High-entropy silicide superconductors with W5Si3-type structure

Bin Liu; Wuzhang Yang; Guorui Xiao; Qinqing Zhu; Shijie Song; Guang-Han Cao; Zhi Ren

doi:10.1103/PhysRevMaterials.7.014805

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High-entropy silicide superconductors with W5Si3-type structure

Bin Liu, Wuzhang Yang, Guorui Xiao, Qinqing Zhu, Shijie Song, Guang-Han Cao, Zhi Ren

DOI 10.1103/PhysRevMaterials.7.014805 · Physical Review Materials

T1

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Abstract

We report the synthesis, crystal structure, and physical properties of two new high-entropy silicides (HESs), namely (Nb0.1Mo0.3W0.3Re0.2Ru0.1)5Si3 and (Nb0.2Mo0.3W0.3Re0.1Ru0.1)5Si3. Structural analysis indicates that both HESs consist of a (nearly) single tetragonal W5Si3-type phase (space group I4/mcm) with a disordered cation distribution. Electrical resistivity, magnetic susceptibility, and specific heat measurements show that (Nb0.1Mo0.3W0.3Re0.2Ru0.1)5Si3 and (Nb0.2Mo0.3W0.3Re0.1Ru0.1)5Si3 are weakly coupled bulk superconductors, which represent the first superconducting high-entropy nonoxide ceramics. In particular, these HESs have higher Tc values (3.2–3.3 K) compared with those of the binary counterparts and their Bc2(0)/Tc ratios are the largest among superconductors of the same structural type.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(Nb0.1Mo0.3W0.3Re0.2Ru0.1)5Si3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.3	Pressure not reported	midpoint
(Nb0.1Mo0.3W0.3Re0.2Ru0.1)5Si3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.3	Pressure not reported	midpoint
(Nb0.1Mo0.3W0.3Re0.2Ru0.1)5Si3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.3	Pressure not reported	onset
(Nb0.2Mo0.3W0.3Re0.1Ru0.1)5Si3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.2	Pressure not reported	midpoint
(Nb0.2Mo0.3W0.3Re0.1Ru0.1)5Si3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3	Pressure not reported	midpoint
(Nb0.2Mo0.3W0.3Re0.1Ru0.1)5Si3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.2	Pressure not reported	onset
Nb5Si3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.7	Pressure not reported	unknown
W5Si3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.7	Pressure not reported	unknown