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首页> 外文期刊>Physica status solidi, B. Basic research >First-principles calculation of vibrational properties of B_(12)As_2 crystal
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First-principles calculation of vibrational properties of B_(12)As_2 crystal

机译:B_(12)As_2晶体振动特性的第一性原理计算

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We use density functional perturbation theory (DFPT) to simulate the 26 vibrational modes of B_(12)As_2 crystal at the G point. All the 12 Raman-active modes are in good agreement with experimental Raman spectra of B_(12)As_2. We explain several controversial modes of the past, such as the predicted Raman-active mode with a low frequency and the Ramanactive mode at 503 cm~(-1).We also plot the dispersion curves of B_(12)As_2 from Brillouin zone center to Z (0.5, 0.5, 0.5) and to A (0.5, 0.0, 0.0). We determine the acoustic branch speeds to be in the range 9850–10 980 m/s for LA and 6940–7220 m/s for TA modes. Finally, we give the predicted physical properties, including the phonon entropy, the phonon heat capacity, elastic constants, and bulk modulus.
机译:我们使用密度泛函摄动理论(DFPT)来模拟B_(12)As_2晶体在G点的26种振动模式。 12种拉曼活性模式与B_(12)As_2的拉曼光谱实验结果吻合良好。我们解释了过去的几种有争议的模式,例如低频率的预测拉曼激活模式和503 cm〜(-1)处的拉曼激活模式。我们还绘制了布里渊区中心的B_(12)As_2色散曲线Z(0.5,0.5,0.5)和A(0.5,0.0,0.0)。对于LA模式,我们确定声学分支速度在9850–10 980 m / s范围内,对于TA模式,我们将其确定为6940–7220 m / s。最后,我们给出了预测的物理性质,包括声子熵,声子热容,弹性常数和体积模量。

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