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Tytuł:
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Thermal expansion and heat capacities of holmium and erbium orthotantalates ceramics.
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Autorzy:
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Gagarin, Pavel G.
Guskov, Anton V.
Guskov, Vladimir N.
Tyurin, Aleksandr V.
Khoroshilov, Andrey V.
Gavrichev, Konstantin S.
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Temat:
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THERMAL expansion
HEAT capacity
HOLMIUM
X-ray powder diffraction
THERMODYNAMIC functions
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Źródło:
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Journal of the American Ceramic Society; Jan2021, Vol. 104 Issue 1, p472-480, 9p, 5 Charts, 6 Graphs
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Monoclinic M‐orthotantalates of holmium and erbium ceramics were obtained by co‐precipitation and annealing at 1773 K and characterized by X‐ray powder diffraction, scanning electron microscopy, and chemical analysis. Using the high‐temperature X‐ray diffraction method, the temperature dependence of the monoclinic lattice parameters of both ceramics were determined at range 298‐1273 K. The molar heat capacity of M‐HoTaO4 and M‐ErTaO4 were measured by adiabatic (7‐350 K) and differential scanning (320‐1350 K) calorimetry. Standard thermodynamic function (entropy, enthalpy change, and reduced Gibbs energy) were calculated on the smoothed values of molar capacity, without taking into account contribution of low‐temperature interval: 0‐7 K for M‐HoTaO4 and 0‐8 K for M‐ErTaO4. The general shape of the anomalous Schottky contribution to the molar heat capacity was determined. [ABSTRACT FROM AUTHOR]
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