T(x) Diagram of the (MnTe)_1-x–(Ga₂Te₃)_x System

Abstract

The phase diagram of the semimagnetic system (MnTe)1-x -(Ga2Te3) x has been determined from SEM, DTA, X-ray and EDS investigations. It has been found that a miscibility gap exists for x<0.50, while for x≥0.50 compositions the two chalcogenides form, at high temperature, a complete solid solution. A structural characterization of the adamantine phase MnGa2Te4 is also reported.

Phase Equilibria in the MnGa2Tе4-MnIn2Tе4 System, Crystal Structure and Physical Properties of MnGaInTе4

“…According to the DTA data, the MnGa 2 Tе 4 and MnIn 2 Tе 4 compounds melt congruently correspondingly at 1075 ± 3 K and 1021 ± 3 K, which is somewhat different from the literature data. [25][26][27][28] Analysis of the powder X-ray diffraction patterns confirmed the single-phase of both compounds.…”

“…The starting compounds MnGa 2 Tе 4 and MnIn 2 Tе 4 were studied in detail. According to authors, 25 the Mn-Ga 2 Tе 4 compound melts congruently at 1118 K (at 1093±10 K, 26 ) and has a homogeneity region of 49.8-50.2 mol% MnTe over the MnTe-Ga 2 Tе 3 section. The MnIn 2 Tе 4 compound also melts congruently at 1013 K, 27 (at 1040 K according to reference, 28 ).…”

“…The crystal structure of the MnGa 2 Tе 4 was studied in a number papers. 26,29,30 The authors, 29 showed that this compound has a pseudo-tetragonal monoclinic unit cell with parameters: a = b = 0.847 nm; c = 4.83 nm; α = β=γ ~ 90°; Z = 16. Close parameters were obtained: a = b = 0.8486 nm; c = 4.840 nm; α = β = γ ~ 90°; Z = 16.…”

“…Close parameters were obtained: a = b = 0.8486 nm; c = 4.840 nm; α = β = γ ~ 90°; Z = 16. 26 The crystal structure of MnGa 2 Tе 4 was studied by the Laue method. 30 It was shown that this compound crystallizes in the monoclinic structure (Sp.…”