Smedskjaer, M.M.; Youngman, R.E.; Striepe, S.; Potuzak, M.; Bauer, Ute et al.: Irreversibility of pressure induced boron speciation change in glass. In: Scientific Reports 4 (2014), 3770. DOI: http://dx.doi.org/10.1038/srep03770
Zusammenfassung: | |
It is known that the coordination number (CN) of atoms or ions in many materials increases through application of sufficiently high pressure. This also applies to glassy materials. In boron-containing glasses, trigonal BO 3 units can be transformed into tetrahedral BO 4 under pressure. However, one of the key questions is whether the pressure-quenched CN change in glass is reversible upon annealing below the ambient glass transition temperature (T g). Here we address this issue by performing 11 B NMR measurements on a soda lime borate glass that has been pressure-quenched at ∼0.6 GPa near T g. The results show a remarkable phenomenon, i.e., upon annealing at 0.9T g the pressure-induced change in CN remains unchanged, while the pressurised values of macroscopic properties such as density, refractive index, and hardness are relaxing. This suggests that the pressure-induced changes in macroscopic properties of soda lime borate glasses compressed up to ∼0.6 GPa are not attributed to changes in the short-range order in the glass, but rather to changes in overall atomic packing density and medium-range structures. | |
Lizenzbestimmungen: | CC BY 3.0 Unported |
Publikationstyp: | Article |
Publikationsstatus: | publishedVersion |
Erstveröffentlichung: | 2014 |
Die Publikation erscheint in Sammlung(en): | Naturwissenschaftliche Fakultät |
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