Akademik Məlumat İdarəetmə Sistemi
Journal of Chemical and Engineering Data, vol.70, no.4, pp.1759-1768, 2025 (SCI-Expanded, Scopus)
The phase equilibria in the Mn-Sb-Bi-Te system play an important role in designing layered magnetic topological insulator (MTI) phases. This study reports, for the first time, the phase equilibria of the MnTe-Sb2Te3-Bi2Te3 system to aid in designing MTI phases. The solid-phase equilibrium diagram at 500 °C, the liquidus surface projection, and the phase diagrams of the five isopleth sections have been constructed using experimental data of differential thermal analysis, X-ray diffraction analysis, and scanning electron microscopy techniques. The primary crystallization fields of phases, types, and coordinates of invariant and monovariant equilibria were determined. Complete solid solutions were detected in the MnSb2Te4-MnBi2Te4 and MnSb2Te4-MnBi2Te4 vertical sections, with no miscibility gap. The lattice parameters of a continuous series of solid solutions were refined via Le Bail methods and compared with values predicted by Vegard’s law, confirming the compositional dependence of the lattice constants. There are also noticeable homogeneity regions based on the other homologous members of the (MnBi2Te4)(Bi2Te3)m family, with m = 2,···,6. Besides, aliovalent cation-substituted solid solubility dominates the Sb2Te3-Bi2Te3 side of the diagram. The obtained tetradymite-type layered solid solutions in this study demonstrate tunable magnetic properties compared to the parent compounds, providing a pathway for optimizing their functional characteristics in MTIs.