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A structural analysis of lead hydroxyvanadinite.

Jean Guillaume Eon1, Carlos Bauer Boechat, Alexandre Malta Rossi

  • 1Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.

Physical Chemistry Chemical Physics : PCCP
|April 25, 2006
PubMed
Summary

Hydroxyvanadinite, a lead vanadate mineral, was synthesized and structurally characterized. Its crystal structure closely resembles vanadinite, providing insights into lead-vanadium-oxide compounds.

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Area of Science:

  • Mineralogy and crystallography
  • Solid-state chemistry
  • Materials science

Background:

  • Vanadinite (Pb10(VO4)6Cl2) is a well-known lead vanadate mineral.
  • Understanding related structures like hydroxyvanadinite is crucial for materials science and mineralogy.
  • The hydroxyl group (OH) in hydroxyvanadinite presents unique structural and chemical properties compared to chloride in vanadinite.

Purpose of the Study:

  • To synthesize hydroxyvanadinite (Pb10(VO4)6(OH)2) using a co-precipitation method.
  • To elucidate the crystal structure and electronic properties of hydroxyvanadinite.
  • To investigate the interaction of lead (Pb) with the hydroxyl (OH) channel anion.

Main Methods:

  • Co-precipitation method for synthesis.
  • X-ray absorption spectroscopy (XANES, EXAFS) for elemental and electronic structure analysis.

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  • Infrared spectroscopy, Raman scattering, and X-ray diffraction (XRD) for structural characterization.
  • Rietveld refinement for precise structural determination.
  • First-principles Density Functional Theory (DFT) embedded cluster and periodic band structure models for electronic structure analysis.

    • Main Results:

    • Hydroxyvanadinite was successfully synthesized.
    • The crystal structure is similar to vanadinite, with space group P6(3)/m and cell parameters a = 10.2242(3) Å and c = 7.4537(2) Å.
    • Detailed analysis of electronic structures, bonding, and densities of states was performed.
    • The interaction between Pb and the OH channel anion was identified as a significant structural feature.

    Conclusions:

    • Hydroxyvanadinite shares structural similarities with vanadinite but incorporates hydroxyl groups.
    • The study provides a comprehensive characterization of hydroxyvanadinite's structure and electronic properties.
    • The findings contribute to the understanding of lead vanadate mineral chemistry and related materials.