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Synthesis of anorthite by the Pechini process and structural investigation of the hexagonal phase

Published online by Cambridge University Press:  31 January 2011

Seong-Hyeon Hong ,
J. Francis Young ,
Ping Yu  and
R. James Kirkpatrick
Seong-Hyeon Hong
Affiliation:
Center for Cement Composite Materials, University of Illinois at Urbana–Champaign, Urbana, Illinois 61801
J. Francis Young
Affiliation:
Center for Cement Composite Materials and Department of Materials Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, Illinois 61801
Ping Yu
Affiliation:
Center for Cement Composite Materials and Department of Materials Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, Illinois 61801
R. James Kirkpatrick
Affiliation:
Center for Cement Composite Materials and Department of Geology, University of Illinois at Urbana–Champaign, Urbana, Illinois 61801
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Abstract

Stoichiometric CaAl2Si2O8 gels prepared by the Pechini process crystallize to triclinic anorthite via an intermediate, previously unknown pseudohexagonal phase. Hydrothermal treatment of this pseudohexagonal phase at 350 °C transforms it to hexagonal anorthite. These combined processes produce the hexagonal phase via a low-temperature, chemical route in contrast to the conventional high-temperature melting and crystallization method. Powder x-ray diffraction data and nuclear magnetic resonance (NMR) spectra of the hexagonal anorthite agree well with the published structure. They indicate a high degree of tetrahedral Si/Al ordering within the layers, but long-range disorder in the average structure due to (001) stacking faults present between the layers.

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Type
Articles
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Journal of Materials Research , Volume 14 , Issue 5 , May 1999 , pp. 1828 - 1833
Copyright
Copyright © Materials Research Society 1999

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