Chromium(II) selenide

Chromium(II) selenide
Names
	IUPAC name Chromium(2+) selenide
Identifiers
CAS Number	12053-13-3;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.031.805
EC Number	234-999-1;
PubChem CID	82886;
CompTox Dashboard (EPA)	DTXSID001014274 ;
	InChI InChI=1S/Cr.Se Key: UVZCKRKEVWSRGT-UHFFFAOYSA-N;
	SMILES [Cr]=[Se];
Properties
Chemical formula	CrSe
Molar mass	130.96 g/mol
Appearance	white to pale yellow crystalline powder
Density	6.74 g/cm3
Melting point	~1500 °C
Solubility in water	insoluble
Structure[1]
Crystal structure	NiAs type (hexagonal)
Space group	P63/mmc, No. 194
Lattice constant	a = 371 pm, c = 603 pm
Hazards
NFPA 704 (fire diamond)	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). Infobox references

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 Cr₇Se₈, Cr₃Se₄, Cr_0.68Se, Cr₂Se₃, 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

Lotgering, F.K.; Gorter, E.W. (1957). "Solid solutions between ferromagnetic and antiferromagnetic compounds with NiAs structure". Journal of Physics and Chemistry of Solids. Elsevier BV. 3 (3–4): 238–249. doi:10.1016/0022-3697(57)90028-8. ISSN 0022-3697.
NIOSH Pocket Guide to Chemical Hazards. "#0141". National Institute for Occupational Safety and Health (NIOSH).
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. American Chemical Society (ACS). 9 (9): 2125–2131. doi:10.1021/ic50091a032. ISSN 0020-1669.
Tsubokawa, Ichiro (1960). "The Magnetic Properties of Single Crystals of Chromium Selenide". Journal of the Physical Society of Japan. Physical Society of Japan. 15 (12): 2243–2247. doi:10.1143/jpsj.15.2243. ISSN 0031-9015.
Zhang, Yu; Chu, Junwei; Yin, Lei; et al. (2019-03-28). "Ultrathin Magnetic 2D Single‐Crystal CrSe". Advanced Materials. Wiley. 31 (19): 1900056. doi:10.1002/adma.201900056. hdl:10278/3742833. ISSN 0935-9648.

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