Cation Effects on Anion Distributions in Aluminophosphate Glasses

Autor:	Richard K. Brow, Frederick S. Stover, EzzEldin Metwalli
Rok vydání:	2001
Předmět:	Metaphosphate Coordination number Inorganic chemistry Disproportionation Alkali metal Pyrophosphate Crystallography chemistry.chemical_compound Octahedron chemistry Materials Chemistry Ceramics and Composites Magic angle spinning Moiety
Zdroj:	Journal of the American Ceramic Society. 84:1025-1032
ISSN:	1551-2916 0002-7820
DOI:	10.1111/j.1151-2916.2001.tb00785.x
Popis:	Alkali aluminophosphate glasses, including those in the system xAl2O3·(1−x)CsPO3 (0 ≤x≤ 0.25), were examined by high-performance liquid chromatography (HPLC), infrared (IR), and 27Al magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopies. Phosphate anions become progressively shorter with the addition of alumina to a metaphosphate glass. Al3+ ions are initially incorporated into the structure in octahedral sites, but the average Al coordination number (CN) decreases with increasing alumina content and tetrahedral species are the preferred moiety when [O]/[P] > 3.5. Al[4] sites appear to be associated with monophosphate (Q0) anions. The role of modifier size on aluminophosphate structure is investigated. At low alumina content (
Databáze:	OpenAIRE
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