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A high-entropy metal disilicide, (Mo0.2Nb0.2Ta0.2Ti0.2W0.2)Si2, has beensuccessfully synthesized. X-ray diffraction (XRD), energy dispersive X-rayspectroscopy (EDX), and electron backscatter diffraction (EBSD) collectivelyshow the formation of a single high-entropy silicide phase. This high-entropy(Mo0.2Nb0.2Ta0.2Ti0.2W0.2)Si2 possesses a hexagonal C40 crystal structure withABC stacking sequence and a point group of P6222. This discovery expands theknown families of high-entropy materials from metals, oxides, borides,carbides, and nitrides to a silicide, for the first time to our knowledge, aswell as demonstrating that a new, non-cubic, crystal structure (with lowersymmetry) can be made into high-entropy. This (Mo0.2Nb0.2Ta0.2Ti0.2W0.2)Si2exhibits high nanohardness of 16.7 +- 1.9 GPa and Vickers hardness of 11.6 +-0.5 GPa. Moreover, it has a low thermal conductivity of 6.9 +- 1.1 W m-1 K-1,which is approximately one order of magnitude lower than that of thewidely-used tetragonal MoSi2 and ~1/3 of those reported values for thehexagonal NbSi2 and TaSi2 with the same crystal structure.

A High-Entropy Silicide: (Mo0.2Nb0.2Ta0.2Ti0.2W0.2)Si2