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X-ray absorption spectroscopy in mineralogy: Theory and experiment in the XANES region

By
Annibale Mottana
Annibale Mottana
State University Roma Tre, Department of Geological Sciences Largo S. Leonardo Murialdo 1, I-00146 Rome, Italy e-mail: mottana@uniroma3.it
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Published:
January 01, 2004

Abstract

X-ray absorption spectroscopy has become a common technique in mineral studies only in fairly recent times. It is an element-specific method which is suited to extend structure determination down to the local environment of an atom, i.e. a volume some three orders of magnitude less than that inspected by methods based on X-ray diffraction. However, in line with many other modern techniques, X-ray absorption spectroscopy is neither simple as for the practical operations by which one records high-quality experimental results, nor it is straightforward in the interpretation of them, the more so as minerals are far more complex multi-atomic systems than most compounds investigated by other material scientists. Consequently the mineralogical literature related to X-ray absorption spectroscopy is full of misunderstandings, which may even become traps for a new user. A further motive for the poor interpretation of experimental results that are otherwise technically excellent arises from the bare fact that the theoretical framework of X-ray absorption spectroscopy lies well beyond the basic physics normally taught to mineral and material science students. Indeed, this is possibly why quite a few people have used this powerful technique as if it were a black box (e.g. the ominous “fingerprinting” practice!), or they have overextended the interpretation of spectra beyond what is their true potential content (cf. Stern, 2001).

In this chapter, I try to show all what is possible as well as all what is reasonable to obtain by the main absorption spectroscopy methods in use at the present time

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Contents

European Mineralogical Union Notes in Mineralogy

Spectroscopic methods in mineralogy

Anton Beran
Anton Beran
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Eugen Libowitzky
Eugen Libowitzky
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Mineralogical Society of Great Britain and Ireland
Volume
6
ISBN electronic:
9780903056519
Publication date:
January 01, 2004

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