Heat capacity of magnesium-neodymium hexaaluminate NdMgAl₁₁O₁₉

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Abstract

Heat capacity of magnesium-neodymium hexaaluminate NdMgAl11O19 with the magnetoplumbite structure is measured by relaxation, adiabatic, and differential scanning calorimetry in the temperature range 2-1850 K. Smoothing of the data is carried out after matching the temperature dependences of the heat capacity obtained by different methods. Thermodynamic functions (entropy and enthalpy change) are calculated, and the anomalous Schottky heat capacity in the low temperature region is estimated.

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About the authors

P. G. Gagarin

N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

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

A. V. Guskov

N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

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

V. N. Guskov

N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

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

M. A. Ryumin

N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

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

G. E. Nikiforova

N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

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

K. S. Gavrichev

N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences

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

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2. Fig. 1. Diffraction pattern of neodymium magnesium hexaaluminate powder after annealing at 1700°C.

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3. Fig. 2. Type of temperature dependence of the heat capacity of NdMgAl₁₁O₁₉: ■ – relaxation calorimetry, ○ – adiabatic calorimetry, ▲ – differential scanning calorimetry.

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4. Fig. 3. Relative deviations of experimental values ​​of heat capacity of NdMgAl₁₁O₁₉ from smoothed values: ■ – relaxation calorimetry, ○ – adiabatic calorimetry, ▲ – differential scanning calorimetry.

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5. Fig. 4. Anomalous heat capacity of NdMgAl₁₁O₁₉: 1 – difference between the heat capacities of NdMgAl₁₁O₁₉ and LaMgAl11O19, 2 – excess heat capacity calculated for the energy levels of 71 cm⁻¹ and 250 cm⁻¹; vertical dashes show the 1% error corridor (a) and the anomalous heat capacity of NdMgAl₁₁O₁₉ in the temperature range of 2–20 K, calculated using equation (5) (b).

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