Heat Capacity And Thermal Expansion Of LaMgAl11O19

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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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作者简介

P. Gagarin

Kurnakov Institute of General and Inorganic Chemistry of RAS

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

A. Guskov

Kurnakov Institute of General and Inorganic Chemistry of RAS

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

V. Guskov

Kurnakov Institute of General and Inorganic Chemistry of RAS

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

G. Nikiforova

Kurnakov Institute of General and Inorganic Chemistry of RAS

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

K. Gavrcihev

Kurnakov Institute of General and Inorganic Chemistry of RAS

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

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1. JATS XML
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2. Supplement
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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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