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 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.
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