12218-77-8

Basic information

• Product Name: Thorium oxide sulfide(ThOS) (7CI,8CI,9CI)
• Synonyms: Thoriumoxysulfide (ThOS) (6CI)
• CAS NO: 12218-77-8
• Molecular Formula: OS Th
• Molecular Weight: 280.10
• Mol File: 12218-77-8.mol
• Article Data: 5

Chemical Properties

• CAS DataBase Reference: Thorium oxide sulfide(ThOS) (7CI,8CI,9CI)(CAS DataBase Reference)
• NIST Chemistry Reference: Thorium oxide sulfide(ThOS) (7CI,8CI,9CI)(12218-77-8)
• EPA Substance Registry System: Thorium oxide sulfide(ThOS) (7CI,8CI,9CI)(12218-77-8)

Safety Data

• Hazard Codes: 3:
• Safety Statements: x. See also THORIUM and SULFIDES." target="_blank">Ignites on contact with air. When heated to decomposition it emits toxic fume
• Hazardous Substances Data: 12218-77-8(Hazardous Substances Data)

Upstream product

• 7783-06-4 hydrogen sulfide 
• 10026-08-1 thorium tetrachloride 
• 7704-34-9 sulfur 
• 7440-39-3 barium 

Relevant articles and documents

Syntheses, crystal structures, transport properties, and theoretical studies of five members of the MAn2Q5 Family: SrU2S5, BaU2Se5, PbU2S5, BaTh2S5, and BaU2Te5

Five compounds of the MAn2Q5 family, namely, SrU2S5, BaU2Se5, PbU2S5, BaTh2S5, and BaU2Te5, have been synthesized by higherature solid-state reactions. The crystal structures of these compounds were determined by single-crystal X-ray diffraction studies. SrU2S5, BaU2Se5, PbU2S5, and BaTh2S5 crystallize in the PbU2Se5 structure type in space group C2h5-P21/c of the monoclinic system, whereas BaU2Te5 adopts the (NH4)Pb2Br5 structure type in space group D4h18-I4/mcm of the tetragonal system. There are no Q-Q bonds in these structures, so the formulas charge balance as M2+(An4+)2(Q2-)5. The An atoms in the monoclinic structure are seven- or eight-coordinated by Q atoms; the U atoms in the tetragonal structure are eight-coordinated. The M atoms in the monoclinic structure are coordinated to either eight or nine Q atoms, depending on the monoclinic angle; the M atoms in the tetragonal structure are 10-coordinated. Resistivity studies on single crystals of SrU2S5, BaU2Se5, and PbU2S5 show metallic behavior with resistivities of 0.24, 10, and 3.3 m·cm, respectively, at 298 K. Spin-polarized density functional theory in the generalized gradient approximation applied to the four U compounds suggests that they are ferromagnetic. In each compound, the density of states of one spin channel is found to be finite at the Fermi level, whereas there is a gap in the density of states of the other spin channel; this is characteristic of a half-metal.

Single-crystal structures, optical absorptions, and electronic distributions of thorium oxychalcogenides ThOQ (Q = S, Se, Te)

The compounds ThOS, ThOSe, and ThOTe have been synthesized, and their structures have been determined by means of single-crystal X-ray diffraction methods. All three compounds adopt the PbFCl structure type in the tetragonal space group D4hsup

High-pressure X-ray diffraction study of ThOS and UOSe by synchrotron radiation

High-pressure X-ray diffraction studies were performed on ThOS up to 43.3 GPa and on UOSe up to 47.5 GPa, at room temperature, using a diamond anvil cell and synchrotron radiation. The tetragonal structure (P4/nmm) of these compounds was retained over the whole pressure range. The bulk modulus B0 and its pressure derivative B′0 were determined for each compound.