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Related Experiment Videos

A new whitlockite, Ca8.42Na1.16V(PO4)7.

Alexander A Tsirlin1, Evgeny V Dikarev, Roman V Shpanchenko

  • 1Department of Chemistry, Moscow State University, 119992 Moscow, Russian Federation.

Acta Crystallographica. Section C, Crystal Structure Communications
|February 4, 2006
PubMed
Summary

Researchers synthesized a new calcium sodium vanadium phosphate crystal. This whitlockite-structured material features vanadium ions in octahedral sites and complex calcium and sodium ion coordination.

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Materials science

Background:

  • Complex phosphates are crucial in various scientific fields.
  • Understanding novel crystal structures provides insights into material properties.
  • Whitlockite-type structures are known for their diverse ionic substitutions.

Purpose of the Study:

  • To synthesize and characterize a new complex phosphate compound.
  • To determine the crystal structure and cation coordination of Ca8.42Na1.16V(PO4)7.
  • To investigate the site occupancy of vanadium, calcium, and sodium ions.

Main Methods:

  • Single crystals were grown from a melt under an inert atmosphere.
  • Crystal structure was determined using X-ray diffraction.

Related Experiment Videos

  • Rhombohedral (R3c) symmetry and whitlockite structure type were identified.

    • Main Results:

    • A new compound, calcium sodium vanadium phosphate (Ca8.42Na1.16V(PO4)7), was successfully synthesized.
    • Vanadium(III) ions occupy regular octahedral sites (M5).
    • Calcium ions are in eight- and nine-coordinated sites, while sodium ions partially occupy an octahedral site and share a nine-coordinated site with calcium.

    Conclusions:

    • The study reports the successful synthesis and structural characterization of a novel calcium sodium vanadium phosphate.
    • The crystal structure belongs to the whitlockite family, with specific cation distribution elucidated.
    • This work expands the understanding of complex phosphate structures and cation behavior in these frameworks.