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Formation Kinetics and Mechanisms of BaFe9.5Al2.5O19 and SrFe9.5Al2.5O19 Solid Solutions

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Inorganic Materials Aims and scope

Abstract

The kinetics and mechanisms of solid-state reactions in BaCO3 + 4.75Fe2O3 + 1.25Al2O3 and SrCO3 + 4.75Fe2O3 + 1.25Al2O3 powder mixtures, leading to the formation of BaFe9.5Al2.5O19 and SrFe9.5Al2.5O19 magnetoplumbite solid solutions, were studied in the range 1140–1270 K by x-ray diffraction and magnetization measurements. The results demonstrate that the reaction intermediates are BaFe2O4, SrFeO3 – x  , SrAl2O4, BaFe12 – x Al x O19, SrFe12 – x Al x O19 and BaAl12 – x Fe x O19, SrAl12 – x Fe x O19 solid solutions containing less aluminum compared to the final product, and BaAl12O19 and SrAl12O19 solid solutions based on BaFe9.5Al2.5O19 and SrFe9.5Al2.5O19. The constant K Y in the Yander equation (1 – \((1 - \sqrt[3]{{1 - \alpha }})^2 \) = K Yτ is shown to exhibit Arrhenius behavior: K Y = 5.08 × 1014exp (– 390 × 103/RT) for BaFe9.5Al2.5O19 and K Y = 3.22 × 104exp (–155.1 × 103/RT) for SrFe9.5Al2.5O19.

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  1. Belarussian State Technological University, ul. Sverdlova 13a, Minsk, 220050, Belarus

    L. A. Bashkirov & Yu. L. Kostyushko

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  1. L. A. Bashkirov
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  2. Yu. L. Kostyushko
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Bashkirov, L.A., Kostyushko, Y.L. Formation Kinetics and Mechanisms of BaFe9.5Al2.5O19 and SrFe9.5Al2.5O19 Solid Solutions. Inorganic Materials 39, 392–397 (2003). https://doi.org/10.1023/A:1023236017863

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