Structural Similarity on Multiple Length Scales and Its Relation to Devitrification Mechanism: A Solid-State NMR Study of Alkali Diborate Glasses and Crystals
| Autor: | Marcio Luis Ferreira Nascimento, Banghao Chen, Ulrike Werner-Zwanziger, Luciana Ghussn, Edgar Dutra Zanotto, Josef W. Zwanziger |
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| Rok vydání: | 2009 |
| Předmět: |
Work (thermodynamics)
Chemistry Structural similarity Resonance Alkali metal Surfaces Coatings and Films Electronic Optical and Magnetic Materials Crystal General Energy Nuclear magnetic resonance Devitrification Solid-state nuclear magnetic resonance Chemical physics Phase (matter) Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Physical Chemistry C. 113:20725-20732 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | The nature of the devitrification process is a fundamental problem in glass science and governs the ultimate stability of glass. It is hypothesized that the devitrification mechanism of a given glass composition is strongly correlated with the extent of structural similarity at the intermediate-range level between the glass and crystal phase to which it transforms. However, relatively little information is available to test this hypothesis because of the lack of long-range periodicity in glass and the absence of effective analysis methods. In this work Li2O−2B2O3 (L2B) and Na2O−2B2O3 (N2B) glasses, which respectively exhibit homogeneous (internal) and heterogeneous (surface) devitrification mechanisms, and corresponding crystals were prepared and comprehensively studied by using multiple solid state NMR techniques. Of those, 11B MAS and MQMAS experiments were applied to reveal short-range order information; 7Li and 23Na spin−echo decay and 11B{6Li} and 11B{23Na} rotational echo double resonance (REDOR) ex... |
| Databáze: | OpenAIRE |
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