Details
| Original language | English |
|---|---|
| Article number | 104504 |
| Journal | Journal of Chemical Physics |
| Volume | 131 |
| Issue number | 10 |
| Publication status | Published - 2009 |
Abstract
Aluminoborosilicate melts of E-glass composition have been compressed at pressures up to 500 MPa and subsequently cooled (4-5 K min-1) under pressure from well above the glass transition to room temperature. It is found that increasing uniaxial pressure lead to anisotropic glasses with increasing permanent birefringence, while increasing isostatic pressure resulted in isotropic glasses with increasing density (compaction of 2.1% at 500 MPa). Static and magic-angle spinning nuclear magnetic resonance spectroscopy of 11B, 23Na, 27Al, and 29Si were performed to explore pressure-induced changes in the short-range structure of these glasses. NMR experiments readily detected increasing IVB, VAl, and VIAl concentrations with pressure as well as a decrease in the mean distance of sodium to oxygen atoms (0.7% at 500 MPa), but no detectible evidence of short-range structural orientation around these atoms in the birefringent glasses were found. Quantifying the changes in the local boron, aluminum, silicon, and sodium environments revealed that the measured increase of recovered density with pressure in E-glass can only be partly explained by increase in B and Al coordination, and that overall compression of the network and of the network modifier cation volumes must also be important. Structural changes in the intermediate range, which were not detected by NMR, are discussed as a source of birefringence in anisotropic E-glass.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: Journal of Chemical Physics, Vol. 131, No. 10, 104504, 2009.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Structural response of a highly viscous aluminoborosilicate melt to isotropic and anisotropic compressions
AU - Wu, Jingshi
AU - Deubener, Joachim
AU - Stebbins, Jonathan F.
AU - Grygarova, Lenka
AU - Behrens, Harald
AU - Wondraczek, Lothar
AU - Yue, Yuanzheng
N1 - Funding Information: J.D. and L.G. thank the Deutsche Forschungsgemeinschaft (DFG) for financial support (Grant No. DE598/8-1). J.W. and J.F.S. acknowledge the support of the U.S. National Science Foundation, Grant No. DMR 0404972. L.W. thanks the DFG for further financial support under Grant No. WO1220/3-1. We thank N. Kim for assistance with XRD and D. Massiot (CNRS, Orléans, France) for making the “ DMFIT ” software freely available.
PY - 2009
Y1 - 2009
N2 - Aluminoborosilicate melts of E-glass composition have been compressed at pressures up to 500 MPa and subsequently cooled (4-5 K min-1) under pressure from well above the glass transition to room temperature. It is found that increasing uniaxial pressure lead to anisotropic glasses with increasing permanent birefringence, while increasing isostatic pressure resulted in isotropic glasses with increasing density (compaction of 2.1% at 500 MPa). Static and magic-angle spinning nuclear magnetic resonance spectroscopy of 11B, 23Na, 27Al, and 29Si were performed to explore pressure-induced changes in the short-range structure of these glasses. NMR experiments readily detected increasing IVB, VAl, and VIAl concentrations with pressure as well as a decrease in the mean distance of sodium to oxygen atoms (0.7% at 500 MPa), but no detectible evidence of short-range structural orientation around these atoms in the birefringent glasses were found. Quantifying the changes in the local boron, aluminum, silicon, and sodium environments revealed that the measured increase of recovered density with pressure in E-glass can only be partly explained by increase in B and Al coordination, and that overall compression of the network and of the network modifier cation volumes must also be important. Structural changes in the intermediate range, which were not detected by NMR, are discussed as a source of birefringence in anisotropic E-glass.
AB - Aluminoborosilicate melts of E-glass composition have been compressed at pressures up to 500 MPa and subsequently cooled (4-5 K min-1) under pressure from well above the glass transition to room temperature. It is found that increasing uniaxial pressure lead to anisotropic glasses with increasing permanent birefringence, while increasing isostatic pressure resulted in isotropic glasses with increasing density (compaction of 2.1% at 500 MPa). Static and magic-angle spinning nuclear magnetic resonance spectroscopy of 11B, 23Na, 27Al, and 29Si were performed to explore pressure-induced changes in the short-range structure of these glasses. NMR experiments readily detected increasing IVB, VAl, and VIAl concentrations with pressure as well as a decrease in the mean distance of sodium to oxygen atoms (0.7% at 500 MPa), but no detectible evidence of short-range structural orientation around these atoms in the birefringent glasses were found. Quantifying the changes in the local boron, aluminum, silicon, and sodium environments revealed that the measured increase of recovered density with pressure in E-glass can only be partly explained by increase in B and Al coordination, and that overall compression of the network and of the network modifier cation volumes must also be important. Structural changes in the intermediate range, which were not detected by NMR, are discussed as a source of birefringence in anisotropic E-glass.
UR - http://www.scopus.com/inward/record.url?scp=70349278626&partnerID=8YFLogxK
U2 - 10.1063/1.3223282
DO - 10.1063/1.3223282
M3 - Article
AN - SCOPUS:70349278626
VL - 131
JO - Journal of Chemical Physics
JF - Journal of Chemical Physics
SN - 0021-9606
IS - 10
M1 - 104504
ER -