Synthesis and Characterization of CrB2 by High Temperature and High Pressure Method
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摘要: 采用高温高压手段，以单质硼粉和铬粉为原料，在压力为6 GPa、温度为1 200 ℃的条件下成功制备出CrB2化合物。利用X射线衍射仪、X射线能谱仪、硬度检测仪和扫描电子显微镜，对合成产物进行了物性表征。结果表明：合成的CrB2固体为六方结构，空间群为P6/mmm，晶格常数a=0.297 nm，b=0.307 nm；合成样品的晶粒直径为5~40 μm，结晶质量良好。硬度测试结果显示，高温高压合成的CrB2具有很高的硬度。对比实验条件和实验结果发现，温度和原料配比均影响CrB2的合成，提高原料中硼的比例有助于目标产物CrB2的形成。Abstract: With the elemental boron powder and chromium powder as raw materials, CrB2 compound was prepared successfully at 6 GPa and 1 200 ℃ by using high temperature and high pressure method.X-ray diffraction (XRD), X-ray energy dispersive spectroscopy (EDS), hardness tester and scanning electron microscopy (SEM) were used to characterize the physical properties of the sample.The results show that the synthetic CrB2 is hexagonal structure with space group of P6/mmm, and the lattice constants a and b are 0.297 and 0.307 nm, respectively.From the SEM micrographs, it can be seen that the grain diameter ranges from 5 to 40 μm, and the crystalline quality is good.Moreover, the synthetic sample exhibits high hardness value.By comparing the experimental results obtained under different synthetic conditions, it is found that both the temperature and ratio of raw materials affect the synthesis of CrB2, and an increase in the proportion of boron in raw materials contributes to the formation of the desired product CrB2.
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Key words:
- high temperature and high pressure /
- CrB2 /
- X-ray diffraction /
- hardness
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图 3 不同原料配比下合成样品的XRD谱
Figure 3. XRD patterns of synthetic samples at different ratios of raw materials
图 4 不同温度下合成样品的XRD谱
Figure 4. XRD patterns of synthetic samples under different temperatures
图 5 0.1 N载荷下样品压痕的光学显微照片
Figure 5. Optical micrograph of the indentation made by a load of 0.1 N
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