Names | |
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IUPAC name
Chromium(IV) oxide, Chromium dioxide
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Other names
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Identifiers | |
3D model (JSmol)
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ChEBI | |
ChemSpider | |
ECHA InfoCard | 100.031.470 |
PubChem CID
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RTECS number |
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UNII | |
CompTox Dashboard (EPA)
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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)
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TWA 1 mg/m3[2] |
REL (Recommended)
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TWA 0.5 mg/m3[2] |
IDLH (Immediate danger)
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250 mg/m3[2] |
Safety data sheet (SDS) | ICSC 1310 |
Related compounds | |
Other cations
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Related
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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 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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