Record details

Title
    The crystal structure of Co2P from X-ray powder diffraction data and its mineralogical applications
Statement of responsibility
    Roman Skála, Milan Drábek
Author
    Drábek, Milan
    Skála, Roman
Language
    anglicky
Source title - serial
    Věstník Českého geologického ústavu (Bulletin of the Czech Geological Survey)
Vol./nr.
    Vol. 76, no. 4
Pages
    p. 209-216
Year
    2001
Notes
    6 obr., 6 tab., 35 bibl.
    il.
    Zkr. název ser.: Věst. Čes. geol. Úst. (Bull. Czech geol. Surv.)
Subject group
    fosfidy
    kobalt
    krystalochemie
    krystalová struktura
    meteority
    metoda prášková
    mřížka krystalová
    nikl
    železo
Keyword
    Applications
    Co2P
    Crystal
    Data
    Diffraction
    Mineralogical
    Powder
    Structure
    X-ray
Abstract (in english)
   The structure of stoichiometric Co2P was solved ab initio from powder diffraction data. We found the Co2P phase to be orthorhombic, space group Pnma. Unit-cell dimesions refined from powder data are a = 5.6479(4), b = 3.5129(2) A, c = 6.6078(4) A, V = 131.10(1) A3, number of formula units in the unit cell Z = 4. All atoms within the structure are located in 4c sites. prosphorus in nine-coordinated and cobalt atoms are fou and five-coordinated. Structure motifs found in Co2P are very different from those in member of Fe3P - Ni3P solid solution, which may explain the limited miscibility of the title compound in phosphide phases of the schreibersite-nickelphosphide series. Contrary to that, the similarities between the crystal structures of Co2P and members of the Fe2P-Ni2P solid solution invite the interpretation that relatively higher concentrations of Co could be accomodated in barringerite-type phases in meteorites.
   A complete mutual miscibility can be expected between Co2P and florenskyite (FeTiP)-like phases, which are isotypic
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    29. 1. 2008
Import date
    8. 8. 2012