Phase relations between germanium, tin, and lead chalcogenides in pseudobinary systems containing orthorhombic phases

On the Bridgman growth of lead–tin selenide crystals with uniform tin distribution

“…2a). A structural miscibility gap is observed between 58 and 78 mol% SnSe at an eutectic temperature of 1134 K [15,16]. For the b-phase, the liquid-solid equilibrium segregation coefficient (k=x S /x L ) varies between 0.53 and 0.70 (for temperatures 1253-1168 K, respectively).…”

“…The phase diagram of the Pb-Sn-Se system: (a) PbSe-SnSe quasibinary section[15], (b) liquidus surface in the Pb-Sn-Se system[16], and (c) a fragment of the Pb-Sn-Se phase diagram showing tie lines for x s =0.2 at different temperatures.…”

Topological phase diagram and saddle point singularity in a tunable topological crystalline insulator

“…Instead, a fully gapped electronic structure with the chemical potential inside the band gap is found. This is because SnSe is in primitive orthorhmobic structure 45,46 . This crystal structure breaks both inversion and mirror symmetry, removing the fundamental symmetries which support the TCI phase.…”

Fabrication, Characterization, and Modulation of Functional Nanolayers

“…Copyright © 2014 American Chemical Society crystal structure of SnSe is changed from the thermal equilibrium GeS-type one to the RS-type one because the three-dimensional network of high-coordination number polyhedra [sixfold (PbSe 6 ) in the RS-type one] forms larger band dispersions than two-dimensional layered structures [threefold (SnSe 3 ) in the GeS-type one]. As found in the SnSe-PbSe phase diagram, isovalent Pb 2+ ions can substitute for part of the Sn 2+ sites in the orthorhombic GeS-type SnSe at thermal equilibrium [63]. For example, at 400 K, ∼20% Pb 2+ can occupy the Sn 2+ sites in the orthorhombic GeS-type structure, while more than 60% Pb 2+ substitution is necessary to stabilize the RS-type structure in (Sn, Pb)Se.…”