Heat Capacity And Thermal Expansion Of LaMgAl11O19

P. G. Gagarin; Гагарин П. Г.; A. V. Guskov; Гуськов А. В.; V. N. Guskov; Гуськов В. Н.; G. E. Nikiforova; Никифорова Г. Е.; K. S. Gavrcihev; Гавричев К. С.

doi:10.31857/S0044457X24060089

Heat Capacity And Thermal Expansion Of LaMgAl11O19

作者: Gagarin P.G.¹, Guskov A.V.¹, Guskov V.N.¹, Nikiforova G.E.¹, Gavrcihev K.S.¹
隶属关系:
1. Kurnakov Institute of General and Inorganic Chemistry of RAS
期: 卷 69, 编号 6 (2024)
页面: 866-873
栏目: ФИЗИЧЕСКИЕ МЕТОДЫ ИССЛЕДОВАНИЯ
URL: https://journals.rcsi.science/0044-457X/article/view/273150
DOI: https://doi.org/10.31857/S0044457X24060089
EDN: https://elibrary.ru/XTGLKG
ID: 273150

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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.

关键词

hexaaluminate, magnetoplumbite, heat capacity, thermodynamics, thermal expansion

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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.