Results 131 to 140 of about 1,843 (177)

Photoactivity of brookite–rutile TiO2 nanocrystalline mixtures obtained by heat treatment of hydrothermally prepared brookite

Materials Chemistry and Physics, 2011
Abstract Pure brookite phase was prepared by hydrothermal synthesis of titanium peroxo-complex in the presence of glycolic acid at 220 °C. The structure of prepared brookite samples was determined by X-ray powder diffraction (XRD) and selected area electron diffraction (SAED).
Václav Štengl, Daniela Králová
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The optical absorption edge of brookite TiO2

Solid State Communications, 2006
Abstract The optical absorption edge of brookite TiO2 was measured at room temperature, using natural crystals. The measurements extend up to 3.54 eV in photon energy and 2000 cm−1 in absorption coefficient. The observed absorption edge is broad and extends throughout the visible, quite different from the steep edges of rutile and anatase.
R. Zallen, M.P. Moret
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Brookite in the Millstone Grit of Yorkshire

Geological Magazine, 1939
The record by Dr. Rastall (1) of new types of brookite from the Dogger of North-East Yorkshire prompts a note on the brookite of the Millstone Grit of West and South-West Yorkshire, since the brookite of this latter formation presents interesting features somewhat different from those presented by the brookite of the Dogger.
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Facile synthesis of brookite TiO₂ nanoparticles

Chemical Communications, 2020
A simple method has been developed for synthesis of phase-pure and highly crystalline brookite TiO2 nanoparticles from a broad range of titanium precursors.
Aref Mamakhel, Jinlong Yu, Frederik Søndergaard-Pedersen, Peter Hald, Bo Brummerstedt Iversen   +4 more
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EPR of substitutional Fe3+ in TiO2 (Brookite)

Journal of Physics and Chemistry of Solids, 1973
Resume The EPR spectrum of substitutional Fe 3+ in natural crystals of brookite (TiO 2 ) has been analyzed. This represents the first EPR centre to be identified in brookite. The Ka-band data are described by the Hamiltonian parameters: g = 2.002 ± 0.005, D = 0.117 ± 0.006 cm −1 and E = 0.033 ± 0.002 cm −1 .
J.A. Rostworowski, M. Horn, C.F. Schwerdtfeger   +2 more
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Brookite Crystals from Franklin, N.J.

Rocks & Minerals, 1951
(1976). Brookite Crystals from Franklin, N.J. Rocks & Minerals: Vol. 51, A Fifty Year Retrospective, pp. 519-520.
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Hydrothermal Preparation of Nanosized Brookite Powders

Journal of the American Ceramic Society, 2000
Titania powders in pure brookite form were synthesized by hydrothermal treatment of titanium(IV) salt solutions. Two kinds of starting materials, titanium sulfate and titanium tetrachloride, were used in the hydrothermal reactions. The effects of preparation conditions on the polymorphous form and morphology of the titanium dioxide powders were studied.
Yanqing Zheng, Erwei Shi, Suxian Cui, Wenjun Li, Xingfang Hu   +4 more
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The occurrence of rutile, brookite, and anatase on Dartmoor

Mineralogical Magazine and Journal of the Mineralogical Society, 1923
The occurrence of brookite aud anatase within the limits of the Dartmoor granite exposure was first indicated by a sample of stream-sand taken two years ago below the bridge at Dartmeet–a locality which is noteworthy for sands rich ill these and other accessory minerals of the Dartmoor granite.Anatase, either alone or associated with brookite in small ...
Alfred Brammall, H. F. Hardwood
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Note on the occurrence of Brookite in the Cleveland ironstone

Mineralogical Magazine and Journal of the Mineralogical Society, 1905
The references to the occurrence of the titanium dioxide minerals as rock constituents have been so recently summarized in the ‘Mineralogical Magazine, that it is unnecessary to repeat them, except to refer again to Mr. J. J. H. Teall's record of anatase in the Cleveland ironstone.Wishing to procure some of these crystals, a pound of ore from the Main ...
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Zur hydrothermalen Synthese von Brookit

Zeitschrift für anorganische und allgemeine Chemie, 1966
AbstractUntersuchungen des Kristallisationsverhaltens von amorphem TiO2 unter hydrothermalen Bedingungen bei Temperaturen bis 600°C und Drucken bis 1000 atm ermöglichten die Darstellung von Brookit in Gegen wart von NaOH als Lösungsgenossen. Die Bildung von Brookit ist abhängig vom NaOH‐Gehalt der wäßrigen Lösung. Während im alkalifreien bzw.
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