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Chin. Phys. B, 2012, Vol. 21(8): 080702    DOI: 10.1088/1674-1056/21/8/080702
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Crystal structure and thermochemical properties of phase change materials bis(1-octylammonium) tetrachlorochromate

Lu Dong-Fei (卢冬飞), Di You-Ying (邸友莹), He Dong-Hua (何东华 )
Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng 252059, China
Abstract  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.
Keywords:  bis(1-octylammonium) tetrachlorochromate      X-ray crystallography      phase change materials      low-temperature heat capacity      solid-solid phase transition  
Received:  29 November 2011      Revised:  20 February 2012      Accepted manuscript online: 
PACS:  07.20.Mc (Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment)  
  61.50.Ks (Crystallographic aspects of phase transformations; pressure effects)  
  64.70.K-  
  67.25.bd (Thermodynamic properties)  
Fund: Project supported by the National Natural Science Foundations of China (Grant Nos. 20673050 and 20973089).
Corresponding Authors:  Di You-Ying     E-mail:  diyouying@126.com, diyouying@lcu.edu.cn

Cite this article: 

Lu Dong-Fei (卢冬飞), Di You-Ying (邸友莹), He Dong-Hua (何东华 ) Crystal structure and thermochemical properties of phase change materials bis(1-octylammonium) tetrachlorochromate 2012 Chin. Phys. B 21 080702

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