Abstract
The phase diagram of the Ge-Tl-Te ternary system was established by differential thermal analysis, X-ray diffraction, and metallographic analysis. Four ternary incongruent compounds were confirmed: Tl 2GeTe 3, Tl 8GeTe 5, Tl 2GeTe 2 and Tl 6Ge 2Te 6, which are formed by peritectic p-type reactions at 378 °C, 470 °C, 422 °C and 416 °C respectively. Two new ternary compounds were identified: Tl 2GeTe 5 which has a congruent melting point at 322 °C and TlGeTe 3 which is formed by a peritectic P-type reaction at 330 °C. One binary section and five two-phase sections are described. Seventeen invariant points are characterized. One liquid-liquid miscibility ternary gap exists. A phase diagram is proposed.
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