Chromium(II) selenide

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Chromium(II) selenide
Names
IUPAC name
Chromium(2+) selenide
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.031.805 Edit this at Wikidata
EC Number
  • 234-999-1
  • InChI=1S/Cr.Se
    Key: UVZCKRKEVWSRGT-UHFFFAOYSA-N
  • [Cr]=[Se]
Properties
CrSe
Molar mass 130.96 g/mol
Appearance white to pale yellow crystalline powder
Density 6.74 g/cm3
Melting point ~1500 °C
insoluble
Structure[1]
NiAs type (hexagonal)
P63/mmc, No. 194
a = 371 pm, c = 603 pm
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 1: Must be pre-heated before ignition can occur. Flash point over 93 °C (200 °F). E.g. canola oilInstability 1: Normally stable, but can become unstable at elevated temperatures and pressures. E.g. calciumSpecial hazards (white): no code
1
1
1
NIOSH (US health exposure limits):
PEL (Permissible)
 TWA 1 mg/m3[2]
REL (Recommended)
 TWA 0.5 mg/m3[2]
IDLH (Immediate danger)
 250 mg/m3[2]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Chromium(II) selenide is an inorganic compound with the chemical formula CrSe. It crystalizes in a hexagonal structure with space group P63/mmc.[3] It is one of many related chromium-selenium phases, including Cr2Se3, as well as Cr7Se8, Cr3Se4, Cr0.68Se, and Cr5Se8.[3] The compound has been described as an antiferromagnet, but its inverse magnetic susceptibility does not match the behavior expected for an antiferromagnet according to the Curie–Weiss law.[1] One suggestion was that the Néel temperature is at 320 K, as the temperature where the compound has maximum specific heat.[4] When synthesized as single atomic layer, CrSe is ferromagnetic, with a Curie Temperature of around 280 K.[5]

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