Premium
XAFS Investigation of Platinum Impurities in Phosphate Glasses
Author(s) -
Karabulut Mevlut,
Marasinghe G. Kanishka,
Click Carol A.,
Metwalli EzzEldin,
Brow Richard K.,
Booth Corwin H.,
Bucher J. J.,
Shuh David K.,
Suratwala Tayyab I.,
Campbell John H.
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00228.x
Subject(s) - x ray absorption fine structure , impurity , coordination number , valence (chemistry) , ion , platinum , chlorine , analytical chemistry (journal) , inorganic chemistry , oxygen , boron , absorption spectroscopy , ternary operation , materials science , xanes , chemistry , spectroscopy , metallurgy , catalysis , biochemistry , physics , organic chemistry , chromatography , quantum mechanics , computer science , programming language
The coordination environments of Pt impurities in a ternary K‐aluminophosphate (KAP) glass and commercial K,Mg‐aluminophosphate (KMAP) laser glasses have been investigated by Pt L III ‐edge X‐ray absorption fine structure (XAFS) spectroscopy. Pt valence in the KAP glass depends on the melt preparation atmosphere. Pt 4+ ions form in melts that are bubbled with oxygen, whereas metallic Pt particles form when these same samples are remelted in air. Residual chlorine in KMAP glasses has an effect on Pt bonding. In chlorine‐free samples, Pt 4+ ions are coordinated with ∼5.4 (8) oxygen atoms with an average distance of 2.02 (1) Å. For glasses with low chlorine contents (<200 ppm Cl), the Pt 4+ ions have both O and Cl atoms in the first coordination shell. As the Cl concentration increases, the number of O nearest neighbors decreases and for Cl:Pt > 5, only Cl nearest neighbors are observed. Pt 4+ ions in these latter glasses are coordinated by ∼5.5 (8) Cl atoms at an average distance of 2.27 (2) Å.