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


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Article Info

DATE

2006-01

AUTHORS

I. V. Zatovsky, T. I. Ushchapivska, N. S. Slobodyanik, I. V. Ogorodnyk

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 Na3−2xFe2-xNbx(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 \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$R\bar 3$$ \end{document}c, a = 8.590 Å, c = 22.013 Å). The polymorphism in Na3-2xFe2-xNbx(PO4)3 complex phosphates is considered as dependent on the preparation parameters. More... »

PAGES

35-40

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0036023606010074

DOI

http://dx.doi.org/10.1134/s0036023606010074

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1029348485


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