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diffusive_motion_in_alkali_silicate_melts_an_nmr_study_at_high_temperature.pdf
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🔗 Source: pines.berkeley.edu
📊 Size: 1.92 MB
📄 Pages: 12 pages
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Nuclear magnetic resonance (NMR) spectroscopy at high temperature is used to study atomic scale diffusive processes in molten silicates, which control their transport and thermodynamic properties. 23Na and 29Si NMR data on lineshapes, spin-lattice, and spin-spin relaxation times in alkali silicate and aluminosilicate melts from room temperature to about 1200°C show that exchange of oxygens between bridging and non-bridging sites takes place at the microsecond to nanosecond time scale, making silicate "molecules" very short-lived. The motion causing relaxation is closely related to through-going diffusion, and the mixed-alkali effect is detectable in activation energies. The mechanism for 29Si spin-lattice relaxation changes at or near the glass transition, showing a close link between local diffusive motion and bulk thermodynamic properties.

Description

Nuclear magnetic resonance (NMR) spectroscopy at high temperature is used to study atomic scale diffusive processes in molten silicates, which control their...

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  • File Format: PDF
  • File Size: 1.92 MB
  • Pages: 12
  • Language: EN
  • Total Downloads: 65
  • Last Updated: 4 weeks ago

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