Phase Relations in the Tl2Te-TlBiTe2-TlGdTe2 Compositions Region of the Tl-Bi-Gd-Te System and Magnetic Properties of the TlBi1−xGdxTe2 Solid Solutions

Heavy p-elements-rare earth element tellurides are important multifunctional materials with thermoelectric, magnetic, optical, topological insulating, and other properties. This paper presents the results of a study of phase equilibria in the Tl2Te-TlBiTe2-TlGdTe2 system and the magnetic properties of the TlBi1−xGdxTe2 solid solutions. A diagram of solid-phase equilibria of the indicated system has been constructed. According to the data obtained, it is characterized by the formation of wide areas of homogeneity based on the initial compounds of the TlBiTe2-TlGdTe2 boundary system and a continuous series of solid solutions along the Tl9BiTe6-Tl9GdTe6 section (δ-phase). It has been shown that the homogeneity regions of the TlBiTe2 (β1) and TlGdTe2 (β2) compounds form a narrow (1-2 mol.