Using the results of X-ray phase, structural, and also metallographic analysis, we have constructed the isothermal section of constitution diagram of the Cr–Ga–Si ternary system at 870 K over the entire concentration range. Ternary compounds are not formed at the temperature of investigations. We have established the existence and determined precisely the homogeneity range of Cr3Si1–xGax ( x = 0–0.357) substitution solid solution by the results of refinement of crystallographic parameters according to the Rietveld method [structural type Cr3Si , Pearson symbol cP8 , space group Pm\documentclass[12pt]{minimal}
\usepackage{amsmath}
\usepackage{wasysym}
\usepackage{amsfonts}
\usepackage{amssymb}
\usepackage{amsbsy}
\usepackage{mathrsfs}
\usepackage{upgreek}
\setlength{\oddsidemargin}{-69pt}
\begin{document}$$ \bar{3} $$\end{document}n , a = 4.556–4.5844(7) Å, RB = 0.0353, Rp = 0.009, Rwp = 0.014, χ2 = 3.68] and metallographic analysis.