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Modelling of substitutional defects in the structure of Ti-bearing hibonite

  • Applications of Synchrotron Radiation in Structural Chemistry
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Abstract

A local atomic structure around titanium positions in Ti-bearing hibonite (CaAl12O19) has been studied. The structural models of substitution of different substitution defects Ti–Al in hibonite by titanium atoms have been considered. Optimization of structural models of hibonite has been done by means of density functional theory calculations using pseudopotential approximation as implemented in VASP 5.3 code. Gibbs free energies analysis has shown that models of substitution of M2 and M4 aluminum positions by titanium atoms are the most probable. For the most probable structural models of Ti-bearing hibonite theoretical X-ray absorption near-edge structure (XANES) spectra near the titanium K edge have been calculated. Significant differences in theoretical XANES spectra calculated for different structural models with non-optimized and optimized atomic structure have been demonstrated. Changes in the intensity of pre-edge structure of TiK XANES spectra for different substitution models of aluminum by titanium have been observed which relate to different titanium coordination in structural models. Energy shift of spectral features towards lower energy for optimized models implies increase of interatomic distances in local surroundings of Ti absorbing atoms.

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Authors and Affiliations

  1. International Research Center “Smart Materials”, Southern Federal University, Rostov-on-Don, Russia

    I. A. Pankin, A. N. Kravtsova, O. E. Polozhentsev & A. V. Soldatov

Authors
  1. I. A. Pankin
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  2. A. N. Kravtsova
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  3. O. E. Polozhentsev
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  4. A. V. Soldatov
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Corresponding author

Correspondence to A. N. Kravtsova.

Additional information

Translated from Zhurnal Strukturnoi Khimii, Vol. 57, No. 7, pp. 1445-1452, September-October, 2016.

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Pankin, I.A., Kravtsova, A.N., Polozhentsev, O.E. et al. Modelling of substitutional defects in the structure of Ti-bearing hibonite. J Struct Chem 57, 1369–1376 (2016). https://doi.org/10.1134/S0022476616070106

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  • DOI: https://doi.org/10.1134/S0022476616070106

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