Thermophysical properties of Dy6UO12

Abstract

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 (R3¯). The room temperature values of the lattice parameters “a” and “c” were found to be 9.9747 and 9.4370Å, 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 298–800K and 600–1700K respectively. The thermal expansion characteristics were measured by using High Temperature XRD (HTXRD) in the temperature range 298–1973K. The heat capacity data of Dy6UO12 is being reported for the first time and its value at 298K is 462JK−1mol−1. The coefficient of lattice thermal expansion in the temperature range 298–1973K along “a” and “c” axes are 13.28×10−6 and 9.35×10−6K−1 respectively. These data are being reported for the first time as well.