Journal
SCIENCE
Volume 345, Issue 6200, Pages 1027-1029Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1256224
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Funding
- National Science Foundation [NSF-DMR 1104869]
- Japan Society for Promotion of Science
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1104869] Funding Source: National Science Foundation
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A fundamental mechanistic understanding of the pressure- and/or temperature-induced facile transformation of the coordination environment of boron is important for changing the physical properties of glass. We have used in situ high-pressure (up to 2 gigapascals) boron-11 solid-state nuclear magnetic resonance spectroscopy in combination with ab initio calculations to investigate the nature of the transition state for the pressure-induced BO3 -> BO4 conversion in a borosilicate glass at ambient temperature. The results indicate an anisotropic elastic deformation of the BO3 planar triangle, under isotropic stress, into a trigonal pyramid that likely serves as a precursor for the subsequent formation of a BO4 tetrahedron.
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