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Crystal Research and Technology |
Cryst. Res. Technol. 40,
52 (2005) - Abstract -
Investigations of the meteoritic mineral (Fe,Ni)3P
V. Geist, G. Wagner, G. Nolze* and O. Moretzki
Institute for Mineralogy, Crystallography and Materials Science, University Leipzig, Scharnhorststr.20, 04275 Leipzig, Germany
*Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany
| Keywords | iron meteorites, schreibersite, rhabdite, carlsbergite, structure determination, metal ordering, EBSD, TEM, synchrotron radiation |
| PACS | 96.50.Mt, 81.05Bx, 61.66.Dk, 61.66 Fn, 81.30.Mh |
| DOI | 10.1002/crat.200410307 |
A survey is presented on some characteristic features of meteoritic (Fe,Ni)3Pwhich is an abundant and important minor phase of most iron meteorites. This mineral (named schreibersite/rhabdite) plays a decisive role during the formation of the so-called Widmanstätten pattern. Different transmission as well as scanning electron microscopic techniques have been applied to get more precise information about the real structure of the phosphide crystals, their chemical composition and the metal distribution across the phoshide/ kamacite interface. X-ray crystal structure determinations have been performed for selected (Fe,Ni)3P - cystals from various iron meteorites (Toluca, North Chile, Watson, Orange River, Morasko, Agpalilik, Odessa, Canyon Diablo). These experiments revealed a metal ordering, i.e. for the three non-equivalent metal positions a different substitution of Fe by Ni has been found. The perfection of the brittle (Fe,Ni)3P samples differs appreciably and seems to be dependent on the thermal history of each individual meteorite. Moreover, inside Ni-rich rhabdite crystals small monocrystalline inclusions of CrN (carlsbergite) have been detected.
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