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Size effects in oxide mechanochemistry

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Abstract

A new size effect has been experimentally found: the mechanochemical synthesis of previously mechanically activated powder mixtures of MgO-Al2O3 oxides with a block size of about 80 nm leads to the formation of MgAl2O4 spinel at room temperature. A model is proposed according to which the mechanism of mechanochemical solid-phase synthesis changes from dislocation transgranular embrittlement to grainboundary sliding, which is accompanied by the generation of dynamic vacancies and low-temperature phase formation via the diffusion-induced migration of grain boundaries.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia

    V. M. Kanevskii

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  1. V. M. Kanevskii
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Correspondence to V. M. Kanevskii.

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Dedicated to the memory of B.K. Vainshtein

Original Russian Text © V.M. Kanevskii, 2011, published in Kristallografiya, 2011, Vol. 56, No. 4, pp. 711–718.

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Kanevskii, V.M. Size effects in oxide mechanochemistry. Crystallogr. Rep. 56, 662–669 (2011). https://doi.org/10.1134/S1063774511040080

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