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Thermal Expansion and Thermodynamic Properties of Gadolinium Hafnate Ceramics by Guskov, V.N.; Tyurin, A.V.; Guskov, A.V.; Gagarin, P.G.; Khoroshilov, A.V.; Gavrichev, K.S. is a Materials Science article available to read on EtoBox.

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Gadolinium hafnate samples were obtained by co-precipitation and precursor annealing at a temperature of ~1773 K and characterised by X-ray powder diffraction, scanning electron microscopy and chemical analysis. The molar heat capacity of Gd 2 Hf 2 O 7 ceramics with a pyrochlore structure was measured by adiabatic (8-340 K) and differential scanning calorimetry (315-1345 K). The heat capacity of gadolinium hafnate was extrapolated to 0 K without taking into account anomalies in the temperature range below 20 K. Standard thermodynamic functions were calculated based on the smoothed values of molar heat capacity: entropy, enthalpy change and reduced Gibbs energy. Using the high-temperature X-ray diffraction method, the temperature dependence of the Gd 2 Hf 2 O 7 cubic crystal lattice parameter was determined in the range of 298-1273 K and coefficients of instantaneous (α i ), relative (α r ) and linear thermal expansion (TE) were calculated.

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Author

Guskov, V.N.; Tyurin, A.V.; Guskov, A.V.; Gagarin, P.G.; Khoroshilov, A.V.; Gavrichev, K.S.

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0272-8842)

Published

2020

Language

EN

Field

Materials Science (Physical Sciences)