中国物理B ›› 2012, Vol. 21 ›› Issue (8): 80702-080702.doi: 10.1088/1674-1056/21/8/080702
卢冬飞, 邸友莹, 何东华
Lu Dong-Fei (卢冬飞), Di You-Ying (邸友莹), He Dong-Hua (何东华 )
摘要: A new crystalline complex (C8H17NH3)2CdCl4(s) (abbreviated as C8Cd(s)) is synthesized by liquid phase reaction. The crystal structure and composition of the complex are determined by single crystal X-ray diffraction, chemical analysis, and elementary analysis. It is triclinic, the space group is P-1 and Z = 2. The lattice potential energy of the title complex is calculated to be UPOT (C8Cd(s))=978.83 kJ·mol-1 from crystallographic data. Low-temperature heat capacities of the complex are measured by a precision automatic adiabatic calorimeter over a temperature range from 78 K to 384 K. The temperature, molar enthalpy, and entropy of the phase transition for the complex are determined to be 307.3± 0.15 K, 10.15± 0.23 kJ·mol-1, and 33.05± 0.78 J·K-1·mol-1 respectively for the endothermic peak. Two polynomial equations of the heat capacities each as a function of temperature are fitted by the least-square method. Smoothed heat capacity and thermodynamic functions of the complex are calculated based on the fitted polynomials.
中图分类号: (Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment)