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RESEARCH PRODUCT
Structural Changes of Titanium Oxide Induced by Chromium Addition as Determined by an X-Ray Diffraction Study
A. M. VeneziaLeonardo PalmisanoMario Schiavellosubject
inorganic chemicalsAnataseMaterials scienceInorganic chemistrytechnology industry and agricultureAnalytical chemistrychemistry.chemical_elementCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsTitanium oxideInorganic ChemistryChromiumchemistryPhase (matter)X-ray crystallographyMaterials ChemistryCeramics and CompositesCrystallitePhysical and Theoretical ChemistrySolubilitySolid solutiondescription
Abstract An X-ray diffraction study has been carried out on a series of polycrystalline TiO 2 (anatase) catalysts containing Cr(III) at different atomic concentrations (0.2-5.0 at. %), prepared by a co-precipitation method. Analysis of the variation of the unit cell parameters of chromium-doped anatase with respect to pure anatase has allowed us to estimate the solubility limit for the system at around 1.4 at. %. There is no evidence for the existence of a separate crystalline chromium oxide phase. Temperature effects on the cell parameter and on the anatase-rutile transformation rate were also analyzed. An increase in temperature produced release of the chromium from the solid solution. At the same time, an acceleration in the rate of the anatase-to-rutile phase transition was observed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1995-02-01 | Journal of Solid State Chemistry |