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Superconductivity and magnetism in iron sulfides intercalated by metal hydroxides.

ABSTRACT: Inspired by naturally occurring sulfide minerals, we present a new family of iron-based superconductors. A metastable form of FeS known as the mineral mackinawite forms two-dimensional sheets that can be readily intercalated by various cationic guest species. Under hydrothermal conditions using alkali metal hydroxides, we prepare three different cation and metal hydroxide-intercalated FeS phases including (Li_1-x Fe _x OH)FeS, [(Na_1-x Fe _x )(OH)₂]FeS, and K _x Fe_2-y S₂. Upon successful intercalation of the FeS layer, the superconducting critical temperature T_c of mackinawite is enhanced from 5 K to 8 K for the (Li_1-x Fe _x OH) ^?+ intercalate. Layered heterostructures of [(Na_1-x Fe _x )(OH)₂]FeS resemble the natural mineral tochilinite, which contains an iron square lattice interleaved with a hexagonal hydroxide lattice. Whilst heterostructured [(Na_1-x Fe _x )(OH)₂]FeS displays long-range magnetic ordering near 15 K, K _x Fe_2-y S₂ displays short range antiferromagnetism.

SUBMITTER: Zhou X

PROVIDER: S-EPMC5436553 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature

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Superconductivity and magnetism in iron sulfides intercalated by metal hydroxides.

Zhou Xiuquan X Eckberg Christopher C Wilfong Brandon B Liou Sz-Chian SC Vivanco Hector K HK Paglione Johnpierre J Rodriguez Efrain E EE

Chemical science 20170313 5

Inspired by naturally occurring sulfide minerals, we present a new family of iron-based superconductors. A metastable form of FeS known as the mineral mackinawite forms two-dimensional sheets that can be readily intercalated by various cationic guest species. Under hydrothermal conditions using alkali metal hydroxides, we prepare three different cation and metal hydroxide-intercalated FeS phases including (Li1-x Fe x OH)FeS, [(Na1-x Fe < ...[more]

PMID: 28580110

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Project description:A set of proteins that changed their levels of synthesis during growth of Acidithiobacillus ferrooxidans ATCC 19859 on metal sulfides, thiosulfate, elemental sulfur, and ferrous iron was characterized by using two-dimensional polyacrylamide gel electrophoresis. N-terminal amino acid sequencing and mass spectrometry analysis of these proteins allowed their identification and the localization of the corresponding genes in the available genomic sequence of A. ferrooxidans ATCC 23270. The genomic context around several of these genes suggests their involvement in the energetic metabolism of A. ferrooxidans. Two groups of proteins could be distinguished. The first consisted of proteins highly upregulated by growth on sulfur compounds (and downregulated by growth on ferrous iron): a 44-kDa outer membrane protein, an exported 21-kDa putative thiosulfate sulfur transferase protein, a 33-kDa putative thiosulfate/sulfate binding protein, a 45-kDa putative capsule polysaccharide export protein, and a putative 16-kDa protein of unknown function. The second group of proteins comprised those downregulated by growth on sulfur (and upregulated by growth on ferrous iron): rusticyanin, a cytochrome c(552), a putative phosphate binding protein (PstS), the small and large subunits of ribulose biphosphate carboxylase, and a 30-kDa putative CbbQ protein, among others. The results suggest in general a separation of the iron and sulfur utilization pathways. Rusticyanin, in addition to being highly expressed on ferrous iron, was also newly synthesized, as determined by metabolic labeling, although at lower levels, during growth on sulfur compounds and iron-free metal sulfides. During growth on metal sulfides containing iron, such as pyrite and chalcopyrite, both proteins upregulated on ferrous iron and those upregulated on sulfur compounds were synthesized, indicating that the two energy-generating pathways are induced simultaneously depending on the kind and concentration of oxidizable substrates available.

Dataset Information

Superconductivity and magnetism in iron sulfides intercalated by metal hydroxides.

Publications

Superconductivity and magnetism in iron sulfides intercalated by metal hydroxides.

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