Ultralow Thermal Conductivity in Halogen-Doped PbSnS with Optimized Thermoelectric Properties.

Here, we investigate PbSnS, a wide band gap (1.13 eV) compound, as a promising thermoelectric material for power generation. Single crystal X-ray diffraction analysis reveals its 2D-layered structure, akin to the GeSe structure type, with Pb and Sn atoms sharing the same crystallographic site.

Nanotube Structure of AsPSSe ( = 0, 1).

Single-wall nanotubes of isostructural AsPSSe ( = 0, 1) are grown from solid-state reaction of stoichiometric amounts of the elements. The structure of AsPS was determined using single-crystal X-ray diffraction and refined in space group . The infinite, single-walled AsPS nanotubes have an outer diameter of ≈1.

Molecular germanium selenophosphate salts: phase-change properties and strong second harmonic generation.

A new series of germanium chalcophosphates with the formula A(4)GeP(4)Q(12) (A = K, Rb, Cs; Q = S, Se) have been synthesized. The selenium compounds are isostructural and crystallize in the polar orthorhombic space group Pca2(1). The sulfur analogues are isostructural to one another but crystallize in the centrosymmetric monoclinic space group C2/c.

Polysulfide chalcogels with ion-exchange properties and highly efficient mercury vapor sorption.

We report the synthesis of metal-chalcogenide aerogels from Pt(2+) and polysulfide clusters ([S(x)](2-), x = 3-6). The cross-linking reaction of these ionic building blocks in formamide solution results in spontaneous gelation and eventually forms a monolithic dark brown gel. The wet gel is transformed into a highly porous aerogel by solvent exchanging and subsequent supercritical drying with CO(2).

Germanium selenophosphates: the incommensurately modulated 1/∞[Ge(4-x)P(x)Se12(4-)] and the molecular [Ge2P2Se14]6-.

The new germanium selenophosphates K(4)Ge(4-x)P(x)Se(12) (1) and Rb(6)Ge(2)P(2)Se(14) (2) are reported. The former is a one-dimensional metastable compound synthesized using the polychalcogenide flux method that crystallizes in the monoclinic space group P2(1)/c with lattice parameters a = 6.7388(7) Å, b = 13.

Arsenic-containing chalcophosphate molecular anions.

We report five new discrete molecular arsenic-based chalcophosphates, K(7)As(3)(P(2)Se(6))(4) (1), K(6)As(2)(P(2)Se(6))(3) (2), Cs(6)As(2)(P(2)Se(6))(3) (3), and Cs(5)As(P(2)Q(6))(2) [Q = Se (4a) and S (4b)]. Each of the compounds contains unique complex anions comprised of common building blocks that have condensed to produce these anions. Phosphorus forms well-known [P(2)Q(6)](4-) moieties in all of the compounds that are bridged by arsenic trigonal pyramids in 1 and 2 and distorted octahedra in 3, 4a, and 4b.