Hydrogen and minor element incorporation in synthetic rutile

Bromiley, G. D. and Hilairet, N. (2005) Hydrogen and minor element incorporation in synthetic rutile. Mineralogical Magazine, 69 (3). pp. 345-358. DOI 10.1180/0026461056930256

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Abstract

The solubility and incorporation mechanisms of H and various trivalent and divalent cations in synthetic rutile have been investigated. Experiments performed using different bulk Fe2O3 contents demonstrate that Fe3+ substitutes onto the main Ti site, charge-balanced by oxygen vacancies. Under more reducing conditions in Fe-poor systems, the concentration of Ti interstitials in rutile is increased,resulting in a decrease in H solubility. Variation in the solubility of different oxides in rutile as a function of ionic radius implies substitution onto the main Ti site, probably charge-balanced by oxygen vacancies. To a lesser degree, substitution of trivalent and divalent cations is locally charge-balanced by H incorporation. Variation in OH-stretching frequencies in infrared spectra as a function of composition implies that octahedral defects and structurally-incorporated H are coupled. However, in all samples, some of the H is also decoupled from substitutional impurities, as is evident from an OH-absorption band at 3279 cmÿ1. This band corresponds to the main OH band seen in spectra of many natural rutiles, implying that in most rutiles, H defects are decoupled from substitutional defects.

Item Type:	Article
Uncontrolled Keywords:	2005 AREP IA49 2005 P
Subjects:	03 - Mineral Sciences
Divisions:	03 - Mineral Sciences
Journal or Publication Title:	Mineralogical Magazine
Volume:	69
Page Range:	pp. 345-358
Identification Number:	10.1180/0026461056930256
Depositing User:	Sarah Humbert
Date Deposited:	02 Sep 2011 14:02
Last Modified:	23 Jul 2013 09:58
URI:	http://eprints.esc.cam.ac.uk/id/eprint/1588

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