Ho(NO3)3(C2H5O2N)4·H2O的低温热容和热力学函数

doi:10.3866/PKU.WHXB201306051

Abstract

Abstract:

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).

Key words: Rare earth complex, Ho(NO₃)₃(C₂H₅O₂N)₄·H₂O, Adiabatic calorimetry, Heat capacity, Thermodynamic function, Thermal analysis

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 Phys. -Chim. Sin. 2013, 29(10), 2123-2128. doi: 10.3866/PKU.WHXB201306051

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

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