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Chromium(II) selenide

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]

References

[edit]
  1. ^ a b Lotgering, F.K.; Gorter, E.W. (1957). "Solid solutions between ferromagnetic and antiferromagnetic compounds with NiAs structure". Journal of Physics and Chemistry of Solids. 3 (3–4). Elsevier BV: 238–249. Bibcode:1957JPCS....3..238L. doi:10.1016/0022-3697(57)90028-8. ISSN 0022-3697.
  2. ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0141". National Institute for Occupational Safety and Health (NIOSH).
  3. ^ a b Wehmeier, F. H.; Keve, E. T.; Abrahams, S. C. (1970). "Preparation, structure, and properties of some chromium selenides. Crystal growth with selenium vapor as a novel transport agent". Inorganic Chemistry. 9 (9). American Chemical Society (ACS): 2125–2131. doi:10.1021/ic50091a032. ISSN 0020-1669.
  4. ^ Tsubokawa, Ichiro (1960). "The Magnetic Properties of Single Crystals of Chromium Selenide". Journal of the Physical Society of Japan. 15 (12). Physical Society of Japan: 2243–2247. Bibcode:1960JPSJ...15.2243T. doi:10.1143/jpsj.15.2243. ISSN 0031-9015.
  5. ^ Zhang, Yu; Chu, Junwei; Yin, Lei; et al. (2019-03-28). "Ultrathin Magnetic 2D Single-Crystal CrSe". Advanced Materials. 31 (19). Wiley: 1900056. Bibcode:2019AdM....3100056Z. doi:10.1002/adma.201900056. hdl:10278/3742833. ISSN 0935-9648. PMID 30920696.


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