Chromium(IV) oxide

Chromium(IV) oxide^[1]
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.^[3] It once was widely used in magnetic tape emulsion.^[4] With the increase in popularity of CDs and DVDs and more recently digital media, 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.

^ Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, FL: CRC Press. pp. 4–53. ISBN 0-8493-0594-2.
^ ^a ^b ^c NIOSH Pocket Guide to Chemical Hazards. "#0141". National Institute for Occupational Safety and Health (NIOSH).
^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
^ Gerd Anger, Jost Halstenberg, Klaus Hochgeschwender, Christoph Scherhag, Ulrich Korallus, Herbert Knopf, Peter Schmidt, Manfred Ohlinger. "Chromium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a07_067. ISBN 978-3527306732.{{cite encyclopedia}}: CS1 maint: multiple names: authors list (link)

[hand-1] Lide, David R. (1998). Handbook of Chemistry and Physics (87 ed.). Boca Raton, FL: CRC Press. pp. 4–53. ISBN 0-8493-0594-2.

[PGCH-2] NIOSH Pocket Guide to Chemical Hazards. "#0141". National Institute for Occupational Safety and Health (NIOSH).

[G&E-3] Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.

[ullmanns-4] Gerd Anger, Jost Halstenberg, Klaus Hochgeschwender, Christoph Scherhag, Ulrich Korallus, Herbert Knopf, Peter Schmidt, Manfred Ohlinger. "Chromium Compounds". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a07_067. ISBN 978-3527306732.{{cite encyclopedia}}: CS1 maint: multiple names: authors list (link)

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[2]

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Names

IUPAC name Chromium(IV) oxide, Chromium dioxide
Other names Crolyn magtrieve
Identifiers
CAS Number	12018-01-8^Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:48263^Y
ChemSpider	21171202^Y
ECHA InfoCard	100.031.470
PubChem CID	176261494
RTECS number	GB6400000
UNII	7BHJ7466GL^Y
CompTox Dashboard (EPA)	DTXSID7065174
InChI InChI=1S/Cr.2O^Y Key: AYTAKQFHWFYBMA-UHFFFAOYSA-N^Y 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^[2]
REL (Recommended)	TWA 0.5 mg/m³^[2]
IDLH (Immediate danger)	250 mg/m³^[2]
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). N verify (what is ^YN ?) Infobox references

Chromium(IV) oxide

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