Low temperature heat capacities and thermodynamic properties of rare earth triisothiocyanate hydrates——Pr(NCS)_3· 7H_2O and Nd(NCS)_3· 7H_2O  

作　　者：谭志诚 Matsuo Takasuke Suga Hiroshi 张志英 尹敬执 蒋本杲 孙同山 

机构地区：[1]Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China [2]Microcalorimetry Research Center,Faculty of Scienoes, Osaka University, Toyonaka, Osaka 560, Japan [3]Thermochemistry Laboratory, Northwestern University, Xi' an 710069, China [4]Department of Chemistry, Shandong University, Jinan 250100, China

出　　处：《Science China Chemistry》1996年第3期276-284,共9页中国科学（化学英文版）

基　　金：Project supported by the National Natural Science Foundation of China

摘　　要：Heat capacities of Pr(NCS)3·7H2O and Nd(NCS)3· 7H2O haw been measured from 13 to 300 K by using a fully automated adiabatic calorimeter. Schottky anomaly was observed for Pr(NCS)3·7H2O below 50 K. The polynomial equations for calculating the heat capacity values of the two compounds in the range of 13-300 K were obtained by the least-squares fitting based on the experimental Cp data. The Cp values below 13 K were estimated by using the Debye-Einstein and Schottky heat capacity functions. The standard molar thermodynamic functions were computed from 0 to 300 K. The standard entropies and Gibbs energies of formation of the two compounds were also calculated.Heat capacities of Pr(NCS)3·7H2O and Nd(NCS)3· 7H2O haw been measured from 13 to 300 K by using a fully automated adiabatic calorimeter. Schottky anomaly was observed for Pr(NCS)3·7H2O below 50 K. The polynomial equations for calculating the heat capacity values of the two compounds in the range of 13-300 K were obtained by the least-squares fitting based on the experimental Cp data. The Cp values below 13 K were estimated by using the Debye-Einstein and Schottky heat capacity functions. The standard molar thermodynamic functions were computed from 0 to 300 K. The standard entropies and Gibbs energies of formation of the two compounds were also calculated.

关 键 词：heat capacity thermodynamic functions rare earth Pr(NCS)3·7H2O Nd(NCS)3·7H2O. 

分 类 号：O642[理学—物理化学]