Elasticity of cubic boron nitride under ambient conditions
Elasticity of cubic boron nitride under ambient conditions
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DOI：
10.1063/1.3561496
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发表时间：
2010-12
影响因子：
3.2
通讯作者：
Jin S. Zhang;J. Bass;T. Taniguchi;A. Goncharov;Y. Chang;S. Jacobsen
中科院分区：
文献类型：
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作者：
Jin S. Zhang;J. Bass;T. Taniguchi;A. Goncharov;Y. Chang;S. Jacobsen
立方氮化硼（cBN）是一种化学惰性与金刚石相似的超硬材料，利用其压力-体积-温度（P-V-T）状态方程，可以作为高温高压研究的压力校准标准材料。然而，文献中报道的cBN在环境条件下的弹性性能变化高达8%，这可能部分归因于cBN成分、缺陷结构和测量不确定性的变化。通过布里渊散射测量，我们高精度地测量了高纯度cBN的单晶弹性模量，力求将实验不确定性降到最低。得到C11 = 798.4±1.7 GPa, C44 = 469.0±1.0 GPa, C12 = 172.4±1.1 GPa，由此计算出各向同性骨料体积模量Ks = 381.1±1.3 GPa，剪切模量G = 398.8±1.2 GPa （Hill平均值）。我们的结果提高了精度，减少了弹性模态的不确定性。
As a superhard material with properties similar to diamond including chemical inertness, cubic boron nitride (cBN) is an excellent candidate as a pressure calibration standard for high-temperature high-pressure research using its pressure-volume-temperature (P-V-T) equation of state. However, the elastic properties of cBN at ambient conditions reported in the literature vary by up to 8%, which can likely be attributed in part to variability in the cBN composition and defect structure and measurement uncertainties. We have measured the single-crystal elastic moduli of high-purity cBN with high precision by Brillouin scattering measurements, making an effort to minimize experimental uncertainties. We obtain values of C11 = 798.4 ± 1.7 GPa, C44 = 469.0 ± 1.0 GPa, and C12 = 172.4 ± 1.1 GPa, from which the isotropic aggregate bulk modulus Ks = 381.1 ± 1.3 GPa and shear modulus G = 398.8 ± 1.2 GPa (the Hill average) were calculated. Our results improve the precision and reduce the uncertainties in the elastic m...