摘要
研究了V40-Fe8-Ti-Cr（Ti／Cr=0．95～1．20）四元合金的结构及吸放氢性能。结果表明：不同Ti／Cr比的合金均为bcc单相结构，随着Ti／Cr比的降低，合金的晶格常数降低，平台压升高，吸氢量降低，放氢量先增加后降低；当Ti／Cr为1时，得到合金V40Ti26Cr26Fe8在298K下具有最大的放氢量2．4％（质量分数），平台压为0．24MPa。通过计算得到V40Ti26Cr26Fe8的焓变△H和熵变△S分别为-39．6kJ·mol^-1H和-140．3J·mol^-1·K^-1，在423K下的放氢平台压力可达27．5MPa。
The structures and hydrogen absorption-desorption properties of V40-Fe8-Ti-Cr（Ti/Cr=0.95～1.20） alloys were investigated. All the studied alloys are single-phase with bcc structure. With the decrease of Ti/Cr ratio, the lattice parameters decrease, plateau pressures increase, and hydrogen absorption capacities increase first, then decrease. The V40Ti26Cr26Fe8 alloy with a Ti/Cr ratio of 1.00 has the maximum hydrogen desorption capacity of 2.4% mass fraction with a plateau pressure of 0.24 MPa at 298 K. AH and AS of the V40Ti26Cr26Fes alloy are -39.6 kJ.mol^-1H and -140.3 J·mol^-1·K^-1, respectively, and its plateau pressure at 423 K is calculated to be 27.5 MPa.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第5期816-820,共5页
Rare Metal Materials and Engineering
基金
国家863项目(2007AA05Z114)
作者简介
童桂容，女，1983年生，硕士生，四川大学化工学院，电话：028-85466916，E-mail：guirong．t@163．com；
通讯作者：陈云贵，教授，E-mail：ygchen60@yahoo．com．cn
