Synthesis of Hard Superconductive Ternary Transition Metal Carbide under High Pressure and High Temperature
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摘要: 采用高温高压合成手段，以纯度均在99.8%以上的钼粉、钨粉和石墨粉作为合成原料，在压强5.0GPa、温度2000K、保温时间60min的条件下成功制备出MoWC2样品。利用X射线衍射仪、扫描电子显微镜、透射电子显微镜、显微硬度仪、综合物性测量系统和热重-差热分析仪对合成样品进行了物性表征。结果表明：合成的MoWC2晶体为六角结构，其空间群为P6-m2；晶粒大小为1~4μm，结晶质量良好；MoWC2的收敛硬度值为15.3GPa；氧化温度为450℃；温度低于6.8K时体现超导电性。MoWC2的轨道杂化很强，因而具有较高的硬度和抗氧化性。同时，MoWC2费米面处态密度和德拜温度较高，使其成为一种超导材料。由此可知，MoWC2是一种兼具超导性、耐热性和较高硬度的硬质超导多功能材料。Abstract: In the present work MoWC2 was successfully fabricated under 5.0GPa/2000K with a holding time of 60min using, as the synthetic raw material, molybdenum, tungsten and graphite powder (whose purity are more than 99.8%).Then the physical properties of the synthesized samples were characterized using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, micro-hardness test, physical property measurement system and thermo gravimetric-differential thermal analyzer (TG-DTA).The results show that the MoWC2 crystal thus synthesized has a hexagonal structure with a space group of P6-m2.It is highly crystalline with an average grain size of 1-4μm.Its convergence hardness value, oxidation temperature and the superconducting temperature are 15.3GPa, 450℃ and 6.8K, respectively.In addition, this MoWC2 has a high hardness and oxidation resistance owing to its strong orbital hybridization.Furthermore, it is a superconducting material with a relatively high transition temperature since it has a higher density of states at the Fermi surface and Debye temperature, thereby making it a versatile material that is superconductive, highly heat-resistant, and superhard.
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图 5 4.9N载荷下MoWC2样品压痕的光学显微照片
Figure 5. Optical micrograph of MoWC2 sample's indentation under load of 4.9N
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