Issue |
Europhys. Lett.
Volume 59, Number 5, September 2002
|
|
---|---|---|
Page(s) | 708 - 713 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2002-00183-2 | |
Published online | 01 September 2002 |
Structure, structural relaxation and ion diffusion in sodium disilicate melts
1
Physik Department E 13, Technische Universität
München 85747 Garching, Germany
2
Institut Laue-Langevin - 38042 Grenoble, France
3
Institut für Mineralogie, Petrologie und Geochemie
Universität München - 80333 München, Germany
Corresponding author: ameyer@ph.tum.de
Received:
10
January
2002
Accepted:
10
June
2002
We have investigated Na2Si2O5 melts with inelastic neutron scattering
at temperatures up to 1600 K.
The Si-O network relaxes on a time scale of ns, whereas the Na ion
relaxation dynamics are found on a time scale of 10 ps.
The elastic structure factor exhibits at Å-1 an emerging
prepeak which becomes more pronounced with increasing temperature.
The prepeak is caused by the formation of sodium-rich regions
in the partially disrupted Si-O tetrahedral network.
PACS: 61.20.Qg – Structure of associated liquids: electrolytes, molten salts, etc / 66.10.-x – Diffusion and ionic conduction in liquids / 61.12.-q – Neutron diffraction and scattering
© EDP Sciences, 2002
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