Growth, Structure, Electrical Transport and Thermal Stability of New Allotropic MoC 4 Crystals

作者：Lin Cao, Haomin Lu, Shuang Han, Jiang-He Feng, Yang‐Yang Lv, Jian Zhou, Shu‐Hua Yao, Y. B. Chen, Yan‐Feng Chen, Yan-Feng Chen, Yan-Feng Chen · 发表于：Crystal Growth & Design · 年份：2021 · DOI：10.1021/acs.cgd.1c00320 · 被引用次数：4 · 研究领域：MXene and MAX Phase Materials、Metal and Thin Film Mechanics、Boron and Carbon Nanomaterials Research

Carbide materials are interesting and useful functional materials, such as for thermal barrier coatings and wide-band-gap semiconductors. In this paper, a novel molybdenum carbide material, MoC 4 crystals, was obtained using the chemical vapor transport (CVT) method. MoC 4 crystals have a monoclinic structure, and their space group is P 2 1 / n (No. 14) ( a = 5.5347(14) Å, b = 4.8498(7) Å, c = 5.6013(14) Å, and V = 130.91(6) Å 3 ). The electrical properties of MoC 4 crystal demonstrate the metallic behavior that the Bloch–Grüneisen model can well describe. A Hall measurement shows that MoC 4 has a high hole carrier concentration of up to 0.6 × 10 23 cm –3 on average and carrier mobility of μ = 76–125 cm 2 V –1 s –1 . In addition, MoC 4 was found to be thermodynamically stable above 1500 °C, and so it may be used as high-temperature conductors or electrodes.