Al3+ coordination changes in liquid aluminosilicates under pressure

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

institution Buy or subscribe This is a preview of subscription content, access via your institution ACCESS OPTIONS Access through your institution Subscribe to this journal Receive 51 print

issues and online access $199.00 per year only $3.90 per issue Learn more Buy this article * Purchase on SpringerLink * Instant access to full article PDF Buy now Prices may be subject to

local taxes which are calculated during checkout ADDITIONAL ACCESS OPTIONS: * Log in * Learn about institutional subscriptions * Read our FAQs * Contact customer support SIMILAR CONTENT

BEING VIEWED BY OTHERS RESOLVING INTERMEDIATES DURING THE GROWTH OF ALUMINUM DEUTEROXIDE (HYDROXIDE) POLYMORPHS IN HIGH CHEMICAL POTENTIAL SOLUTIONS Article Open access 04 September 2024

INSIGHTS ON THE DISSOLUTION OF WATER IN AN ALBITE MELT AT HIGH PRESSURES AND TEMPERATURES FROM A DIRECT STRUCTURAL ANALYSIS Article Open access 10 March 2023 HIGH-TEMPERATURE STRUCTURAL

DISORDERS STABILIZE HYDROUS ALUMINOSILICATES IN THE MANTLE TRANSITION ZONE Article Open access 26 January 2025 REFERENCES * Waff, H. S. _Geophys. J. Res. Lett._ 2, 193–196 (1975). Article 

ADS  CAS  Google Scholar  * Velde, B. & Kushiro, I. _Yb. Carnegie Instn. Wash._ 75, 618–620 (1975). Google Scholar  * Sharma, S. K., Virgo, D. & Kuchiro, I. _Am. Miner._ 64, 779–787

(1979); _J. non-cryst. Solids_ 33, 235–248 (1979). CAS  Google Scholar  * De Jong, B. H. W. S., Schramm, C. M. & Paziale, V. E. _Geochim. cosmochim. Acta_ 47, 1223–1236 (1983). Article 

ADS  CAS  Google Scholar  * Angell, C. A., Cheeseman, P. A. & Tamaddon, S. _Science_ 218, 885–887 (1982). Article  ADS  CAS  Google Scholar  * Angell, C. A., Cheeseman, P. A. &

Tamaddon, S. _Bull. Miner._ 1–2, 87–99 (1983). Article  Google Scholar  * Renniger, A. L. & Uhlmann, D. R. _J. non-cryst. Solids_ 16, 325–327 (1974). Article  ADS  Google Scholar  *

Buccaro, J. A. & Dardy, H. D. _J. non-cryst. Solids_ 20, 149–151 (1976). Article  ADS  Google Scholar  * Laberge, N. L., Vasilescu, V. V., Montrose, C. J. & Macedo, P. B. _J. Am.

ceram. Soc._ 56, 506–509 (1973). Article  CAS  Google Scholar  * Landau, L. & Lifschitz, E. M., _Statistical Physics_. Ch. 12 (Pergamon, London, 1958). Google Scholar  * Ohtani, E. _J.

Phys. Earth_ 27, 189–208 (1979). Article  CAS  Google Scholar  * Barkatt, R. & Angell, C. A. _J. chem. Phys._ 70, 901–911 (1979). Article  ADS  CAS  Google Scholar  * Müller, D. _Phys.

Chem. Glasses_ 24, 37–42 (1983). ADS  Google Scholar  * Müller, D., Gessner, W., Behrens, H. J. & Scheler, G. _Chem. Phys. Lett._ 79, 59–62 (1981). Article  ADS  Google Scholar  *

Müller, D., Hoebbel, D. & Gessner, W. _Chem. Phys. Lett._ 84, 25–28 (1981). Article  ADS  Google Scholar  * Woodcock, L. V., Angell, C. A. & Cheeseman, P. A. _J. chem. Phys._ 65,

1565–1577 (1976). Article  ADS  CAS  Google Scholar  * Kushiro, I. _Geochim. cosmochim. Acta_ 47, 1415–1422 (1983). Article  ADS  CAS  Google Scholar  * Bell, P. M. & Roseboom, E. H.

_Miner. Soc Am. spec. Pap._ 2, 151–161 (1969). CAS  Google Scholar  Download references AUTHOR INFORMATION Author notes * Eiji Ohtani Present address: Department of Earth Sciences, Faculty

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

ARTICLE Anyone you share the following link with will be able to read this content: Get shareable link Sorry, a shareable link is not currently available for this article. Copy to clipboard

Provided by the Springer Nature SharedIt content-sharing initiative