Volume 59, Number 5, September 2002
|Page(s)||708 - 713|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Structure, structural relaxation and ion diffusion in sodium disilicate melts
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: firstname.lastname@example.org
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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