Features of the synthesis of magnesium praseodymium hexaaluminate PrMgAl11O19 with a magnetoplumbite structure

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Аннотация

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 PrMgAl11O19 preparation by reverse precipitation and citrate sol-gel synthesis are compared. Based on the results of thermal analysis of precursors, stepwise annealing of the samples was carried out, followed by X-ray phase analysis 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.

Толық мәтін

Рұқсат жабық

Авторлар туралы

М. Ryumin

Kurnakov Institute of General and Inorganic Chemistry of RAS

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

G. Nikiforova

Kurnakov Institute of General and Inorganic Chemistry of RAS

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

P. Gagarin

Kurnakov Institute of General and Inorganic Chemistry of RAS

Хат алмасуға жауапты Автор.
Email: gagarin@igic.ras.ru
Ресей, Moscow, 119991

O. Kondrat’eva

Kurnakov Institute of General and Inorganic Chemistry of RAS

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

K. Gavrcihev

Kurnakov Institute of General and Inorganic Chemistry of RAS

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

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2. Fig. 1. Temperature dependences of heat flux and mass change of PrMgAl11O19 precursor obtained by the deposition method.

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3. Fig. 2. Diffractograms of PrMgAl11O19 precursor obtained by deposition method and annealed at 600 (1), 1000 (2), 1300 (3), 1400 (4), 1500 (5), 1600 (6) and 1700°C (7). P is PrAlO3 (perovskite), S is MgAl2O4 (spinel), C is a-Al2O3 (corundum), O is Pr6O11, and γ is γ-Al2O3. Unlabeled peaks refer to the PrMgAl11O19 phase with magnetoplumbite structure.

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4. Fig. 3. Results of thermal and thermogravimetric analysis of PrMgAl11O19 precursor obtained by sol-gel method.

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5. Fig. 4. Diffractograms of PrMgAl11O19 precursor prepared by sol-gel method and annealed at 1000 (1), 1500 (2), 1600 (3) and 1700°C (4). P is PrAlO3 (perovskite) and S is MgAl2O4 (spinel). Unlabeled peaks refer to the PrMgAl11O19 phase with magnetoplumbite structure.

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6. Fig. 5. Diffractogram of PrMgAl11O19.

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7. Fig. 6. Microphotograph of magnesium praseodymium hexaaluminate prepared by sol-gel synthesis method and annealed at 1600°C.

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8. Fig. 7. Temperature dependences of the Gibbs energy of the reactions of PrMgAl11O19 formation. 1-4 - numbers of reactions (see in the text).

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