Chromium(IV) oxide

Chromium(IV) oxide
Names
	IUPAC name Chromium(IV) oxide, Chromium dioxide
	Other names Crolyn ; magtrieve
Identifiers
CAS Number	12018-01-8 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:48263 ;
ChemSpider	21171202 ;
ECHA InfoCard	100.031.470
PubChem CID	176261494;
RTECS number	GB6400000;
UNII	7BHJ7466GL ;
CompTox Dashboard (EPA)	DTXSID7065174 ;
	InChI InChI=1S/Cr.2O Key: AYTAKQFHWFYBMA-UHFFFAOYSA-N ; InChI=1/Cr.2O/rCrO2/c2-1-3 Key: AYTAKQFHWFYBMA-QAVXBIOBAI;
	SMILES O=[Cr]=O;
Properties
Chemical formula	CrO2
Molar mass	83.9949 g/mol
Appearance	black tetrahedral ferromagnetic crystals
Density	4.89 g/cm3
Melting point	375 °C (707 °F; 648 K) (decomposes)
Solubility in water	Insoluble
Structure
Crystal structure	Rutile (tetragonal), tP6
Space group	P42/mnm, No. 136
Hazards
Flash point	Non-flammable
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3
REL (Recommended)	TWA 0.5 mg/m3
IDLH (Immediate danger)	250 mg/m3
Safety data sheet (SDS)	ICSC 1310
Related compounds
Other cations	Vanadium(IV) oxide; Manganese(IV) oxide
Related	Chromium(II) oxide; Chromium(II,III) oxide; Chromium(III) oxide; Chromium trioxide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Chromium dioxide or chromium(IV) oxide is an inorganic compound with the formula CrO₂. It is a black synthetic magnetic solid. It once was widely used in magnetic tape emulsion. With the increasing popularity of CDs and DVDs, the use of chromium(IV) oxide has declined. However, it is still used in data tape applications for enterprise-class storage systems. It is still considered by many oxide and tape manufacturers to have been one of the best magnetic recording particulates ever invented.

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