Open AccessPhosphorus K ‐edge XANES spectroscopy of mineral standards
Author(s) -
Ingall Ellery D.,
Brandes Jay A.,
Diaz Julia M.,
de Jonge Martin D.,
Paterson David,
McNulty Ian,
Elliott W. Crawford,
Northrup Paul
Publication year - 2011
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/s0909049510045322
Subject(s) - phosphate minerals , xanes , apatite , mineral , phosphate , manganese , chemistry , mineralogy , crystallinity , phosphorus , silicate minerals , clay minerals , silicate , spectroscopy , crystallography , physics , organic chemistry , quantum mechanics
Phosphorus K ‐edge X‐ray absorption near‐edge structure (XANES) spectroscopy was performed on phosphate mineral specimens including ( a ) twelve specimens from the apatite group covering a range of compositional variation and crystallinity; ( b ) six non‐apatite calcium‐rich phosphate minerals; ( c ) 15 aluminium‐rich phosphate minerals; ( d ) ten phosphate minerals rich in either reduced iron or manganese; ( e ) four phosphate minerals rich in either oxidized iron or manganese; ( f ) eight phosphate minerals rich in either magnesium, copper, lead, zinc or rare‐earth elements; and ( g ) four uranium phosphate minerals. The identity of all minerals examined in this study was independently confirmed using X‐ray powder diffraction. Minerals were distinguished using XANES spectra with a combination of pre‐edge features, edge position, peak shapes and post‐edge features. Shared spectral features were observed in minerals with compositions dominated by the same specific cation. Analyses of apatite‐group minerals indicate that XANES spectral patterns are not strongly affected by variations in composition and crystallinity typical of natural mineral specimens.