Synthesis and structure of valleriite, a layered metal hydroxide/sulfide composite

Anthony E. Hughes, Gary A. Kakos, Terence W. Turney, Timothy B. Williams

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Optimum conditions have been determined for the hydrothermal synthesis of valleriite from mixtures of Fe/Cu sulfide and Mg/Al hydroxide gels. X-ray diffraction, electron microscopy, and X-ray photoelectron spectroscopy studies confirm a structure consisting of alternating brucite-like (Mg, Al) hydroxide layers and Cu-Fe-S sulfide layers. Energy-dispersive X-ray analysis of good quality crystals prepared from different starting ratios indicate that valleriite is stable within the composition range [CuFeS2] · 1.67[Mg0.70Al0.30(OH)2] to [Cu1.30Fe0.70S2] · 1.35[Mg0.74Al0.26(OH)2]. A combination of XPS and EDX suggests that valleriite contains Cu+ and mainly Fe3+ cations.

Original languageEnglish
Pages (from-to)422-436
Number of pages15
JournalJournal of Solid State Chemistry
Issue number2
Publication statusPublished - 1 Jan 1993
Externally publishedYes

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