Open AccessИзменение термодинамических свойств твердого раствора Si-Ge при уменьшении размера нанокристалла
Author(s) -
М.Н. Магомедов
Publication year - 2019
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2019.11.48424.484
Subject(s) - nanocrystal , isochoric process , isobaric process , thermodynamics , equation of state , isobar , materials science , physics , nanotechnology , atomic physics , nucleon
In the framework of the “medium atom” model for a binary alloy, the state equation and the thermodynamic properties of the Si0.5-Ge0.5 solid solution are calculated. Using the RP model of the nanocrystal, the changes of both the state equation and thermodynamic properties are calculated during the transition from a macrocrystal to a nanocrystal of 222 atoms with a geometric Gibbs surface. The calculations were carried out along the isotherms T = 100, 300 and 1000 K, in the pressure range: – 1 < P < 7 GPa. The change in the properties of both at the isochoric and at isobaric (P = 0) decrease in the number of atoms in a nanocrystal were studied. It is shown that at an isobaric (P = 0) decrease of size, the specific volume of the Si0.5-Ge0.5 nanocrystal increases the more, the higher the nanocrystal temperature.This work was supported by the Russian Foundation for Basic Research (project no. 18-29-11013_mk) and the program no. 6 of the Presidium of the Russian Academy of Sciences (grant no. 2-13)