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X-ray photoelectron studies of titanium in biotite and phlogopite

Published online by Cambridge University Press:  09 July 2018

S. Evans  and
E. Raftery
S. Evans
Affiliation:
Edward Davies Chemical Laboratories, University College of Wales, Aberystwyth, Dyfed SY23 1NE, U.K.
E. Raftery
Affiliation:
Edward Davies Chemical Laboratories, University College of Wales, Aberystwyth, Dyfed SY23 1NE, U.K.
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Abstract

X-ray photoelectron diffraction data from single crystals of a biotite containing ∼1% Ti show that although this element is located entirely in octahedral sites, the Ti sites are not precisely equivalent to those of Mg and Fe. Comparisons of Ti 2p X-ray photoelectron spectra from two biotites and from two titaniferous phlogopites (∼0·3–·5% Ti) with those from Ti(II), Ti(III) and Ti(IV) oxides indicate that this element is present as Ti(III) rather than Ti(IV) in all four micas.

Résumé

Résumé

Les données obtenues en analysant des photo-électrons émis par des rayons X dans des échantillons monocristallins d'une biotite contenant ∼1% de Ti montrent que, bien que cet élément se situe entièrement dans des sites octaédriques, les sites titanifères ne sont pas exactement équivalents aux sites magnésifères et ferriefères. La comparaison des spectres photoélectroniques aux rayons X du Ti 2p de deux biotites et de deux phlogopites titanifères (∼0·3–0·5% de Ti) avec ceux des oxides de Ti(II), Ti(III) et Ti(IV) indique que cet élément est présent sous forme de Ti(III) plutot que de Ti(IV) dans les quatre micas.

Kurzreferat

Kurzreferat

Mit Hilfe von röntgen-photoelektron Diffraktometrie wurden Biotiteinzelkristalle mit einem Ti-Gehalt von ∼1% untersucht. Die Ergebnisse zeigen, daß obwohl das Titan ausschließlich oktaedrisch koordiniert ist, diese Positionen nicht exakt mit denen von Mg und Fe übereinstimmen. Ein Vergleich der Ti—röntgen-photoelektron Spektren von 2 Biotiten und 2 titanhaltigen Phlogopiten (0·3–0·5% Ti) mit den Spektren von Ti (II)-, Ti(III)- und Ti(IV)-Oxiden zeigt daß dieses Element bevorzugt in der 3-wertigen Stufe gegenüber der 4-wertigen in allen vier Glimmern auftritt.

Resumen

Resumen

Los datos obtenidos de la difracción de fotoelectrones eyectados por rayos X de monocristales de una biotita que contiene ∼1% Ti muestran que aunque est elemento está situado enteramente en sitios octaédricos, los sitios ocupados por Ti no son equivalentes exactamente a los de Mg y Fe. Las comparaciones de los espectros de fotoelectrones de Ti 2p de dos biotitas y de dos flogopitas titaníferas (∼0·3–0·5% Ti) con los de óxidos Ti(II), Ti(III) y Ti(IV) indican que este elemento está, presente como Ti(III) más bien que como Ti(IV) en las cuatro micas.

Type
Research Article
Information
Clay Minerals , Volume 15 , Issue 3 , September 1980 , pp. 209 - 217
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1980

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