Revised Phase Diagram of the MnSe–Ga2Se3 System

Mammadov F., Agayeva R., Amiraslanov I., Babanlı M.

Russian Journal of Inorganic Chemistry, 2024 (SCI-Expanded, Scopus) identifier

  • Nəşrin Növü: Article / Article
  • Nəşr tarixi: 2024
  • Doi nömrəsi: 10.1134/s0036023623602611
  • jurnalın adı: Russian Journal of Inorganic Chemistry
  • Jurnalın baxıldığı indekslər: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Açar sözlər: homogeneity region, magnetic materials, manganese gallium selenides, phase diagram, solid solutions
  • Açıq Arxiv Kolleksiyası: Məqalə
  • Adres: Bəli

Qısa məlumat

Abstract: Phase equilibria in the MnSe–Ga2Se3 system were re-investigated by differential thermal analysis (DTA) and X-ray powder diffraction (XRD), and a phase diagram was constructed, somewhat differing from that presented earlier in the literature. We found that the system featured the formation of an intermediate phase (γ) with a wide (47–61 mol % Ga2Se3) homogeneity extent. Extensive (~30 mol %) Ga2Se3-base solid solutions were also found. The γ phase undergoes γ′ ↔ γ polymorphic transformation at 1183–1193 K, the temperature depending on the composition. The γ′ high-temperature phase has a minimum melting point at 1205 K and 55 mol % Ga2Se3, and it is in peritectic equilibrium with terminal solid solutions. The tetragonal lattice parameters of the γ phase containing 50 and 60 mol % Ga2Se3 were determined based on X-ray powder diffraction data. The previously indicated ternary compound Mn2Ga2Se5 was not confirmed to exist. A comparative analysis of the results against the related literature was carried out.