Details

Autor(en) / Beteiligte

• Ge, Yufei
• Song, Hao
• Bao, Kuo
• Ma, Shuailing
• Li, Li
• Tao, Qiang
• Zhu, Pinwen
• Liu, Bo
• Duan, Defang
• Cui, Tian

Titel

A novel hard superconductor obtained in di-molybdenum carbide (Mo2C) with Mo–C octahedral structure

Ist Teil von

• Journal of alloys and compounds, 2021-11, Vol.881, p.160631, Article 160631

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals Complete

Beschreibungen/Notizen

• •Synthesis of polycrystalline Mo2C specimens has been carried out firstly under high pressure and high temperature.•Mo2C presents superconductivity below 7.5 K and the hardness is far higher than the traditional superconductive materials.•Covalent [Mo6C] octahedral unit related to good conductivity and high hardness.•Mo2C is a hard superconductor to bridging the gap between high hardness and superconductivity communities. [Display omitted] Hard superconducting materials are of particular interest for electromechanical applications under high strain and stress. In this work, Mo2C was synthesized using high temperature and high pressure (HPHT) methods. In view of characterizations, Mo2C transforms into a superconductivity state below the temperature of 7.5 K and the asymptotic Vickers hardness is about 13.4 GPa. Its hardness is compatible with that of commonly used hard alloys, which is a potential hard superconducting material. Based on the results of our first-principle calculations, superconductivity and hardness come from the high density of states at the Fermi energy level and high hardness originates from the strong hybridization between Mo-4d orbitals and C-2p orbitals. By introducing the light element C atoms into the transition metal Mo to form a ‘covalent metal’ structure, the hardness and mechanical properties of the superconducting material can be improved which gives a way to design hard superconducting materials.