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Crystal structure of meteoritic schreibersites: determination of absolute structure

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    0026608 - GLÚ 2006 RIV DE eng J - Journal Article
    Skála, Roman - Císařová, I.
    Crystal structure of meteoritic schreibersites: determination of absolute structure.
    [Krystalová struktura meteoritických schreibersitů: určení absolutní struktury.]
    Physics and Chemistry of Minerals. Roč. 31, č. 10 (2005), s. 721-732. ISSN 0342-1791. E-ISSN 1432-2021
    R&D Projects: GA ČR GA205/02/1101
    Institutional research plan: CEZ:AV0Z30130516
    Keywords : schreibersite * absolute structure * crystal structure
    Subject RIV: DB - Geology ; Mineralogy
    Impact factor: 1.336, year: 2005

    Minerals of the schreibersite-nickelphosphide series (Fe,Ni)3P crystallize in the non-centrosymmetric space group I-4. We present the crystal structure refinements from single crystal X-ray diffraction data for schreibersite grains from iron meteorites Acuna, Carlton, Hex River Mts., Odessa, Sikhote Alin, and Toluca aiming for the determination of the absolute structure of the examined crystals. Unit-cell parameter a and volume of the unit cell V, as well as certain topological structural parameters tightly correlate with Fe3P content. Unit-cell parameter c, on the other hand, does not show such strong correlation. Eight of the nine crystal structure refinements allowed unambiguous absolute structure assignment. Six of the eight unambiguous absolute structure determinations indicated inverted atomic arrangement compared to that reported in earlier structure refinements.

    Minerály řady schreibersit-niklfosfid (Fe,Ni)3P krystalují v necentrosymetrické prostorové grupě I-4. Pokusili jsme se určit absolutní strukturu z rtg. difrakčních dat pro zrna schreibersitu z meteoritů Acuna, Carlton, Hex River Mts., Odessa, Sikhote Alin, a Toluca. Osm z 9 krystalů umožnilo jednoznačné stanovení absolutní struktury a šest z těchto stanovení vykazuje inverzní uspořádání atomů ve srovnání s daty dříve uváděnými v literatuře.
    Permanent Link: http://hdl.handle.net/11104/0116832

     
     
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