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

  • Journal of Materials Research
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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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Authors and Affiliations

  1. Center for Cement Composite Materials, University of Illinois at Urbana–Champaign, Urbana, Illinois, 61801, USA

    Seong-Hyeon Hong

  2. Center for Cement Composite Materials and Department of Materials Science and Engineering, University of Illinois at Urbana–Champaign, Urbana, Illinois, 61801, USA

    J. Francis Young & Ping Yu

  3. Center for Cement Composite Materials and Department of Geology, University of Illinois at Urbana–Champaign, Urbana, Illinois, 61801, USA

    R. James Kirkpatrick

Authors
  1. Seong-Hyeon Hong
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  2. J. Francis Young
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  3. Ping Yu
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  4. R. James Kirkpatrick
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Hong, SH., Young, J.F., Yu, P. et al. Synthesis of anorthite by the Pechini process and structural investigation of the hexagonal phase. Journal of Materials Research 14, 1828–1833 (1999). https://doi.org/10.1557/JMR.1999.0246

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  • DOI: https://doi.org/10.1557/JMR.1999.0246

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