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Nanoparticle assembly leads to mackinawite formation

DOI: 10.1021/acs.cgd.8b01025 DOI Help

Authors: Adriana Matamoros-veloza (University of Leeds) , Tomasz M. Stawski (University of Leeds; German Research Centre for Geosciences) , Liane G. Benning (University of Leeds; German Research Centre for Geosciences; Free University of Berlin)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Crystal Growth & Design

State: Published (Approved)
Published: September 2018
Diamond Proposal Number(s): 8973

Abstract: Iron sufides are important mineral phases in natural environments where they control global elemental cycles. Fe-S phases have been suggested to form through transformation of several possible precursors to finally reach stable crystalline structures. Mackinawite is a metastable intermediate, of which a full chemical and structural characteristisation of various possible intermediate stages in its formation pathways, or the chemical conditions that affect the transformations to the metastable mackinawite are well understood. Here we report, the various steps of mackinawite formation via oriented aggregation (OA) from a nanoparticulate precursor. During OA, the formation of aggregates is a crucial stage for self-assembly of primary particles to reach stable structures. The formation occurs in five steps: (1) homogeneous nucleation of primary FeSnano particles, (2 and 3) formation of mass fractal-like aggregates from the FeSnano as precursor towards the transformation to mackinawite; (4) oriented alignment and self-assembly of these mackinawite-like aggregates, and (5) transformation to a still metastable but typical layered mackinawite structure.

Subject Areas: Chemistry, Earth Science


Instruments: I22-Small angle scattering & Diffraction