Low-temperature heat capacities of crystalline Ho(Gly)_3Cl_3·3H_2O from 78 to 348 K
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：LIU Beiping ZHANG Jingnan WANG Hui SHI Quan TAN Zhicheng TONG Bo
Key words：rare-earth complex; Ho(Gly)_3Cl_3·3H_2O; low-temperature heat capacities; thermodynamic functions;
Abstract: Heat capacities of the rare-earth complex with glycine [Ho(Gly)_3Cl_3·3H_2O] were measured with a high-precision automatic adiabatic calorimeter over the temperature range from 78 to 348 K. In the experimental temperature range, the heat capacities increased in a smooth and continuous manner and no phase transition or thermal anomaly occurred. Therefore, the sample was stable in the above temperature range. The values of experimental heat capacities were fitted to a polynomial equation with least square method and the thermodynamic functions, (H_r-H_(298.15)) and (S_t-E_(298.15)), were calculated.
LIU Beiping1，ZHANG Jingnan2，WANG Hui3，SHI Quan2，TAN Zhicheng2，TONG Bo2
(1.Department of Chemistry,Hunan University of Arts and Science,Chang de 415000,China;
2.Thermochemistry Laboratory,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China;
3.Shanghai Research Institute of Petrochemical Technology,SINOPEC,Shanghai 201208,China;
4.China Ionic Liquids Laboratory,Dalian Institute of Chemical Physics,Chinese Academy of S)
Abstract:Heat capacities of the rare-earth complex with glycine [Ho(Gly)_3Cl_3·3H_2O] were measured with a high-precision automatic adiabatic calorimeter over the temperature range from 78 to 348 K. In the experimental temperature range, the heat capacities increased in a smooth and continuous manner and no phase transition or thermal anomaly occurred. Therefore, the sample was stable in the above temperature range. The values of experimental heat capacities were fitted to a polynomial equation with least square method and the thermodynamic functions, (H_r-H_(298.15)) and (S_t-E_(298.15)), were calculated.
Key words:rare-earth complex; Ho(Gly)_3Cl_3·3H_2O; low-temperature heat capacities; thermodynamic functions;
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