Sm(Val)Cl_3·6H_2O低温热容及热化学性质  

Low-Temperature Heat Capacities and Thermochemistry Properties of Sm(Val)Cl_3·6H_2O

作　　者：张景楠[1,2] 谭志诚[1] 刘北平[3] 史全[1] 童波[1] 

机构地区：[1]中国科学院大连化学物理研究所材料热化学实验室 [2]中国科学院研究生院,北京100049 [3]湖南文理学院化学化工系

出　　处：《物理化学学报》2008年第8期1378-1382,共5页Acta Physico-Chimica Sinica

基　　金：国家自然科学基金(20373072、20753002)资助项目

摘　　要：采用精密绝热量热计测定了稀土氨基酸配合物[Sm(Val)Cl3·6H2O]在80-376K温区的热容,从实验热容值计算出了热力学函数(HT-H298.15和ST-S298.15).在308K附近,配合物的热容出现一个大的跳跃,可能是其玻璃化转变所致.对该配合物进行热重测试,得到了其可能的分解机理.Heat capacities of the complex of rare-earth element with valine [Sm（Val）C13·6H2O] were measured with a high-precision automatic adiabatic calorimeter over the temperature range from 80 to 376 K, and the thermodynamic unctions （HT-H298.15andST-S298.15） were calculated. A large step in heat capacity was detected around 308 K and this may be attributed to a glass transition corresponding to freezing of structural disorder. Thermal decomposition of this complex as studied by thermogravimetric （TG） technique and a possible mechanism for the decomposition was suggested.

关 键 词：稀土配合物 Sm(Val)C13·6H2O 低温热容 热力学函数 热重分析 

分 类 号：O641.4[理学—物理化学]