Thermophysical properties of Dy₆UO₁₂

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• 作者：R. Venkata Krishnan ; R. Babu ; G. Panneerselvam ; K. Ananthasivan ; M.P. Antony ; K. Nagarajan ; ^{knag@igcar.gov.in}
• 关键词：C. Thermal expansion ; Dysprosium uranate ; Enthalpy increment ; Heat capacity ; Thermophysical properties
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：August, 2012
• 卷：38
• 期：6
• 页码：5277-5280
• 文件大小：325 K

摘要

Dysprosium uranate (Dy₆UO₁₂) was prepared by citrate gel combustion and characterized by X-ray diffraction (XRD). A single phase with a rhombohedral structure was observed . The room temperature values of the lattice parameters 鈥?em>am>鈥?and 鈥?em>cm>鈥?were found to be 9.9747 and 9.4370 脜, respectively. Heat capacity and enthalpy increment measurements were carried out by using a differential scanning calorimeter (DSC) and inverse drop calorimetry in the temperature range 298-800 K and 600-1700 K respectively. The thermal expansion characteristics were measured by using High Temperature XRD (HTXRD) in the temperature range 298-1973 K. The heat capacity data of Dy₆UO₁₂ is being reported for the first time and its value at 298 K is 462 J K^鈭? mol^鈭?. The coefficient of lattice thermal expansion in the temperature range 298-1973 K along 鈥?em>am>鈥?and 鈥?em>cm>鈥?axes are 13.28 脳 10^鈭? and 9.35 脳 10^鈭? K^鈭? respectively. These data are being reported for the first time as well.