Affordable Access

Access to the full text

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

Authors
  • Zatovsky, I. V.1
  • Ushchapivska, T. I.2
  • Slobodyanik, N. S.1
  • Ogorodnyk, I. V.1
  • 1 Taras Shevchenko National University, Kiev, Ukraine , Kiev (Ukraine)
  • 2 National Agrarian University of Ukraine, Goloseevo, Kiev, 252041, Ukraine , Kiev (Ukraine)
Type
Published Article
Journal
Russian Journal of Inorganic Chemistry
Publisher
Nauka/Interperiodica
Publication Date
Jan 01, 2006
Volume
51
Issue
1
Pages
35–40
Identifiers
DOI: 10.1134/S0036023606010074
Source
Springer Nature
Keywords
License
Yellow

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.

Report this publication

Statistics

Seen <100 times