Study of the structural characteristics of a group of natural silicates by means of their Kβ emission spectra

In this work, the Si Kβ and Al Kβ emission spectra of a group of natural silicates typical of a region in San Luis (Argentina) are described qualitatively within the frame of the Molecular Orbital (MO) theory. Since these spectra come from electron transitions from valence orbitals, they offer infor...

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Bibliographic Details
Published in:	Chemical physics Vol. 323; no. 2; pp. 173 - 178
Main Authors:	Deluigi, María Torres, Strasser, Edgardo N., Vasconcellos, Marcos A.Z., Riveros, José A.
Format:	Journal Article
Language:	English
Published:	Elsevier B.V 21-04-2006
Subjects:	Chemical bonds Molecular orbitals Satellite lines Silicates X-ray emission spectra Chemical bonds Molecular orbitals X-ray emission spectra Silicates Satellite lines
Online Access:	Get full text
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Summary:	In this work, the Si Kβ and Al Kβ emission spectra of a group of natural silicates typical of a region in San Luis (Argentina) are described qualitatively within the frame of the Molecular Orbital (MO) theory. Since these spectra come from electron transitions from valence orbitals, they offer information on the chemical bonds that are present and on the molecular orbitals involved. The spectra were obtained by means of an electron microprobe. The energies, intensities and full-width at half-maximum (FWHM) of the lines that conform the silicon and aluminium Kβ spectra were quantified. It was observed that an increase in the number of oxygen ions shared by the tetrahedra (SiO 4) 4− caused a lineal increase in the FWHM of the Si Kβ 1,3 and Al Kβ 1,3 lines. This behavior is caused by the increase of the covalent character of the Si–O and Al–O bonds with the quantity of oxygen ions shared by the adjacent tetrahedra.
ISSN:	0301-0104
DOI:	10.1016/j.chemphys.2005.09.020