LaNi_(4.25)Al_(0.75)合金的吸放氚性能研究  

Tritium Absorption-Desorption Characteristics of LaNi_(4.25)Al_(0.75) Alloy

作　　者：王维笃[1] 龙兴贵[1] 程贵钧[1] 彭述明[1] 杨本福[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《原子能科学技术》2005年第6期517-521,共5页Atomic Energy Science and Technology

基　　金：国家自然科学基金重点项目(50121050);国家自然科学基金面上项目(50371079)

摘　　要：在真空系统中,对LaNi4.25Al0.75合金的氘活化特性进行测试。测定了该合金在不同温度下的吸放氚速率曲线和P-C-T曲线,获得了LaNi4.25Al0.75Tx吸、放氚的标准焓值和标准熵值。LaNi4.25Al0.75T2.5合金的生成标准焓值和标准熵值分别为(-31.8±0.8)kJ.mol-1和(-76.5±2.4)J.mol-1.K-1,其解析值分别为(-36.5±0.5)kJ.mol-1和(-84.2±1.5)J.mol-1.K-1。用四极质谱计测定了材料吸附氚气和贮存7 d时释放氚的纯度,并进行了比较。As a part of the program to develop metal hydride technology for storing and processing tritium, the tritium absorption-desorption of LaNi4.25Al0.7 was investigated. The pressure-composition-temperature（P-C-T） and activation characteristics and the absorption-desorption rate of tritium from LaNi4.25Al0.75Tx at different temperature were measured. And relative partial molar enthalpy variation △H^- and entropy variation △S^- for T2 absorption and desorption were calculated from the Van＇t Hoff plots based on the measured P-C-T relations. The calculated values of △H^- and △S^- during the formation of the LaNi4.25Al0.75T2.5 phase are （-31.8±0.8） kJ·mol^-1 and （-76.5±2.4） J·mol^-·K^-1 , respectively, and the values of desorption are （-36.5±0.5） kJ·mol^-1 and （-84.2±1.5） J·mol^-1·K^-1, respectively. Variations in the origin gas tritium and tritium released from 7-day-aged LaNi4.25Al0.75 tritide are analyzed by quadrupole mass spectrometer.

关 键 词：LaNi4.25Al0.75 金属氚化物 P-C-T曲线 热力学参数 

分 类 号：TG139.7[一般工业技术—材料科学与工程]