12325-81-4Relevant articles and documents
Rare earth metal disulfides - Syntheses and crystal structures of α-CeS2, α-NdS2, β-LaS2, β-CeS2, and β-PrS2
Schleid, Thomas,Lauxmann, Petra,Graf, Christian,Bartsch, Christian,Doert, Thomas
, p. 189 - 196 (2009)
α-CeS2 and α-NdS2 were obtained by a metathesis reaction of the anhydrous trichlorides LfiCI3 (Ln = Ce, Nd) and Na2S2 at 1070 K. The two compounds adopt a monoclinic structure type, the so-called CeSe
Rolland, B. Le,Molinie, P.,Colombet, P.,McMillan, P. F.
, p. 312 - 319 (1994)
The La2S3LaS2 system: Thermodynamic and kinetic study
Vasilyeva,Nikolaev
, p. 1747 - 1751 (2010)
A detailed thermodynamic study of the LaS2La2S 3 system in the temperature range 3501000 °C was performed, starting from high quality crystals LaS2 as the highest polysulfide in the system, and using a sensitive static tensimetric method with a quartz Bourdon gauge and a membrane as a null-point instrument. The pSTx diagram obtained has shown that the phase region covering the composition between LaS2 and La2S3, which was previously described as a single grossly nonstoichiometric phase, consists of three discrete stoichiometric phases, LaS2.00, LaS1.91, and LaS1.76, where compositions could be determined with an accuracy of ±0.01 f.u. The thermodynamic characteristics of evaporation of the polysulfides as well as standard heat of LaS2 formation were calculated. The role of kinetics in the formation of ordered superstructures of sulfur-poorer polysulfides with different formal concentration of vacancies is considered.
