Chromium(IV) oxide

Chromium(IV) oxide[1]
Chromium(IV) oxide
Names
IUPAC name
Chromium(IV) oxide, Chromium dioxide
Other names
  • Crolyn
  • magtrieve
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.031.470 Edit this at Wikidata
RTECS number
  • GB6400000
UNII
  • InChI=1S/Cr.2O checkY
    Key: AYTAKQFHWFYBMA-UHFFFAOYSA-N checkY
  • InChI=1/Cr.2O/rCrO2/c2-1-3
    Key: AYTAKQFHWFYBMA-QAVXBIOBAI
  • O=[Cr]=O
Properties
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)
Insoluble
Structure
Rutile (tetragonal), tP6
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
Related
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.

  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.
  2. ^ a b c NIOSH Pocket Guide to Chemical Hazards. "#0141". National Institute for Occupational Safety and Health (NIOSH).
  3. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  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)