Open AccessA Li K ‐edge XANES study of salts and minerals
Author(s) -
O'Shaughnessy Cedrick,
Henderson Grant S.,
Moulton Benjamin J. A.,
Zuin Lucia,
Neuville Daniel R.
Publication year - 2018
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577518000954
Subject(s) - xanes , electronegativity , aluminosilicate , lithium (medication) , k edge , chemistry , absorption (acoustics) , absorption edge , bond length , analytical chemistry (journal) , absorption spectroscopy , inorganic chemistry , crystallography , materials science , spectral line , band gap , physics , crystal structure , optics , medicine , biochemistry , optoelectronics , organic chemistry , composite material , chromatography , astronomy , catalysis , endocrinology
The first comprehensive Li K ‐edge XANES study of a varied suite of Li‐bearing minerals is presented. Drastic changes in the bonding environment for lithium are demonstrated and this can be monitored using the position and intensity of the main Li K ‐absorption edge. The complex silicates confirm the assignment of the absorption edge to be a convolution of triply degenerate p ‐like states as previously proposed for simple lithium compounds. The Li K ‐edge position depends on the electronegativity of the element to which it is bound. The intensity of the first peak varies depending on the existence of a 2 p electron and can be used to evaluate the degree of ionicity of the bond. The presence of a 2 p electron results in a weak first‐peak intensity. The maximum intensity of the absorption edge shifts to lower energy with increasing SiO 2 content for the lithium aluminosilicate minerals. The bond length distortion of the lithium aluminosilicates decreases with increasing SiO 2 content, thus increased distortion leads to an increase in edge energy which measures lithium's electron affinity.