Revealing the Unusual Boron-Pinned Layered Substructure in Superconducting Hard Molybdenum Semiboride

Improving the poor electrical conductivity of hard materials is important, as it will benefit their application. High-hardness metallic Mo2B was synthesized by high-pressure and high-temperature methods. Temperature-dependent resistivity measurements suggested that Mo2B has excellent metallic conduc...

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Veröffentlicht in:ACS omega 2021-08, Vol.6 (33), p.21436-21443
Hauptverfasser: Ge, Yufei, Bao, Kuo, Ma, Teng, Zhang, Jinmeng, Zhou, Chao, Ma, Shuailing, Tao, Qiang, Zhu, Pinwen, Cui, Tian
Format: Artikel
Sprache:eng
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Zusammenfassung:Improving the poor electrical conductivity of hard materials is important, as it will benefit their application. High-hardness metallic Mo2B was synthesized by high-pressure and high-temperature methods. Temperature-dependent resistivity measurements suggested that Mo2B has excellent metallic conductivity properties and is a weakly coupled superconductor with a T c of 6.0 K. The Vickers hardness of the metal-rich molybdenum semiboride reaches 16.5 GPa, exceeding the hardness of MoB and MoB2. The results showed that a proper boron concentration can improve the mechanical properties, not necessarily a high boron concentration. First-principles calculations revealed that the pinning effect of light elements is related to hardness. The high hardness of boron-pinned layered Mo2B demonstrated that the design of high-hardness conductive materials should be based on the structure formed by light elements rather than high-concentration light elements.
ISSN:2470-1343
2470-1343
DOI:10.1021/acsomega.1c02262