Thermodynamic Properties of Lutetium Stannate Lu2Sn2O7 in the Temperature Range 0–1871 K

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Resumo

Lutetium stannate with a pyrochlore structure was synthesized using solid state reaction route. The heat capacity of the polycrystalline Lu2Sn2O7 in the temperature range 7.99–1871 K was measured by adiabatic and differential scanning calorimetry methods. Entropy, enthalpy change, and derived Gibbs energy were calculated from the smoothed heat capacity data. The Gibbs free energy of Lutetium stannate from simple substances was estimated, using the ΔfS°(Т) values obtained in this work and the ΔfH°(Т) values from the literature. The temperature dependence of the cubic crystal lattice parameter and the value of the coefficient of thermal expansion in the temperature range 300–1273 K were determined by high-temperature X-ray diffraction.

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Sobre autores

M. Ryumin

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: ryumin@igic.ras.ru
Rússia, Moscow

A. Tyurin

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: ryumin@igic.ras.ru
Rússia, Moscow

A. Khoroshilov

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: ryumin@igic.ras.ru
Rússia, Moscow

G. Nikiforova

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: ryumin@igic.ras.ru
Rússia, Moscow

K. Gavrichev

Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences

Email: ryumin@igic.ras.ru
Rússia, Moscow

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3. Fig. 1. Microphotographs of lutetium stannate after annealing at 1773 K

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4. Fig. 2. Diffractogram of Lu2Sn2O7

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5. Fig. 3. EDX spectrum of stannate lutetium stannate

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6. Fig. 4. Heat capacity of lutetium stannate: grey line - curve obtained in the present work; black squares - values obtained by addition of heat capacities of initial oxides (Neumann-Kopp rule); black line - values [23]. Dashed line in the tab - heat capacity of gadolinium stannate

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7. Fig. 5. Temperature dependence of Gibbs energy of lutetium stannate formation from oxides

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