Abstract
Millerite (β-NiS) has been examinedby transmission electron microscopy and found to lose sulfur on beam heating. The product of this sulfur loss is α-Ni7S6 which undergoes a series of reversible polymorphic transformations on cooling. These involve the formation of superstructures based on the high temperature body-centered structure.
Low temperature β-Ni7S6 forms on rapid cooling of α-Ni7S6 and is invariably poly-synthetically twinned normal to the (011) plane.
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