Thermodynamic and thermophysical properties of holmium orthovanadate

• Published in: Journal of alloys and compounds 2021-04, Vol.859, p.157786, Article 157786
• Main Authors: Kondrat’eva, Olga N., Nikiforova, Galina E., Tyurin, Alexander V., Smirnova, Maria N., Gavrichev, Konstantin S.
• Format: Article
• Language: English
• Subjects: Ambient temperature; Calorimetry; Differential scanning calorimetry; Diffusivity; Entropy; Evaluation; Free energy; Heat; Heat capacity; Heat conduction; Heat measurement; Heat of formation; Holmium; Low temperature; Rare earth alloys and compounds; Specific heat; Temperature; Thermal conductivity; Thermal diffusivity; Thermodynamic properties; Thermophysical properties
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2020.157786

The current paper reports thermodynamic and thermophysical property data on holmium orthovanadate over a wide temperature range. The heat capacities of HoVO4 have been measured using precision adiabatic calorimetry and differential scanning calorimetry over the temperature ranges of 7–343 K and 337–1097 K, respectively. A broad heat capacity anomaly, centred at 15 K, has been observed. The standard entropy of HoVO4 at 298.15 K, derived from low-temperature heat capacity data, has been estimated. This value, in conjunction with available thermodynamic data, has been used to evaluate the standard Gibbs energy of formation of HoVO4 from the elements. The temperature dependences of standard thermodynamic properties have been calculated from 0 K to 1100 K. Thermal diffusivity measurements for HoVO4 have been conducted from ambient temperature to 1073 K, using a laser flash method. The thermal conductivity has been evaluated on the basis of the heat capacity and thermal diffusivity data obtained. [Display omitted] •Heat capacity of HoVO4 was investigated using adiabatic calorimetry and DSC.•A broad heat capacity anomaly centred at about 15 K was observed.•Standard thermodynamic functions of HoVO4 were calculated in the range of 0–1100 K.•Thermal diffusivity measurements were performed using the laser flash method.•Thermal conductivity of HoVO4 was estimated in the range of 300–1100 K.