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Grain structure evolution at sintering of the bulk Bi2Te3 nanomaterial under hot pseudo-isostatic pressure

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Abstract

The bulk nanograined Bi2Te3 material with various mean grain size changing from ~51 to ~97 nm was prepared by microwave-assisted solvothermal method and hot pseudo-isostatic pressure. The mean grain size values obtained for various pressures, P, and temperatures, T, of the sintering process were used to estimate the changes of activation volume, V *, for self-diffusion process responsible for grain growth at sintering of material under study. Analysis of the V *(P) dependences taken at 573 and 673 K allowed us to suggest that one interstitial diffusion mechanism takes place at 573 K, while the diffusion mechanism is assumed to be changed from the vacancy mechanism at low pressures (2 and 4 GPa) to the interstitial mechanism at high pressures (6 and 8 GPa) at 673 K.

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Acknowledgements

All of studies were carried out by the scientific equipment of the joint research center “Diagnostics of structure and properties of nanomaterials” of Belgorod National State University which financially supported with Ministry of Science and Education of RF under project No 14.594.21.0010, unique code RFMEFI59414X0010. This work was also financially supported by the Ministry of Education and Science of the Russian Federation under projects Nos 2014/420-1 and 3.308.2014/K.

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Authors and Affiliations

  1. Joint Research Centre “Diagnostics of Structure and Properties of Nanomaterials”, Belgorod State University, Pobedy St. 85, Belgorod, Russian Federation, 308015

    Oleg Ivanov, Oxana Soklakova & Roman Lyubushkin

  2. National University of Science and Technology «MISIS», Moscow, Russian Federation, 119991

    Andrei Voronin

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  1. Oleg Ivanov
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  2. Oxana Soklakova
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  3. Roman Lyubushkin
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  4. Andrei Voronin
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Correspondence to Oleg Ivanov.

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Ivanov, O., Soklakova, O., Lyubushkin, R. et al. Grain structure evolution at sintering of the bulk Bi2Te3 nanomaterial under hot pseudo-isostatic pressure. J Mater Sci 51, 3415–3421 (2016). https://doi.org/10.1007/s10853-015-9658-9

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  • DOI: https://doi.org/10.1007/s10853-015-9658-9

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