Titanium dioxide

Names
IUPAC names Titanium dioxide Titanium(IV) oxide
Other names Titania Rutile Anatase Brookite
Identifiers
CAS Number	13463-67-7 Y
3D model (JSmol)	Interactive image
ChEBI	CHEBI:32234 Y
ChEMBL	ChEMBL1201136 N
ChemSpider	24256 Y
ECHA InfoCard	100.033.327
E number	E171 (colours)
KEGG	C13409 N
PubChem CID	26042
RTECS number	XR2775000
UNII	15FIX9V2JP Y
CompTox Dashboard (EPA)	DTXSID3021352
SMILES O=[Ti]=O
Properties
Chemical formula	TiO 2
Molar mass	79.866 g/mol
Appearance	White solid
Odor	Odorless
Density	4.23 g/cm3 (rutile) 3.78 g/cm3 (anatase)
Melting point	1,843 °C (3,349 °F; 2,116 K)
Boiling point	2,972 °C (5,382 °F; 3,245 K)
Solubility in water	Insoluble
Band gap	3.05 eV (rutile)[1]
Magnetic susceptibility (χ)	+5.9·10−6 cm3/mol
Refractive index (nD)	2.488 (anatase) 2.583 (brookite) 2.609 (rutile)
Thermochemistry
Std enthalpy of formation ΔfHo298	−945 kJ·mol−1[2]
Standard molar entropy So298	50 J·mol−1·K−1[2]
Hazards
EU classification	Not listed
NFPA 704	0 1 0
Flash point	not flammable
U.S. Permissible exposure limit (PEL)	TWA 15 mg/m3
Related compounds
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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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Infobox references

Titanium dioxide, also known as titanium(IV) oxide or titania /taɪˈteɪniə/, is the naturally occurring oxide of titanium, chemical formula TiO
₂. When used as a pigment, it is called titanium white, Pigment White 6 (PW6), or CI 77891. Generally, it is made from ilmenite, rutile, and anatase. It has a lot of uses, including paint, sunscreen, and food coloring. When used as a food coloring, it has E number E171. 9 million tonnes of it were made in the world in 2014.^[3][4] It is used in around two-thirds of all pigments, and pigments based on the oxide have a total value of around $13.2 billion.^[5]