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Abstract <p>RE magnesium hexaaluminates with magnetoplumbite structure are considered as potential candidates for thermal barrier coatings. However, the synthesis of single-phase samples is associated with certain difficulties. In this work, the features of the preparation of PrMgAl<sub>11</sub>O<sub>19</sub> by reverse precipitation and citrate sol-gel synthesis are compared. Based on the results of thermal analysis of precursors, stepwise annealing of the samples has been carried out, followed by X-ray diffraction studies of the product. It is shown that the optimal condition for producing single-phase hexaaluminate PrMgAl<sub>11</sub>O<sub>19</sub> is long-term annealing of tableted precursors obtained by the sol-gel method at a temperature of 1600°C. Thermodynamic assessment of possible reactions of praseodymium magnesium hexaaluminate formation from oxides confirmed the decomposition of PrMgAl<sub>11</sub>O<sub>19</sub> at temperatures above 1700°C.</p>

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Features of Synthesis of Magnesium Praseodymium Hexaaluminate PrMgAl11O19 with a Magnetoplumbite Structure

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • M. A. Ryumin,
  • G. E. Nikiforova,
  • P. G. Gagarin,
  • O. N. Kondrat’eva,
  • K. S. Gavrichev

摘要

Abstract

RE magnesium hexaaluminates with magnetoplumbite structure are considered as potential candidates for thermal barrier coatings. However, the synthesis of single-phase samples is associated with certain difficulties. In this work, the features of the preparation of PrMgAl11O19 by reverse precipitation and citrate sol-gel synthesis are compared. Based on the results of thermal analysis of precursors, stepwise annealing of the samples has been carried out, followed by X-ray diffraction studies of the product. It is shown that the optimal condition for producing single-phase hexaaluminate PrMgAl11O19 is long-term annealing of tableted precursors obtained by the sol-gel method at a temperature of 1600°C. Thermodynamic assessment of possible reactions of praseodymium magnesium hexaaluminate formation from oxides confirmed the decomposition of PrMgAl11O19 at temperatures above 1700°C.