Heat Capacity And Thermal Expansion Of LaMgAl11O19

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Abstract

The heat capacity of LaMgAl11O19 with a magnetoplumbite structure was measured in the temperature range of 7–1865 K using relaxation, adiabatic and differential scanning calorimetries. Obtained temperature dependences of the heat capacity are consistent based on adiabatic calorimetry data. Thermodynamic functions (entropy, enthalpy change, reduced Gibbs energy) in the range 0–1865 K are calculated from fitted values. Thermal expansion in the range of 300-1200 K was studied by high-temperature X-ray diffraction and the coefficient of thermal expansion of LaMgAl11O19 was calculated.

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About the authors

P. G. Gagarin

Kurnakov Institute of General and Inorganic Chemistry of RAS

Author for correspondence.
Email: gagarin@igic.ras.ru
Russian Federation, Leninsky pr. 31, Moscow, 119991

A. V. Guskov

Kurnakov Institute of General and Inorganic Chemistry of RAS

Email: gagarin@igic.ras.ru
Russian Federation, Leninsky pr. 31, Moscow, 119991

V. N. Guskov

Kurnakov Institute of General and Inorganic Chemistry of RAS

Email: gagarin@igic.ras.ru
Russian Federation, Leninsky pr. 31, Moscow, 119991

G. E. Nikiforova

Kurnakov Institute of General and Inorganic Chemistry of RAS

Email: gagarin@igic.ras.ru
Russian Federation, Leninsky pr. 31, Moscow, 119991

K. S. Gavrcihev

Kurnakov Institute of General and Inorganic Chemistry of RAS

Email: gagarin@igic.ras.ru
Russian Federation, Leninsky pr. 31, Moscow, 119991

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Supplementary files

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3. Fig. 1. Diffractogram of the LaMgAl11O19 sample.

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4. Fig. 2. Morphology of the LaMgAl11O19 surface after annealing at 1973 K.

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5. Fig. 3. Consistent dependences of the LaMgAl11O19 heat capacity determined by relaxation (O), adiabatic (o) and differential scanning calorimetry (O) methods.

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6. Fig. 4. Change in the parameters of the unit cell (a, c, V) LaMgAl11O19 in the range 298-1173 K.

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