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X-ray Crystallography02:18

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High-resolution Single Particle Analysis from Electron Cryo-microscopy Images Using SPHIRE
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Rietveld refinement of Sr(5)(AsO(4))(3)Cl from high-resolution synchrotron data.

Anthony M T Bell, C Michael B Henderson, Richard F Wendlandt

    Acta Crystallographica. Section E, Structure Reports Online
    |May 18, 2011
    PubMed
    Summary

    Researchers synthesized penta-strontium tris-[arsenate(V)] chloride, a strontium apatite, using high-temperature ion exchange. This strontium chloride apatite crystallizes in the P6(3)/m space group, similar to other halogenoapatites.

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    Area of Science:

    • Solid-state chemistry
    • Crystallography
    • Materials science

    Background:

    • Apatite-type compounds are known for their diverse applications.
    • Halogenoapatites with the general formula A(5)(YO(4))(3)X are a well-studied class of materials.
    • Strontium-based apatites are of interest due to their unique properties.

    Purpose of the Study:

    • To synthesize and characterize the apatite-type compound penta-strontium tris-[arsenate(V)] chloride, Sr(5)(AsO(4))(3)Cl.
    • To determine the crystal structure of the synthesized compound.
    • To compare its structure with other known halogenoapatites.

    Main Methods:

    • High-temperature ion exchange reaction between a synthetic mimetite sample [Pb(5)(AsO(4))(3)Cl] and strontium carbonate (SrCO(3)).
    • High-resolution synchrotron X-ray powder diffraction (XRPD) for data collection.
    • Rietveld refinement for crystal structure determination.

    Main Results:

    • Successful synthesis of Sr(5)(AsO(4))(3)Cl with SrCO(3) as a by-product.
    • The compound crystallizes in the apatite structure type, space group P6(3)/m, consistent with other halogenoapatites.
    • Detailed structural analysis revealed two independent Sr(2+) cation sites and isolated tetrahedral AsO(4)(3-) anions, with chloride anions located in the structure's channels.

    Conclusions:

    • The synthesized strontium chloride apatite, Sr(5)(AsO(4))(3)Cl, adopts the characteristic apatite structure.
    • The crystal structure is analogous to other halogenoapatites, confirming the general formula A(5)(YO(4))(3)X.
    • The study provides a detailed crystallographic description of this strontium-based apatite compound.