Библиографическое описание:Formation of Layered Sulfide–Hydroxide (Valleriite) Materials under Hydrothermal Conditions : научное издание / R. V. Borisov [et al.]. - Текст : непосредственный // Inorganic Materials. - 2024. - Т. 60, № 9. - P. 1063-1073. - This work was supported by the Russian Science Foundation (project no. 22-13-00321, except for the SEM work, which was supported by the Ministry of Science and Higher Education of the Russian Federation (project FWES-2021–0014). - ISSN 0020-1685. - ISSN 1608-3172, DOI 10.1134/S0020168524701383.
Аннотация:This paper examines processes underlying the formation of layered materials, analogs of the natural mineral valleriite, CuFeS<sub>2</sub>·1.53[(Mg,Al)(OH)<sub>2</sub>], made up of alternating two-dimensional sulfide and hydroxide layers, under hydrothermal conditions. The synthesized materials have been characterized by X-ray diffraction, scanning and transmission electron microscopies, X-ray photoelectron spectroscopy, and laser diffraction. The results demonstrate that the formation of valleriite phase at 160°C in an autoclave proceeds through the formation and subsequent consumption of reaction intermediates: erdite (NaFeS<sub>2</sub>·2H<sub>2</sub>O), haycockite (Cu<sub>4</sub>Fe<sub>5</sub>S<sub>8</sub>), and chalcopyrite (CuFeS<sub>2</sub>). The formation of phase-pure valleriite has been shown to occur at a hydrothermal treatment time from 25 to 70 h, whereas shorter or longer treatment times lead to contamination of the reaction product with impurity phases. The nature of the anion in the starting materials (${\text{SO}}_{4}
Держатель оригинала документа:Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Siberian Federal University
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