Local structure of xAl sub 2 O sub 3 ter dot (1 minus ital x)NaPO sub 3 glasses; An NMR and XPS study

Journal Article · Wed Aug 01 04:00:00 EDT 1990 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb07591.x· OSTI ID:5854790

Brow, R K ^[1]; Kirkpatrick, R J ^[2]; Turner, G L ^[3]

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1. Sandia National Labs., Albuquerque, NM (USA)
2. Illinois Univ., Urbana, IL (USA). Dept. of Geology
3. Spectral Data Services, Champaign, IL (USA)

A series of xAl{sub 2}O{sub 3} {circle dot} (1 {minus} x)NaPO{sub 3} glasses (0 {le} x {le} 0.275) were prepared and characterized by magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy and by X-ray photoelectron spectroscopy (XPS). Al MAS NMR spectra reveal that: at low alumina contents (x {lt} 0.125), Al(OP){sub 6} structural environments; in glasses with x {gt} 0.125, Al(OP){sub 4} environments are increasingly favored; and at x = 0.275, most Al is tetrahedrally coordinated. 5-coordinated Al environments also appear to be present. Variations in the {sup 31}P MAS NMR spectra are consistent with bonding between neighboring P and Al polyhedra. Quantitative changes in the oxygen bonding, determined from the O 1s spectra obtained by XPS, also reflect these structural changes. The effects of alumina content on the relative concentration of nonbridging oxygen (PO{sup {minus}}) are quantitatively described by a simple structural model derived from the MAS NMR data. The thermal expansion coefficients and glass transition temperatures are shown to be sensitive to these structural changes.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 5854790
• Journal Information: Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 73:8; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
EXPANSION
GLASS
ISOTOPES
LIGHT NUCLEI
MICROSTRUCTURE
NMR SPECTRA
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOSPHATE GLASS
PHOSPHORUS 31
PHOSPHORUS ISOTOPES
PHYSICAL PROPERTIES
SPECTRA
STABLE ISOTOPES
THERMAL EXPANSION
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
X-RAY SPECTRA