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Computer modeling of the local structure, mixing properties, and stability of binary oxide solid solutions with corundum structure

  • Crystal Chemistry
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Abstract

An original technique of computer modeling of substitutional solid solutions has been applied to Al2O3-Cr2O3, Al2O3-Fe2O3, and Fe2O3-Cr2O3 binary systems. The parameters of semiempirical interatomic potentials were optimized using the experimentally studied structural, elastic, and thermodynamic properties of pure components. Among point defects, the most energetically favorable ones for all three oxides are Schottky vacancy quintets. To model (M 1x M 21 − x )2O3 solid solutions, 4 × 4 × 1 disordered supercells with M 1: M 2 cation ratios of 1: 5, 1: 2, 1: 1, 2: 1, and 5: 1 have been constructed in the cation sublattice containing 192 atoms. The mixing enthalpy and volume, interaction parameters, bulk moduli, and vibrational entropy were found by minimizing the interatomic interaction energy in supercells with the symmetry P1. Calculations of the Gibbs energy made it possible to estimate the fields of stability of the Al2O3-Cr2O3 and Al2O3-Fe2O3 solid solutions; these estimates were compared with the experimental data. Histograms of M-M, M-O, and O-O interatomic distances were constructed and the local structure was analyzed for the Al1.0Cr1.0O3, Al1.0Fe1.0O3, and Fe1.0Cr1.0O3 compositions.

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Authors and Affiliations

  1. Moscow State University, Moscow, Russia

    N. N. Eremin, R. A. Talis & V. S. Urusov

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  1. N. N. Eremin
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  2. R. A. Talis
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  3. V. S. Urusov
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Correspondence to N. N. Eremin.

Additional information

Original Russian Text © N.N. Eremin, R.A. Talis, V.S. Urusov, 2008, published in Kristallografiya, 2008, Vol. 53, No. 5, pp. 802–810.

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Eremin, N.N., Talis, R.A. & Urusov, V.S. Computer modeling of the local structure, mixing properties, and stability of binary oxide solid solutions with corundum structure. Crystallogr. Rep. 53, 755–763 (2008). https://doi.org/10.1134/S1063774508050052

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  • DOI: https://doi.org/10.1134/S1063774508050052

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