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Structure and polymorphism of complex phosphates prepared from fluxes of the Na2O-P2O5-Fe2O3-Nb2O5 system

  • Synthesis and Properties of Inorganic Compounds
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Abstract

The phase formation of complex phosphates in the Na2O-P2O5-Fe2O3-Nb2O5 flux system was studied in the ranges of sodium-to-phosphorus ratios of 0.7–1.2 and iron-to-niobium ratios of 0.9–2.7. The crystallization region and crystallization conditions for the compounds of composition Na3−2x Fe2-x Nbx(PO4)3 (0.8 ≤ x < 1.2) were found. These compounds can be prepared in two (hexagonal and monoclinic) polymorphs. Single-crystal X-ray diffraction experiments were carried out for hexagonal NaFeNb(PO4)3 (space group \(R\bar 3\) c, a = 8.590 Å, c = 22.013 Å). The polymorphism in Na3-2x Fe2-x Nbx(PO4)3 complex phosphates is considered as dependent on the preparation parameters.

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Authors and Affiliations

  1. Taras Shevchenko National University, Kiev, Ukraine

    I. V. Zatovsky, N. S. Slobodyanik & I. V. Ogorodnyk

  2. National Agrarian University of Ukraine, Goloseevo, Kiev, 252041, Ukraine

    T. I. Ushchapivska

Authors
  1. I. V. Zatovsky
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  2. T. I. Ushchapivska
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  3. N. S. Slobodyanik
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  4. I. V. Ogorodnyk
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Zatovsky, I.V., Ushchapivska, T.I., Slobodyanik, N.S. et al. Structure and polymorphism of complex phosphates prepared from fluxes of the Na2O-P2O5-Fe2O3-Nb2O5 system. Russ. J. Inorg. Chem. 51, 35–40 (2006). https://doi.org/10.1134/S0036023606010074

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  • DOI: https://doi.org/10.1134/S0036023606010074

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