Sulfur Nonstoichiometry of PrS2: A Series of New Sulfur-Deficient Phases

Structural, optical and transport properties of layered europium disulfide synthesized under high pressure

“…Progressive deviation from stoichiometry (RES 2± δ ) first decreases the splitting which is ascribed to transition from monoclinic to tetragonal symmetry. 31 This is followed by a significant increase of splitting values (up to 40 cm −1 ) accompanied by the line broadening of the highest-energy A g mode. Because all these features are not observed in EuS 2 samples synthesized by us we can conclude that their composition is very close to 1 : 2 stoichiometry.…”

“…For many light RE disulfides this separation is well established 23 as well as its behavior with variation of compositional stoichiometry of the same compound (PrS 2−δ (ref. 31)). For all studied light stoichiometric RE disulfides with the only exception of Sm, the Davydov splitting is remarkably close to the constant, ≈10 cm −1 .…”

“…There were many studies of optical, 23,25,[29][30][31][32] magnetic (LnS 2 and CeS 2 ) 33,34 and thermodynamic (Pr/GdSe 2 and PrS 2−δ ) 31,35 properties of either heavy or light RE dichalcogenides with notable omission of EuS 2 which separates the light and heavy lanthanides. In this work we report the study of europium(III) disulfide EuS 2 with nearly perfect compositional stoichiometry.…”

“Soft” Alkali Bromide and Iodide Fluxes for Crystal Growth

“…A powder sample of PdS was initially obtained by reacting stoichiometric quantities of the elements at 900°C and then recrystallized from a 20-fold excess of KI at the same temperature, demonstrating the ability of the KI flux to dissolve sulfide materials. The same flux has been used to obtain single crystals of PrS 2 at a temperature of 700°C, slightly above the flux melting point of 681°C (Vasilyeva and Belaya, 1999 ). A KBr flux allowed for the crystallization of SmTe 1.80 single crystals from a mixture of the elements; however, no efforts were made to improve upon the relatively low 5% yield of the phase (Ijjaali and Ibers, 2006 ).…”

Assessing the Electronic and Optical Properties of Lanathanum Diselenide: a computational study

“…The rare earth polychalcogenides demonstrate a number of interesting electronic and structural properties related to their compositional flexibility and layered structure: multiple non-stoichiometric LnCh 2−x phases have been synthesised in the past several decades [1][2][3][4] and the compound family draws comparisons with the transition metal dichalcogenides with their tunability. While the lanthanum polychalcogenides do not exhibit the magnetic behaviour associated with the valence 4f states later in the rare earth series, since superconductivity was found in the intermediate phases between La 2 Se 3 and La 3 Se 4 , 5 the lanthanum selenides have been no less popular, and represent a fertile ground for solid-state materials research.…”