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Physics and Chemistry of Minerals

, Volume 31, Issue 10, pp 721–732 | Cite as

Crystal structure of meteoritic schreibersites: determination of absolute structure

  • Roman Skála
  • Ivana Císařová
Original papers

Abstract

Minerals of the schreibersite–nickelphosphide series (Fe,Ni)3P crystallize in the non-centrosymmetric space group \(I\bar 4\). As a consequence, they can possess two different spatial arrangements of the constituting atoms within the unit cell, related by the inversion symmetry operation. Here, we present the crystal structure refinements from single crystal X-ray diffraction data for schreibersite grains from iron meteorites Acuña, Carlton, Hex River Mts. (three different crystals), Odessa (two different crystals), Sikhote Alin, and Toluca aiming for the determination of the absolute structure of the examined crystals. The crystals studied cover the composition range from ~58 mol% to ~80 mol% Fe3P end-member. 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. The single crystal extracted from Toluca is, however, of poor quality and consequently the structure refinement did not provide as good results as the rest of the materials. Also, this crystal has only weak inversion distinguishing power to provide unequivocal absolute structure determination. Six of the eight unambiguous absolute structure determinations indicated inverted atomic arrangement compared to that reported in earlier structure refinements (here called standard). Only two grains, one taken from Odessa iron and the other from the Hex River Mts. meteorite, reveal the dominance of standard crystal structure setting.

Keywords

Schreibersite Absolute structure Crystal structure X-ray diffraction Iron meteorites 

Notes

Acknowledgements

The research has been supported by the grants of the Science Foundation of the Czech Republic (GAČR) No. 205/98/0655 and No. 205/02/1101. We are also grateful to Marcela Bukovanská of the Natural History Museum of the National Museum in Prague, Gero Kurat of Naturhistorisches Museum in Vienna and Yevgeny Plyaskov of Prague who provided material for single-crystal structure study. Václav Petříček of the Institute of Physics, Czech Academy of Science, Prague, kindly carried out transformations of intensity files to correspond to the invariant choice of the coordinate system.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Inst. GeologyAcademy of Science of the Czech RepublicPraha 6Czech Republic
  2. 2.Department of Inorganic Chemistry, Faculty of ScienceCharles UniversityPraha 2Czech Republic
  3. 3.Bayerisches GeoinstitutUniversität BayreuthBayreuthGermany

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