Thermodynamic and structural investigation of caesium-nickel monophosphate CsNiPO4

Add time:09/04/2019    Source:sciencedirect.com

The heat capacity function Cp,mo=fT of crystalline CsNiPO4 was measured between 6 K and 650 K. A heat capacity anomaly was found around 382.8 K due to a phase transition. The experimental data obtained were used to calculate the standard thermodynamic functions Cp,mo/R, Δ0THmo/RT, Δ0TSmo/R and Φmo/R in the range from T = (5 to 650) K, and the standard entropy of formation at 298.15 K. The fractal dimension of CsNiPO4 was calculated from experimental data on the low-temperature (6 ≤ T ≤ 50) K heat capacity and the topology of the phosphate structure was estimated. The crystal structure of caesium-nickel monophosphate was investigated. Thermal expansion parameters were determined with high-temperature X-ray diffraction measurements in the temperature range from T = (473 to 1073) K.

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