In this review, we describe the many roles chalcogenides play as organocatalysts. Chalcogens, or the oxygen family, * To whom correspondence should be addressed. Phone: +00-44-1179546315. Fax: +00-44-117-9298611. E-mail: [email protected]. † University of Bristol. ‡ Current Address: Department of Biochemistry, University of Wisconsins Madison, 433 Babcock Drive, Madison, Wisconsin 53706-...

Iron chalcogenides, binary FeSe, FeTe and ternary FeTe x Se1-x , FeTe x S1-x and FeTe:O x , are the simplest compounds amongst the recently discovered iron-based superconductors. Thin films of iron chalcogenides present many attractive features that are covered in this review, such as: (i) easy fabrication and epitaxial growth on common single-crystal substrates; (ii) strong enhancement of supe...

We investigated the decomposition mechanism of Mo3S13 (chalcogenides) and Mo2O2Sx(x = 6,8) through Density Functional Theory, in particular Mo2O2Sx. Oxythiomolybdates are more stable than chalcogenides, decompose cathodic reactions, while chalcogenides also anodic reactions. The solvent acts on polymerization Mo2O2S6, blocking or reducing between Mo2O2S6 clusters. electrons’ excess is responsib...

PbSe is a surprisingly good thermoelectric material due, in part, to its low thermal conductivity that had been overestimated in earlier measurements. The thermoelectric figure of merit, zT, can exceed 1 at high temperatures in both p-type and n-type PbSe, similar to that found in PbTe. While the p-type lead chalcogenides (PbSe and PbTe) benefit from the high valley degeneracy (12 or more at hi...