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Сибирский государственный университет
науки и технологий имени академика М.Ф. Решетнева

Сибирский аэрокосмический журнал
ISSN 2712-8970 (Print) ISSN 2782-5760 (on-line)

Сведения об образовательной организации

UDK 538.9 Doi: 10.31772/2712-8970-2021-22-2-383-390
Prediction of formation of competing phases during the growth of Cr2GaC THIN FILMS ON MgO(111)
Nazarova Z. I., Nazarov A. N.
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 50/38, Akademgorodok, Krasnoyarsk, 660036, Russian Federation; Siberian Federal University, 79, Svobodny Av., Krasnoyarsk, 660041, Russian Federation
MAX-phases are a family of ternary layered compounds with the formal stoichiometry Mn+1AXn (n = 1, 2, 3...), where M is a transition d-metal; A is a p-element (for example, Si, Ge, Al, S, Sn, etc.); X is carbon or nitrogen [1]. Layered triple carbides and nitrides of d-and p-elements (MAX-phases) exhibit a unique combination of properties characteristic of both metals and ceramics, which makes their application as various coatings in space industry very promising. Obtaining the desired properties of the MAX-phases depends on the technological conditions of material synthesis. This requires thorough theoretical modelling of the elements’ interaction at the interface. Concurrent growth of competing phases along with the MAX-phase may occur due to the favorability of competing phases’ formation and may also be promoted by lower energy interfaces with the substrate in comparison with a MAX-phase. In this work, we study thermodynamic favorability of competing phases and Cr2GaC MAX-phase depending on the chemical composition of the atomic flow. To study these compounds, it was necessary to consider the Cr-Ga-C system. According to the effective heat of formation model, each reaction of a certain phase formation can be characterized by enthalpy [2]. To find out the most favorable phases, it was necessary to calculate the enthalpy of all possible reactions. Thus, the task was to sort through all possible reactions between pure elements available in various ratios, in particular, in the ratio corresponding to the given MAX-phase stoichiometry, i.e. Cr:Ga:C=2:1: 1. Moreover, it is considered that the density of near-coincidence sites [3,4] for interfaces between MAX-phase, thermodynamically favourable competing phases and MgO(111) surface shows a role of the interface in the determination of the structural quality of the MAX-phase thin film grown on MgO(111).
Keyword: MAX materials, thin films, competing phases, enthalpy of formation, chromium, galium, carbon.
References

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Nazarov Alexandr Nikolaevich – student, Siberian Federal University; Laboratory assistant, Kirensky Institute of Physics, Federal Research Center KSC SB RAS. E-mail: jercompany@gmail.com.

Nazarova Zoya Igorevna – student, Siberian Federal University; Laboratory assistant, Kirensky Institute of Physics, Federal Research Center KSC SB RAS. E-mail: jercompany@gmail.com. E-mail: zoyavishni@gmail.com.  


  Prediction of formation of competing phases during the growth of Cr2GaC THIN FILMS ON MgO(111)