Citation: GAO Xiao-Han, XU Pei, DUAN Wen-Chao, LÜ Xue-Chuan, TAN Zhi-Cheng, LU Qiang. Low-Temperature Heat Capacity and Thermodynamic Functions of Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O[J]. Acta Physico-Chimica Sinica, ;2013, 29(10): 2123-2128. doi: 10.3866/PKU.WHXB201306051 shu

Low-Temperature Heat Capacity and Thermodynamic Functions of Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O

1.
1 School of Chemistry and Material Science, College of Chemistry and Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning Province, P. R. China;
2 Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, Liaoning Province, P. R. China

Received Date: 15 March 2013
Available Online: 5 June 2013
Fund Project: 国家自然科学基金(21103078, 21003069)资助项目 (21103078, 21003069)

A complex of a rare-earth metal (Ho) nitrate with glycine (C₂H₅O₂N), Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O, was synthesized, and characterized by chemical analysis, elemental analysis, and infrared (IR) spectroscopy. The thermodynamic properties of the complex were also studied. The low-temperature molar heat capacities at constant pressure (C_p,m) of the complex were measured using a high-precision automatic adiabatic calorimeter over the temperature range from80 to 390 K. The experimental molar heat capacities at constant pressure were used to deduce the polynomial equations for the heat capacity as a function of reduced temperature by applying the least-squares method to the two smooth stages of the curve. Based on the thermodynamic relationships among heat capacity, entropy, and enthalpy, the thermodynamic functions (H_T,m-H_298.15,m) and (S_T,m-S_298.15,m) were derived from the heat capacity data, with temperature intervals of 5 K. The molar enthalpy and entropy changes of the transition process at about 350 K (Δ_trsH_m and Δ_trsS_m) were calculated from the heat capacity curve. The thermal stability of the complex was determined using differential scanning calorimetry (DSC).
- Rare earth complex,
- Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O,
- Adiabatic calorimetry,
- Heat capacity,
- Thermodynamic function,
- Thermal analysis
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Low-Temperature Heat Capacity and Thermodynamic Functions of Ho(NO3)3(C2H5O2N)4·H2O

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通讯作者: 陈斌, bchen63@163.com

Low-Temperature Heat Capacity and Thermodynamic Functions of Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O