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Abstract <p>The heat capacity of magnetoplumbite-type PrZnAl<sub>11</sub>O<sub>19</sub> was measured by relaxation, adiabatic, and differential scanning calorimetry techniques in the temperature range 2–1848 K. The smoothed heat capacity values were used to calculate the temperature-dependent entropy, enthalpy change, and reduced Gibbs free energy. The enthalpy of solution in lead borate melt at 1073 K was measured by drop-solution calorimetry, and the enthalpy of formation from binary oxides and standard enthalpy of formation at 298 K were estimated. To determine the probability of PrZnAl<sub>11</sub>O<sub>19</sub> decomposition to binary oxides, the temperature-dependent Gibbs free energy of the solid-phase reaction in the temperature range 298–1800 K was estimated.</p>

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Thermodynamic Properties of PrZnAl11O19 Hexaaluminate

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • P. G. Gagarin,
  • A. V. Guskov,
  • V. N. Guskov,
  • M. A. Ryumin,
  • I. A. Bazhenova,
  • S. V. Kuzovchikov,
  • K. S. Gavrichev

摘要

Abstract

The heat capacity of magnetoplumbite-type PrZnAl11O19 was measured by relaxation, adiabatic, and differential scanning calorimetry techniques in the temperature range 2–1848 K. The smoothed heat capacity values were used to calculate the temperature-dependent entropy, enthalpy change, and reduced Gibbs free energy. The enthalpy of solution in lead borate melt at 1073 K was measured by drop-solution calorimetry, and the enthalpy of formation from binary oxides and standard enthalpy of formation at 298 K were estimated. To determine the probability of PrZnAl11O19 decomposition to binary oxides, the temperature-dependent Gibbs free energy of the solid-phase reaction in the temperature range 298–1800 K was estimated.