Oxidation state and local coordination of chromium dopant in soda-lime-silicate and calcium-aluminate glasses
SCIE
SCOPUS
- Title
- Oxidation state and local coordination of chromium dopant in soda-lime-silicate and calcium-aluminate glasses
- Authors
- Choi, YG; Kim, KH; Han, YS; Heo, J
- Date Issued
- 2000-10-27
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- We have analyzed Cr K-edge X-ray absorption sprctra of Cr-doped soda-lime-silicate and calcium-aluminate glasses of which the compositions were 15Na(2)O-15CaO-70SiO(2) and 10MgO-55CaO-35AL(2)O(3) in mole%, respectively. It was estimated that the amount of Cr4+ formed in the aluminate glass was similar to 85 +/- 10% out of the total nominal chromium content. i.e., 0.06 mole%, and the remaining chromium ions were in 6+ oxidation state. In the silicate glass, Cr3+ was accompanied by Cr6+ the portion of which was relatively small compared to that in aluminate glass. Short-range structural units of chromium in the aluminate glass were [CrO4] and severely distorted [CrO6] with a Cr-O bond distance of similar to1.72 A, while [CrO6] polyhedra prevailed in the silicate glass with an average Cr-O length of similar to1.96 A. (C) 2000 Elsevier Science B.V. All rights reserved.
- Keywords
- X-RAY-ABSORPTION; NEAR-EDGE STRUCTURE; CR K-EDGE; TETRAHEDRAL COORDINATION; EXAFS ANALYSIS; FINE-STRUCTURE; SPECTROSCOPY; XANES; COMPLEXES; MINERALS
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/19814
- DOI
- 10.1016/S0009-2614(00)01054-X
- ISSN
- 0009-2614
- Article Type
- Article
- Citation
- CHEMICAL PHYSICS LETTERS, vol. 329, no. 5-6, page. 370 - 376, 2000-10-27
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