Chemical vapour transport of pyrite (FeS2) with halogen (Cl, Br, I)

S. Fiechter, J. Mai, A. Ennaoui, W. Szacki

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A systematic study of chemical vapour transport (CVT) of pyrite with halogen, hydrogen halides and ammonium halides as transporting agents has shown that the transport with chlorine and bromine in a temperature gradient ΔT = 920-820 K yields the highest transport rates (∼6 mg/h) with crystals up to 5 mm edge length. Computing thermochemical equilibria and flux functions in the system Fe-S-Hal (Hal = Cl, Br, I) it has been confirmed that the transport velocity of pyrite is limited by the concentration of FeHal2 in the vapour phase, the equilibrium position between FeHal2(g) and FeHal3(g) and the flux directions of the iron gas species.

Original languageEnglish
Pages (from-to)438-444
Number of pages7
JournalJournal of Crystal Growth
Issue number3
Publication statusPublished - 1 Dec 1986
Externally publishedYes


ASJC Scopus subject areas

  • Condensed Matter Physics

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