Anatase


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anatase

[′an·ə‚tās]
(mineralogy)
The brown, dark-blue, or black tetragonal crystalline form of titanium dioxide, TiO2; used to make a white pigment. Also known as octahedrite.

Anatase

 

a mineral, one of the three natural polymorphous modifications of titanium dioxide. The mineral crystallizes in a tetragonal system. Its hardness on the mineralogical scale is 5.5–6.0; its density is 3,820–3, 950 kg per cu m. Anatase contains impurities of iron, sometimes tin, and niobium (up to 2.16 percent Nb2O5). It forms small (up to 1 cm), sharp dipyramidal crystals, as well as crystals of plate and prismatic form. Its cleavage is good and in several directions. The color of anatase is greenish yellow to brownish (wiserine) or bluish gray to almost black. It has a bright, diamondlike luster. Upon heating to 620–650°C, anatase changes into rutile. Anatase is found in hydrothermal, crystal-bearing veins of a particular “alpine” type, in metamorphic rock, in placers, and as a product of ilmenite breakdown.

titanium dioxide

A white pigment having a very high opacity; used in paints; occurs in two crystalline forms, anatase and rutile, of which the latter has higher opacity.
References in periodicals archive ?
Synthesis of Nanocrystalline Anatase TiO2 by Microwave Hydrothermal Method, Mater Letters, 60: 479-480.
Structural analysis of coatings revealed that the measured XRD profiles are in good agreement with the various reference data and confirmed the calcium deficient multiphasic nature of synthesized coatings primarily comprised of -TCP, HAP, sodium titanate along with anatase and rutile phases of substrate notwithstanding any effect of aging temperatures of sol.
Maghemite, anatase and rutile were present in small amounts in most of the Fe oxide concentrates in the study.
065) Phase and structure XRD 81% anatase and 19% rutile Shape/morphology TEM Spheroid Surface area ([m.
In North America: Prices for all anatase and rutile TiONA([R])products sold in North America will increase by US 10 cents per pound.
1] indicates the characteristic of anatase crystalline peak, whereas another peak appeared around 625 [cm.
Other topics include pattern recognition of carbonate rocks in RS images, the synthesis of nanocrystalline anatase by a microwave hydrothermal method, the optical and thermal properties of Asian dust over the ocean, thordon bearings lubricated with seawater, and QoS evaluation for web services composition.
Anatase is one of just three active mares owned by Coggan, who is based next door to Norman Court Stud (formerly Home Farm) in West Tytherley near Salisbury.
prepared the superhydrophobic coatings by mixing boehmite nanopowder (20 nm) and anatase nanopowder (6 nm) with perfluroalkyl methacrylic copolymer (Dupont Zonyl 8740).
The XRD pattern of TiO2 shows five primary peaks at: 25,4[degrees], 38,14[degrees], 48,14[degrees], 54,7[degrees] and 63,04[degrees], which can be assigned to different diffraction planes of anatase TiO2.
The models used for illite, hematite, quartz and anatase were taken from the Inorganic Database (ICSD, 2007 /I).