Nature of alumina in phosphate glass: II, structure of sodium aluminophosphate glass

Journal Article · Thu Apr 01 00:00:00 EST 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb05316.x· OSTI ID:6219724

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

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1. Sandia National Lab., Albuquerque, NM (United States). Glass and Electronic Ceramics Dept.
2. Univ. of Illinois, Urbana, IL (United States). Dept. of Geology
3. Spectral Data Services, Champaign, IL (United States)

The authors have used [sup 27]Al and [sup 31]P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy and X-ray photoelectron spectroscopy (XPS) to describe quantitatively the relationships between the composition, structure, and properties of glasses in the Na[sub 2]O[center dot]Al[sub 2]O[sub 3][center dot]P[sub 2]O[sub 5] (NAP) system. In general, the glass properties (evaluated in part 1) are most sensitive to changes in Al coordination. [sup 27]Al MAS NMR spectra reveal that octahedrally coordinated Al is most abundant in glasses with O/P ratios less than 3.5, the pyrophosphate structural limit. Tetrahedrally coordinated Al is most abundant in glasses with O/P greater than 3.5. Decreasing Al(OP)[sub 6]/Al(OP)[sub 4] ratio generally correlates with decreasing glass transition temperature and refractive index. The compositional dependence of glass structure and properties can be qualitatively understood using a crystal chemical model based on oxygen charge balancing by the different Al and P moieties.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6219724
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 76:4; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM PHOSPHATES
CRYSTAL STRUCTURE
PHOSPHATE GLASS
SODIUM PHOSPHATES
ALUMINIUM 27
ALUMINIUM OXIDES
CHEMICAL PROPERTIES
COORDINATES
CRYSTAL MODELS
EXPERIMENTAL DATA
MATHEMATICAL MODELS
MOLECULAR STRUCTURE
NUCLEAR MAGNETIC RESONANCE
PHOSPHORUS 31
PHOTOELECTRON SPECTROSCOPY
PHYSICAL PROPERTIES
PYROPHOSPHATES
REFRACTIVE INDEX
STRUCTURE FACTORS
TRANSITION TEMPERATURE
X-RAY SPECTROSCOPY
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM ISOTOPES
CHALCOGENIDES
DATA
ELECTRON SPECTROSCOPY
GLASS
INFORMATION
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHOSPHORUS ISOTOPES
RESONANCE
SODIUM COMPOUNDS
SPECTROSCOPY
STABLE ISOTOPES
THERMODYNAMIC PROPERTIES
360602* - Other Materials- Structure & Phase Studies