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An X-ray Rietveld and infrared spectral study of the Na2(Mn1–xM2+x )Fe2+Fe3+(PO4)3 (x = 0 to 1 and M2+ = Mg, Cd) alluaudite-type solid solutions

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Published/Copyright: April 2, 2015
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American Mineralogist
From the journal American Mineralogist Volume 95 Issue 5-6

Abstract

Compounds of the Na2(Mn1-xM2+ x)Fe2+Fe3+(PO4)3 (M2+ = Mg, Cd, Ca, Ni, Zn) alluaudite-type solid solutions were synthesized by hydrothermal techniques at 1 kbar, between 400 and 600 °C, and were investigated by X-ray powder diffraction and infrared spectroscopy. The site occupancy factors of the Na2(Mn1-xCdx)Fe2+Fe3+(PO4)3 compounds, obtained from the Rietveld refinements of the X-ray powder patterns, indicate that the replacement of Mn by Cd mainly takes place on the M1 site. Small amounts of Cd were also detected on the A1 site, compensated by small amounts of Na occurring on M1. The cationic distributions in the Na2(Mn1-xMgx)Fe2+Fe3+(PO4)3 solid solution show a partially disordered distribution of Fe and Mg over the M1 and M2 crystallographic sites. The unit-cell parameters increase significantly when Mn is replaced by Ca or Cd, and decrease significantly when it is replaced by Ni, Mg, or Zn. The infrared spectra show the displacement of two absorption band at ca. 405-445 cm-1 and 595-610 cm-1, which are assigned to the vibrations of the M2+ cations localized on the M1 and M2 sites, respectively. This assignment is confirmed by the excellent correlations between the average ionic radius of the cations occurring on the M sites, and the energy of the absorption band.

Keywords: Crystal chemistry; divalent cation; alluaudite structure; Na-Mn-Fe-phosphate
Received: 2009-8-6
Accepted: 2010-1-14
Published Online: 2015-4-2
Published in Print: 2010-5-1

© 2015 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am.2010.3367
Keywords for this article
Crystal chemistry; divalent cation; alluaudite structure; Na-Mn-Fe-phosphate

Articles in the same Issue

  1. TEM-assisted dynamic scanning force microscope imaging of (001) antigorite: Surfaces and steps on a modulated silicate
  2. PH₂O-dependent structural phase transitions in the zeolite mesolite: Real- and reciprocal-space crystal structure refinements
  3. The crystal structure of esperite, with a revised chemical formula, PbCa2(ZnSiO4)3, isostructural with beryllonite
  4. Dendritic zircon formation by deterministic volume-filling fractal growth: Implications for the mechanisms of branch formation in dendrites
  5. Enthalpies of formation of pyrrhotite Fe1–0.125xS (0 ≤ x ≤ 1) solid solutions
  6. Crystal chemistry of synthetic lawsonite solid-solution series CaAl2[(OH)2/Si2O7]·H2O– SrAl2[(OH)2/Si2O7]·H2O and the Cmcm–P21/m phase transition
  7. Coulsellite, CaNa3AlMg3F14, a rhombohedral pyrochlore with 1:3 ordering in both A and B sites, from the Cleveland Mine, Tasmania, Australia
  8. Synthesis and characterization of zeolite 4A-type desiccant from kaolin
  9. Effect of iron on the compressibility of hydrous ringwoodite
  10. Kapundaite, (Na,Ca)2Fe4 3+(PO4)4(OH)3·5H2O, a new phosphate species from Toms quarry, South Australia: Description and structural relationship to mélonjosephite
  11. Rate of antigorite dehydration at 2 GPa applied to subduction zones
  12. IR absorption coefficients for water in nominally anhydrous high-pressure minerals
  13. Experimental techniques for determining tin solubility in silicate melts using silica capsules in 1 atm furnaces and rhenium capsules in the piston cylinder
  14. Cassiterite-saturated minimum melting behavior within Sn-SnO2-SiO2 at 1 atm and 10 kbar
  15. Cr-bearing tourmaline associated with emerald deposits from Swat, NW Pakistan: Genesis and its exploration significance
  16. Mechanism and kinetics of reduction of a FeO-Fe2O3-CaO-MgO aluminosilicate melt in a high-CO-activity environment
  17. Biodurability of chrysotile and tremolite asbestos in simulated lung and gastric fluids
  18. High-pressure behavior of Ca/Na clinopyroxenes: The effect of divalent and trivalent 3d-transition elements
  19. Uvarovite from chromite-bearing ultramafic intrusives, Orissa, India, a crystal-chemical characterization using 57Fe Mössbauer spectroscopy
  20. An X-ray Rietveld and infrared spectral study of the Na2(Mn1–xM2+x )Fe2+Fe3+(PO4)3 (x = 0 to 1 and M2+ = Mg, Cd) alluaudite-type solid solutions
  21. Dissolution kinetics of anorthite in a supercritical CO2–water system
  22. Evaluation of the elasticity normal to the basal plane of non-expandable 2:1 phyllosilicate minerals by nanoindentation
  23. 57Fe Mössbauer spectroscopy and electrical resistivity studies on naturally occurring native iron under high pressures up to 9.1 GPa
  24. Letter. Discreditation of paraspurrite
  25. Letter. High-pressure magnetic transition in hcp-Fe
  26. Letter. Reduced As components in highly oxidized environments: Evidence from full spectral XANES imaging using the Maia massively parallel detector
  27. Letter. FTIR spectroscopy with a focal plane array detector: A novel tool to monitor the spatial OH-defect distribution in single crystals applied to synthetic enstatite
  28. Letter. Akaogiite: An ultra-dense polymorph of TiO2 with the baddeleyite-type structure, in shocked garnet gneiss from the Ries Crater, Germany
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