Quasi-Ternary System Ag2Se-CdSe-Ga2Se3

Abstract

Phase equilibria in the quasi-ternary system Ag2Se-CdSe-Ga2Se3 were investigated by differential thermal and x-ray phase analysis methods. Phase diagrams of nine vertical sections were constructed. The boundaries of seven single-phase fields were determined which are solid solution ranges of system components and intermediate phases. We constructed the isothermal section at 820 K and the liquidus surface projection, and have determined the position in the system of six invariant processes with the participation of liquid: $$ {\text{L}}_{{{\text{U}}_{1} }} + {\upzeta} {\leftrightarrows} {\upbeta} + {\upeta} $$ (1145 K), $$ {\text{L}}_{{{\text{U}}_{ 2} }} + \upzeta \leftrightarrows \upgamma + \upeta $$ (1138 K), $$ \text{L}_{{U_{3} }} + \upeta \leftrightarrows \updelta + \upgamma $$ (1113 K), $$ {\text{L}}_{{{\text{E}}_{ 1} }} \leftrightarrows \upbeta + \updelta + \upeta $$ (1083 K), $$ {\text{L}}_{{{\text{E}}_{ 2} }} \leftrightarrows \upalpha + \upbeta + \upvarepsilon $$ (969 K), $$ {\text{L}}_{{{\text{E}}_{ 3} }} \leftrightarrows \upbeta + {\updelta} + \upvarepsilon $$ (963 K). Two invariant processes in the sub-solidus part, $$ \upbeta + \updelta \leftrightarrows \upeta + \uplambda $$ and $$ \upbeta + \updelta \leftrightarrows \upvarepsilon + \uplambda $$ at 968 and 938 K, respectively, were investigated as well.