Valence state mapping and quantitative electron spectroscopic imaging of exsolution in titanohematite by energy-filtered TEM |
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| Authors: | U Golla A Putnis |
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| Institution: | (1) Institut für Mineralogie and the Interdisciplinary Centre for Electron Microscopy and Microanalysis (ICEM), University of Münster, Corrensstrasse 24, 48149 Münster, Germany e-mail: golla@nwz.uni-muenster.de Tel.: +49-251-8333406; Fax: +49-251-8338397, DE |
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| Abstract: | The microstructure of hematite-ilmenite exsolution intergrowth of a natural titanohematite crystal from a granulite has been
investigated in a transmission electron microscope equipped with an energy filter. Special emphasis is on quantitative compositional
mapping at the nanometre scale using electron spectroscopic imaging, as well as mapping the Fe3+ and Fe2+ valence distribution in the intergrowth. Quantitative point analyses by energy-dispersive X-ray analysis have been compared
with results from electron energy-loss spectroscopy and element-distribution mapping. The results indicate that the coexisting
compositions of the two phases (Ilm88Hem12 and Ilm16Hem84) are independent of the size of the exsolution. The application of quantitative mapping to determining diffusion profiles
around precipitates is demonstrated.
Received: 30 March 2000 / Accepted: 7 September 2000 |
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| Keywords: | Analytical TEM Energy-filtering TEM Electron spectroscopic imaging Titanohematites Exsolution |
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