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Science 5 February 1993:
Vol. 259. no. 5096, pp. 786 - 788
DOI: 10.1126/science.259.5096.786
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Articles

Magnesium and Calcium Aluminate Liquids: In Situ High-Temperature 27Al NMR Spectroscopy

B. T. Poe 1, P. F. McMillan 1, B. Coté 2, D. Massiot 3, and J. P. Coutures 3

1 Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287
2 St. Gobain Recherche, 39 quai Lucien Lefranc BP 135, 93303 Aubervilliers, Cedex, France
3 Centre de Recherches sur la Physique des Hautes Températures, Centre National de la Recherche Scientifique 1D, Avenue de la Recherche Scientifique, 45071 Orléans Cedex, France

The use of high-temperature nuclear magnetic resonance (NMR) spectroscopy provides a means of investigating the structure of refractory aluminate liquids at temperatures up to 2500 K. Time-averaged structural information indicates that the average aluminum coordination for magnesium aluminate (MgAl2O4) liquid is slightly greater than for calcium aluminate (CaAl2O4) liquid and that in both liquids it is close to four. Ion dynamics simulations for these liquids suggest the presence of four-, five-, and six-coordinated aluminate species, in agreement with NMR experiments on fast-quenched glasses. These species undergo rapid chemical exchange in the high-temperature liquids, which is evidenced by a single Lorentzian NMR line.

Submitted on September 17, 1992
Accepted on November 30, 1992


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