Počet záznamů: 1

The system Fe-Nb-S and its geological implications

  1. 1.
    0356123 - FZU-D 2011 RIV CA eng J - Článek v odborném periodiku
    Drábek, M. - Hybler, Jiří - Rieder, M. - Böhmová, Vlasta
    The system Fe-Nb-S and its geological implications.
    Canadian Mineralogist. Roč. 48, č. 5 (2010), s. 1059-1068 ISSN 0008-4476
    Grant CEP: GA ČR GA205/08/0122
    Výzkumný záměr: CEZ:AV0Z10100521; CEZ:AV0Z30130516
    Klíčová slova: phase relations * edgarite * FexNbyS2 solid solution * Nb sulfides * system Fe-Nb-S * crystal-structure refinements
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 1.289, rok: 2010

    Phase relations within the system Fe–Nb–S were studied experimentally by the technique of evacuated silica glass tubes in the temperature interval 400–1000°C. The dominant field in the system is a broad solid-solution FexNbyyS22 (0 < x < 0.5, 1.0 < y < 1.4) that includes the composition of the mineral edgarite. Also, it forms stable assemblages with pyrrhotite and pyrite. The iron sulfides dissolve limited amounts of Nb: pyrrhotite dissolves up to 1.13 at.% Nb, and pyrite, only 0.02 at.% Nb. We refined the crystal structure of five samples of the FexNbyS2 solid solution, and established the relation between the unit-cell volume and Fe/(Fe + Nb). The occurrence of edgarite can be expected in associations with other sulfides crystallizing under extremely low fugacity of oxygen.
    Trvalý link: http://hdl.handle.net/11104/0194732