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Isomorphic substitution in vanadinite [Pb 5 (VO 4 ) 3 Cl]—a Raman spectroscopic study
Author(s) -
Frost Ray L.,
Crane Martin,
Williams Peter A.,
Theo Kloprogge J.
Publication year - 2003
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.978
Subject(s) - raman spectroscopy , chemistry , substitution (logic) , vanadate , crystallography , infrared spectroscopy , analytical chemistry (journal) , infrared , crystal (programming language) , inorganic chemistry , optics , organic chemistry , physics , computer science , programming language
The Raman and infrared spectra of vanadinite [Pb 5 (VO 4 ) 3 Cl] specimens from three localities were studied. Raman spectra were found to be both orientation and temperature dependent. Measurement of the Raman spectra at liquid nitrogen temperature allowed better band separation and increased the intensities of weak bands, thus permitting band assignment. Two types of isomorphous substitution were identified: (a) substitution in the bulk of the crystal where electron beam microanalysis identifies the presence of calcium and copper and (b) surface substitution where infrared spectroscopy shows the isomorphous substitution of vanadate by phosphate and of chloride by hydroxyl groups. Copyright © 2003 John Wiley & Sons, Ltd.