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摘要: 采用原位高压同步辐射能散X射线衍射和金刚石压砧技术,实验研究了新型超硬材料六角相B0.47C0.23N0.30的高压相变及物理特性,压力范围为1.4~30 GPa。实验结果表明,六角相B0.47C0.23N0.30在14.9 GPa压力下发生了相变,形成的新相为六方纤锌矿结构。计算得到了具有六方纤锌矿结构的B0.47C0.23N0.30的晶格常数、晶胞体积随压力的变化关系,并与六角相B0.47C0.23N0.30进行了对比分析。根据布里奇曼方程,计算得到了具有六方纤锌矿结构的B0.47C0.23N0.30的体模量K0=(27526)GPa,非常接近立方相BC2N的体模量(28215)GPa。Abstract: Using in situ high-pressure synchrotron X-ray diffraction and diamond anvil cell (DAC) techniques, the phase transition and physical characteristics of B0.47C0.23N0.30 compound were observed in the pressure range of 1.4~30 GPa. The experimental results showed that the B-C-N compound experiences a phase transition from hexagonal structure to wurtzite phase at 14.9 GPa. The pressure dependences of the lattice parameters and volume of wurtzite-type B-C-N were calculated. By fitting the Brich-Murnaghan equation of state to the pressure-volume data, the bulk modulus of wurtzite-type B-C-N compound was obtained as (27526)GPa, which is very close to the value of (28215)GPa for the cubic BC2N.
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Key words:
- high pressure /
- phase transition /
- compressibility
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