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Thermal relaxation of defects in nanosized mechanically activated МоО3

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Abstract

The regularities of the thermal relaxation of structural defects (paramagnetic centers and microdistortions), as well as the sizes of coherent-scattering regions and the external surface, of mechanically activated МоО3 have been studied with the use of X-ray diffraction, electron paramagnetic resonance, and adsorption/desorption methods. It has been revealed that heating of activated samples at temperatures below 450°C is accompanied by the death of paramagnetic centers, annealing of microdistortions, and liberation of molecular oxygen. It has been assumed that oxygen results from the rupture of deformed Mo–O–Mo bridge bonds formed by its atoms. Above 450°C, recrystallization processes occur, which are accompanied by an increase in the sizes of the coherent-scattering regions and the MoO3 (monoclinic) → MoO3 (orthorhombic) phase transition. The thermal stability of the external particle surface depends on mechanical activation conditions. For samples activated at early stages of activation (fracture regime), the specific surface area decreases by more than an order of magnitude, when a temperature of 450°C is reached. At higher activation doses (friction regime), the sample is not sintered in the same temperature range.

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Authors and Affiliations

  1. Semenov Institute of Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991, Russia

    M. V. Sivak, A. N. Streletskii, I. V. Kolbanev & E. N. Degtyarev

  2. Department of Chemistry, Moscow State University, Moscow, 119992, Russia

    A. V. Leonov

Authors
  1. M. V. Sivak
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  2. A. N. Streletskii
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  3. I. V. Kolbanev
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  4. A. V. Leonov
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  5. E. N. Degtyarev
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Correspondence to A. N. Streletskii.

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Original Russian Text © M.V. Sivak, A.N. Streletskii, I.V. Kolbanev, A.V. Leonov, E.N. Degtyarev, 2016, published in Kolloidnyi Zhurnal, 2016, Vol. 78, No. 5, pp. 618–628.

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Sivak, M.V., Streletskii, A.N., Kolbanev, I.V. et al. Thermal relaxation of defects in nanosized mechanically activated МоО3 . Colloid J 78, 674–684 (2016). https://doi.org/10.1134/S1061933X16050185

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  • DOI: https://doi.org/10.1134/S1061933X16050185

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