Record details

Title
    Nickelphosphide from the Vicenice octahedrite: Rietveld crystal structure refinement of synthetic analogue
Statement of responsibility
    Roman Skála, Milan Drábek
Author
    Drábek, Milan, 1946-
    Skála, Roman
Language
    anglicky
Source title - serial
    Mineralogical magazine
Vol./nr.
    Vol. 67, no. 4
Pages
    p. 783-792
Year
    2003
Notes
    3 obr., 6 tab., 23 bibl.
    il.
    Zkr. název ser.: Mineral. Mag.
Subject group
    fosfidy
    krystalová struktura
    meteorit železný
    nikl
    oktaedrit
    syntéza minerálu
    zpřesňování struktury
    železo
Geographical name
    ČR-Morava
    Vícenice u Náměště nad Oslavou (Třebíč)
Keyword
    Analogue
    Crystal
    Nickelphosphide
    Octahedrite
    Refinement
    Rietveld
    Structure
    Synthetic
    Vicenice
Abstract (in english)
   The original description of nickelphosphide from the Butler meteorite [(Ni1.83Fe1.21)sigma3.04P0.96 to (Ni1.71Fe1.28Co0.01)sigma3.00P1.00] lacks detailed and accurate powder data - with only 11 observed reflections down to 1.37 angstrom. Consequently, no crystal structure information for this phase is available. Here we present the crystal structure for a synthetic analogue of the phase found in the Vicenice IID medium octahedrite (with a mean empirical formula of (Ni1.69Fe1.31)sigma3.00P1.00) and a hypothetical Ni3P end-member. Unit-cell dimensions of the synthetic analogue of Ni1.68Fe1.33P0.99 composition from individual peak profile fitting of XRD data collected with Cu radiation are a = 9.0168(2) angstrom, c = 4.4491(1) angstrom, V= 361.72(1) angstrom3 and those for Ni3P composition are a = 8.9546(1) angstrom, c = 4.38714(8) angstrom, V = 351.783(8) angstrom3. The space group of the mineral is I-4 and Z = 8.
   The crystal structure refined from powder data by the Rietveld method is consistent with that refined and published for Fe3P and Ni3P synthetic compounds as well as Fe-dominant schreibersite from single-crystal data. However, because of the similarity of the scattering of iron and nickel, we were not able to refine directly the site occupancies in the synthetic analogue of the nickelphosphide from the Vicenice iron meteorite
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    16. 8. 2007
Import date
    8. 8. 2012