Chemistry:Chromium(II) selenide
From HandWiki
| Names | |
|---|---|
| IUPAC name
Chromium(2+) selenide
| |
| Identifiers | |
3D model (JSmol)
|
|
| EC Number |
|
PubChem CID
|
|
| |
| |
| 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) | |
| 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, Cr0.68Se, 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
- ↑ 1.0 1.1 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.
- ↑ 2.0 2.1 2.2 NIOSH Pocket Guide to Chemical Hazards. "#0141". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0141.html.
- ↑ 3.0 3.1 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. ISSN 0935-9648.
 |  |
