Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (08): 1378-1382.doi: 10.3866/PKU.WHXB20080809

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Low-Temperature Heat Capacities and Thermochemistry Properties of Sm(Val)Cl3·6H2O

ZHANG Jing-Nan; TAN Zhi-Cheng; LIU Bei-Ping; SHI Quan; TONG Bo   

  1. Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China; Department of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, Hunan Province, P. R. China; Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China
  • Received:2008-03-04 Revised:2008-03-19 Published:2008-08-06
  • Contact: TAN Zhi-Cheng

Abstract: Heat capacities of the complex of rare-earth element with valine [Sm(Val)Cl3·6H2O] were measured with a high-precision automatic adiabatic calorimeter over the temperature range from 80 to 376 K, and the thermodynamic unctions (HT-H298.15 and ST-S298.15) were calculated. A large step in heat capacity was detected around 308Kand 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.

Key words: Rare-earth complex, Sm(Val)Cl3·6H2O, Low-temperature heat capacity, Thermodynamic functions, TG analysis