Heat capacity and thermodynamic functions of lutetium titanate Lu2Ti2O7

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The heat capacity of lutetium titanate was measured in the temperature range 2–1869 K and the smoothed temperature dependences of heat capacity entropy enthalpy changes and reduced Gibbs energy were calculated. The presence of a gentle anomaly in the heat capacity of Lu2Ti2O7 in the low temperature range was confirmed and its parameters were determined. Based on the calculated values of Gibbs energy thermodynamic stability in the studied temperature range was estimated.

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作者简介

P. Gagarin

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

编辑信件的主要联系方式.
Email: gagarin@igic.ras.ru
俄罗斯联邦, Leninsky prospect, 31, Moscow, 119991

A. Guskov

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

Email: gagarin@igic.ras.ru
俄罗斯联邦, Leninsky prospect, 31, Moscow, 119991

V. Guskov

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

Email: gagarin@igic.ras.ru
俄罗斯联邦, Leninsky prospect, 31, Moscow, 119991

A. Khoroshilov

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

Email: gagarin@igic.ras.ru
俄罗斯联邦, Leninsky prospect, 31, Moscow, 119991

K. Gavrichev

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

Email: gagarin@igic.ras.ru
俄罗斯联邦, Leninsky prospect, 31, Moscow, 119991

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2. Fig. 1. Diffraction pattern of a Lu2Ti2O7 sample with a pyrochlore structure.

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3. Fig. 2. Surface morphology of a lutetium titanate sample.

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4. Fig. 3. EDX spectrum of a lutetium titanate sample.

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5. Fig. 4. Difference between experimental values ​​of heat capacity of Lu2Ti2O7 measured in STA 449F1 Jupiter and DSC404F1 Pegasus (Netzsch) installations.

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6. Fig. 5. Comparison of the dependences of the high-temperature heat capacity of Lu2Ti2O7 obtained in this work (1) with the data of [17] (2) and the values ​​calculated according to the Neumann–Kopp rule (3).

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7. Fig. 6. Excess heat capacity (a) and excess entropy (b) of Lu2Ti2O7 in the low temperature region.

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8. Fig. 7. Temperature dependences of the enthalpy of formation ∆fHox and the Gibbs energy of formation from oxides according to reaction (5) in the high-temperature region: 1 – enthalpy of reaction, 2 – Gibbs energy of reaction.

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