Heat Capacity and Magnetic Properties of PrMgAl11O19

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Resumo

Isobaric heat capacity of magnesium-praseodymium hexaaluminate PrMgAl11O19 with magnetoplumbite structure was measured by three calorimetric methods in the temperature range 2–1865 K. Heat capacity values were docked and smoothed to calculate thermodynamic functions (entropy, enthalpy change and derived Gibbs energy) in the mentioned temperature region. A gentle anomaly of heat capacity with a maximum of about 8 K was found, its entropy and enthalpy were calculated. Magnetic properties of PrMgAl11O19 have been studied using the method of dynamic magnetic susceptibility in the temperature range 2–300 K. Based on the results of measurements of magnetic properties, an anomaly was found on the imaginary component of dynamic magnetic susceptibility, the temperature range of which is consistent with the area of the anomaly of heat capacity.

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Sobre autores

P. Gagarin

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

Autor responsável pela correspondência
Email: gagarin@igic.ras.ru
Rússia, Moscow, 119991

A. Guskov

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

Email: gagarin@igic.ras.ru
Rússia, Moscow, 119991

V. Guskov

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

Email: gagarin@igic.ras.ru
Rússia, Moscow, 119991

A. Khoroshilov

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

Email: gagarin@igic.ras.ru
Rússia, Moscow, 119991

N. Efimov

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

Email: gagarin@igic.ras.ru
Rússia, Moscow, 119991

K. Gavrichev

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

Email: gagarin@igic.ras.ru
Rússia, Moscow, 119991

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2. Appendix
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3. Fig. 1. Temperature dependence of the heat capacity of PrMgAl11O19.

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4. Fig. 2. Heat capacity in the low-temperature anomaly region: 1 - heat capacity of PrMgAl11O19, 2 - heat capacity of LaMgAl11O19 [27], dashed line - (Cp(LaMgAl11O19) + CSCh (50 cm-1).

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5. Fig. 3. Difference between the heat capacities of PrMgAl11O19 determined in the present work and calculated by the Neumann-Kopp rule: 1 - by relation (5) (∆), 2 - by relation (6) (○). Dashed line 3 corresponds to the difference of 2.5%.

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6. Fig. 4. Temperature dependences of the real (χʹ, empty symbols) and imaginary (χʺ, filled symbols) parts of the dynamic magnetic susceptibility of the PrMgAl11O19 sample in a zero magnetic field at different frequencies. The amplitude of the alternating magnetic field is 1 E.

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7. Fig. 5. Temperature dependences of the imaginary component of the dynamic magnetic susceptibility of the PrMgAl11O19 sample in a 1000 E magnetic field at different frequencies. The amplitude of the alternating magnetic field is 1 E.

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