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Polyhedral Arrangements in Lanthanum Aluminoborate Glasses
Author(s) -
Brow Richard K.,
Tallant David R.,
Turner Gary L.
Publication year - 1997
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.1151-2916.1997.tb02970.x
Subject(s) - magic angle spinning , lanthanum , raman spectroscopy , boron , ternary operation , nuclear magnetic resonance spectroscopy , magic angle , spectroscopy , chemistry , crystallography , analytical chemistry (journal) , materials science , inorganic chemistry , stereochemistry , physics , organic chemistry , quantum mechanics , computer science , optics , programming language
We have used magic‐angle spinning nuclear magnetic resonance (MAS NMR) and Raman spectroscopy to examine the polyhedral arrangements in ternary lanthanum aluminoborate glasses. We have characterized two glass‐forming series: x Al 2 O 3 ·(1− x )LaB 3 O 6 and 0.25La 2 O 3 · y Al 2 O 3 (1− y )‐B 2 O 3 . 11 B MAS NMR reveals a decrease in the fraction of four‐coordinated boron atoms with increases in the Al 2 O 3 content in both series. 27 Al MAS NMR has detected four‐, five‐ and six‐coordinated aluminum atoms in complex aluminoborate networks similar to those reported elsewhere for alkaline‐earth aluminoborate glasses. Raman spectroscopy reveals a variety of borate and aluminoborate moieties, including isolated groups as well as methaborate chains and rings. These results indicate that the La 3+ ion acts as a modifier to the aluminoborate network.