PHASE-DIAGRAM OF THE AG2TE-IN2TE3 SYSTEM

The phase diagram of the Ag2Te-In2Te3 quasibinary system was establish ed by differential thermal analysis and X-ray diffraction, in particul ar by the Guinier-Lenne method. This study confirms the existence of t hree intermediate ternary phases: AgInTe2, which crystallizes in a cha lcopyrite-type structure and possesses a homogeneity range, undergoes a peritectic decomposition at 650 degrees C; AgIn5Te8, which possesses a large homogeneity range, shows a phase transition at 699 degrees C and congruently melts at 725 degrees C; Ag3In97Te147, which crystalliz es in a cubic structure, incongruently melts at 672 degrees C. (C) Aca demie des sciences/Elsevier, Paris.