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Titolo:
STRUCTURAL CHARACTERIZATION OF SILVER ION-EXCHANGE IN ALUMINOSILICATEGLASSES
Autore:
INMAN JM; HOUDEWALTER SN; GREAVES GN; DENT AJ; DOBSON BR;
Indirizzi:
UNIV ROCHESTER,INST OPT ROCHESTER NY 14627 SERC,DARESBURY LAB,DARESBURY LAB WARRINGTON WA4 4AD CHESHIRE ENGLAND
Titolo Testata:
JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS
, volume: 32, anno: 1993, supplemento:, 32-2
pagine: 667 - 669
SICI:
0021-4922(1993)32:<667:SCOSII>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
EXAFS;
Keywords:
XAFS; ION EXCHANGE; ALUMINOSILICATE; GLASSES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
8
Recensione:
Indirizzi per estratti:
Citazione:
J.M. Inman et al., "STRUCTURAL CHARACTERIZATION OF SILVER ION-EXCHANGE IN ALUMINOSILICATEGLASSES", JPN J A P 1, 32, 1993, pp. 667-669

Abstract

Ion exchange, which is commonly used to alter the optical and mechanical properties of glasses usually involves a one-for-one substitution of an alkali cation (Na+1) from the glass by a monovalent dopant cation (Ag+1). The structural chemistry of this process, however, is far from understood. In this study we have used XAFS spectroscopy to determine the environments of sodium in a tetrasilicate and aluminosilicate glass and also ion exchange the sodium for silver. We find that the coordination number of sodium falls in the presence of aluminium, but that this is also accompanied by an increase in site disorder. By contrast, the environment of ion exchanged silver is less disordered, the nearest neighbour coordination resembling that of Ag2O. The presence of aluminium in the glass is clearly effective in removing some of the steric constraints of mobile cations, defining preferred routes for ion exchange.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 06:32:04