Intercalation‐assisted massive phase transformation: The key to SHS synthesis?

Abstract

AbstractSelf‐propagating high‐temperature synthesis (SHS) is the term used for a spontaneous, irreversible combustion of initial reagents when ignited. There is limited knowledge of the mechanistics of this versatile materials synthesis process for Chevrel phase compounds (CPCs), which limits its applicability. In this report, the successful and rapid processing of three classes of sulfide CPCs via SHS is demonstrated, and a mechanism is provided to explain rapid transformation rates and nanostructured products that are fully transformed. Cu4Mo6S8, Ni2Mo6S8, and Fe2Mo6S8 compounds were synthesized, and thermochemical measurements revealed that an overall reaction temperature did not surpass the melting points of the reactants. The nature of the specific SHS process is argued here to involve an intercalation‐assisted massive phase transformation facilitated by the use of an MoS2 precursor.