｍＨ＿３生成的相关摩尔焓和摩尔熵值；由于本实验创造了一个极高纯度，无污染的实验条件，结果表明本实验数据表现的滞后现象较先前发表的结果小６．５倍。
Equilibrium hydrogen dissociation pressure was measured as a function of composition and temperature for the samarium-hydrogen system in the range of 448 to 623 K. Relative partial enthalpies and entropies in the composition region of continuous solution from n=2 to 2.5atoms H/atom Sm have been evaluated from van't Hoff plots.The interaction energy between hydrogen atoms and octahedral interstices is negative(4～8kJ/mol)indicating attractive interaction.The rel-ative molar enthalpy and entropy of formation of of hydrogen-deficient hexagonal SmH_3 have been to the extreme high-purity conditions,the hysteresis found in this work is 6. 5 times less than that found in the past.
出处
《钢铁》
CAS
CSCD
北大核心
1995年第S1期50-56,共7页
Iron and Steel
关键词
稀土钐
氢化物
热力学
samarium,hydrides,thermodynamics
