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"Amorphous Nickel Sulfide" Is Hydrated Nanocrystalline NiS with a Core-Shell Structure

Huang, Shanshan, Harris, Kenneth David Maclean, Lopez-Capel, E., Manning, D. A. C. and Rickard, David Terence 2009. "Amorphous Nickel Sulfide" Is Hydrated Nanocrystalline NiS with a Core-Shell Structure. Inorganic Chemistry 48 (24) , pp. 11486-11488. 10.1021/ic901512z

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Abstract

The application of a range of experimental techniques shows that “amorphous nickel sulfide” (the material precipitated from aqueous solutions of NiII salts and SII− under ambient conditions) is actually a hydrated nanoparticulate material with an approximate formula NiS·1.5H2O. The particles comprise a crystalline, anhydrous core (diameter ca. 1−3 nm) with the millerite (NiS) structure, surrounded by a hydrated shell phase. The materials prepared under acidic conditions (pH = 3 and 5) transform with age to form polydymite (Ni3S4) and heazlewoodite (Ni3S2), while materials prepared at pH = 7 and 9 do not undergo this transformation. At pH = 12, the preparation procedure yields NiAs-type NiS as a metastable phase.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QD Chemistry
Q Science > QE Geology
Publisher: American Chemical Society
ISSN: 1520-510X
Last Modified: 04 Jun 2017 02:09
URI: http://orca.cf.ac.uk/id/eprint/9864

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