NMR spectroscopy has proven invaluable in understanding the short- and intermediate-range structure in inorganic glasses, aided greatly by the development of magic-angle spinning and other high-resolution methods. The ability to determine coordination numbers of glass-forming cations like B and Al, as well as the connectivity of silicate and phosphate polyhedra, has resulted in substantial structure/property understanding, leading to new glass compositions for a variety of technological uses. Glass-ceramics, which are initially formed as traditional melt-quenched glasses and then partially crystallized through controlled heating, have also been of significant commercial and scientific interest. Traditional characterization of glass-ceramics is based on other techniques, principally x-ray diffraction and electron microscopy. However, these approaches tend to focus mainly on the crystalline phases, ignoring the parent glass and after crystallization, the residual glass in glass-ceramics. Since NMR spectroscopy does not require long-range periodicity or a minimum crystallite size and concentration, this technique is well positioned to study all aspects of glass-ceramics, including especially the glass and crystalline phases present in the material. This presentation will cover a broad range of topics, including a comprehensive examination of element partitioning in β-spodumene glass-ceramics (CorningWare®), residual glass characterization, and the application of NMR in understanding nucleation and crystal growth in binary P2O5-SiO2 and binary barium silicate glasses.

Glass-ceramic understanding from NMR spectroscopy

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.