Giefers Hubertus, Tanis Elizabeth A, Rudin Sven P, Greeff Carl, Ke Xuezhi, Chen Changfeng, Nicol Malcolm F, Pravica Michael, Pravica Walter, Zhao Jiyong, Alatas Ahmet, Lerche Michael, Sturhahn Wolfgang, Alp Ercan
Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, USA.
Phys Rev Lett. 2007 Jun 15;98(24):245502. doi: 10.1103/PhysRevLett.98.245502. Epub 2007 Jun 14.
Determination of the lattice dynamics of Sn at high pressure has represented a major experimental challenge and eluded previous attempts. Here we report the first successful measurement of the phonon density of states of Sn at high pressure to 64 GPa using nuclear resonant inelastic x-ray scattering. We also present density functional theory calculations that are in excellent agreement with the measured data. The results of this combined experimental and theoretical study establish reliable phonon density of states of Sn at high pressure. It makes possible an accurate description of its thermodynamic properties that are of great importance and interest in high pressure research.
确定锡在高压下的晶格动力学一直是一项重大的实验挑战，此前的尝试均未成功。在此，我们报告首次利用核共振非弹性X射线散射成功测量了锡在高达64吉帕斯卡高压下的声子态密度。我们还给出了与测量数据高度吻合的密度泛函理论计算结果。这项结合了实验与理论的研究结果确定了锡在高压下可靠的声子态密度。这使得准确描述其热力学性质成为可能，而这些性质在高压研究中具有极其重要的意义和价值。
