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A Raman Study of Iron–Phosphate Crystalline Compounds and Glasses

Authors

  • Liying Zhang,

    1. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla 65409, Missouri
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    • *Member, The American Ceramic Society.

  • Richard K. Brow

    Corresponding author
    1. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla 65409, Missouri
      †Author to whom correspondence should be addressed. e-mail: brow@mst.edu
    Search for more papers by this author
    • *Member, The American Ceramic Society.


  • L. Pinckney—contributing editor

  • This work was supported by the National Science Foundation under Grant No. DMR-0305202 and DMR-0502463.

†Author to whom correspondence should be addressed. e-mail: brow@mst.edu

Abstract

Ferrous and ferric phosphate crystalline compounds and glasses were studied using Raman spectroscopy. A comparison of the spectra from crystalline and glassy ortho-, pyro-, and metaphosphates indicates that similar phosphate anions constitute the structures of the respective materials, and some information about the compositional dependence of the phosphate-site distributions in the glasses can be gleaned from relative peak intensities. A correlation exists between the average P–O bond distance and the Raman peak frequencies in the crystalline compounds, and this correlation is used to provide information about the structures of the iron phosphate glasses. For example, the average P–O bond distance is estimated to decrease from about 1.57 Å for iron metaphosphate glasses (O/P∼3.0) to 1.54 Å for iron orthophosphate glasses (O/P∼4.0). These bond distances are in good agreement with those reported from diffraction studies of similar glasses.

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