Polyhedral arrangements in lanthanum aluminoborate glasses

Journal Article · Thu May 01 04:00:00 EDT 1997 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1997.tb02970.x· OSTI ID:512060

Brow, R K; Tallant, D R ^[1]; Turner, G L ^[2]

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1. Sandia National Labs., Albuquerque, NM (United States)
2. Spectral Data Services, Champaign, IL (United States)

The authors have used magic-angle spinning nuclear magnetic resonance (MAS NMR) and Raman spectroscopy to examine the polyhedral arrangements in ternary lanthanum aluminoborate glasses. They have characterized two glass-forming series: xAl{sub 2}O{sub 3}{center_dot}(1{minus}x)LaB{sub 3}O{sub 6} and 0.25 La{sub 2}O{sub 3}{center_dot}yAl{sub 2}O{sub 3}{center_dot}(1{minus}y)-B{sub 2}O{sub 3}. {sup 11}B MAS NMR reveals a decrease in the fraction of four-coordinated boron atoms with increases in the Al{sub 2}O{sub 3} content in both series. {sup 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{sup 3+} ion acts as a modifier to the aluminoborate network.

• Research Organization: Sandia National Laboratory
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 512060
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 5 Vol. 80; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
BORATES
GLASS
LANTHANUM OXIDES
MICROSTRUCTURE
NMR SPECTRA
RAMAN SPECTRA