Features of the structural-phase state of natural magnesite МgCO₃ in the temperature range 1173-6500 K | Izvestiya vuzov. Fizika. 2022. № 7. DOI: 10.17223/00213411/65/7/73

Features of the structural-phase state of natural magnesite МgCO₃ in the temperature range 1173-6500 K

The results of studies influence temperature factor on the phase-structural and morphological changes occurring in natural magnesite (MgCO₃) are presented. The natural magnesite of the Savinsky deposit, Irkutsk region, was used as a raw material. The prepared model samples were subjected to two types of thermal action: the first is isothermal exposure at a temperature of 1173 K; the second is heating and melting in a thermal plasma medium at a mass-average temperature of the plasma jet of 6500 K. Qualitative phase analysis has shown that the main phases of the studied states include the standards MgCO₃, MgO in hexagonal and cubic forms. The complete structural information of the lattices was established both in the initial state and after refinement of the structural parameters by the Rietveld method. The stability of the installed phase lattices was assessed by the method of convex hulls using the electronic resource AFLOW. The stability diagram of MgCO₃ is shown together with the energy color gradation taking into account spin polarization.

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Keywords

magnesite, periclase, plasma, heating, melting, phase changes, microstructure

Authors

Name	Organization	E-mail
Shekhovtsov V.V.	Tomsk State University of Architecture and Building	shehovcov2010@yandex.ru
Abzaev Yu.A.	Tomsk State University of Architecture and Building	abzaev@tsuab.ru
Volokitin O.G.	Tomsk State University of Architecture and Building	volokitin_oleg@mail.ru
Skripnikova N.K.	Tomsk State University of Architecture and Building	nks2003@mail.ru
Klopotov A.A.	Tomsk State University of Architecture and Building	klopotovaa@tsuab.ru

Всего: 5

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