Antimony triselenide

Antimony triselenide is the chemical compound with the formula Sb2Se3. The material exists as the sulfosalt mineral antimonselite (IMA symbol: Atm), which crystallizes in an orthorhombic space group. In this compound, antimony has a formal oxidation state +3 and selenium −2. The bonding in this compound has covalent character as evidenced by the black color and semiconducting properties of this and related materials. The low-frequency dielectric constant (ε0) has been measured to be 133 along the c axis of the crystal at room temperature, which is unusually large. Its band gap is 1.18 eV at room temperature.

Antimony triselenide
Names
Other names
  • Antimonselite
  • Antimony(III) selenide
  • Selenoxyantimony
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.870
  • InChI=1S/2Sb.3Se/q2*+3;3*-2 Y
    Key: WWUNXXBCFXOXHC-UHFFFAOYSA-N Y
  • InChI=1S/2Sb.3Se/q2*+3;3*-2
  • Key: WWUNXXBCFXOXHC-UHFFFAOYSA-N
  • [SbH3+3].[SbH3+3].[Se-2].[Se-2].[Se-2]
Properties
Sb2Se3
Molar mass 480.433 g·mol−1
Appearance black crystals
Density 5.81 g/cm3, solid
Melting point 611 °C (1,132 °F; 884 K)
Structure
Orthorhombic, oP20, SpaceGroup = Pnma, No. 62
Hazards
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 0.5 mg/m3 (as Sb)
REL (Recommended)
 TWA 0.5 mg/m3 (as Sb)
Related compounds
Other anions
 antimony(III) oxide, antimony(III) sulfide, antimony(III) telluride
Other cations
 arsenic(III) selenide, bismuth(III) selenide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references

The compound may be formed by the reaction of antimony with selenium and has a melting point of 885 K.

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