Al3+ coordination changes in liquid aluminosilicates under pressure

Al3+ coordination changes in liquid aluminosilicates under pressure


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ABSTRACT Geochemists often debate the conditions in which Al3+ may become 6-coordinated in molten silicates and how such liquid structures are related to those of coexisting crystal


phases1–4. To date no experimental evidence for the occurrence of Al3+ in this coordination state has been presented and computer simulation studies have suggested that pressures exceeding


100 kbar may be required for the 4→6 conversion5,6. To examine this question in the laboratory, we have taken advantage of the ability of the glass transition to freeze the structural


equilibrium of a high-pressure melt and preserve it for subsequent examination in ambient conditions. Glasses of albite composition have been prepared by quenching melts under pressures of


0–80 kbar (0–8 GPa). The Al3+ coordination has been determined by 27Al solid-state NMR spectrometry. We find that the 4-coordinated state is retained to pressures well beyond 30 kbar. A new


peak at −16 p.p.m. relative to Al(H2O)3+6, which we associate with octahedral Al3+ appears weakly at 60 kbar and becomes a prominent feature of the spectrum at 80 kbar. Access through your


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of Science, Ehime University, Matsuyama, 790, Japan AUTHORS AND AFFILIATIONS * Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia Eiji Ohtani *


Laboratoire de Physique Thermique, ESPCI, 10 Rue Vauquelin, 75005, Paris, France Francis Taulelle * Department of Chemistry, Purdue University, West Lafayette, Indiana, 47907, USA C. Austen


Angell Authors * Eiji Ohtani View author publications You can also search for this author inPubMed Google Scholar * Francis Taulelle View author publications You can also search for this


author inPubMed Google Scholar * C. Austen Angell View author publications You can also search for this author inPubMed Google Scholar RIGHTS AND PERMISSIONS Reprints and permissions ABOUT


THIS ARTICLE CITE THIS ARTICLE Ohtani, E., Taulelle, F. & Angell, C. Al3+ coordination changes in liquid aluminosilicates under pressure. _Nature_ 314, 78–81 (1985).


https://doi.org/10.1038/314078a0 Download citation * Received: 16 July 1984 * Accepted: 10 December 1984 * Issue Date: 07 March 1985 * DOI: https://doi.org/10.1038/314078a0 SHARE THIS


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