Lattice dynamics study of pressure-induced structure change of earth materials under high pressure using single crystals.

对于地幔高温高压条件下的地球内部研究，高压下的晶格动力学研究与单晶X射线结构分析是相辅相成的。通过后面的实验，可以从原子间距、成键电子、有效电荷和电子态等方面提供晶体结构信息。晶格动力学分析可以为原子间作用力的形成提供依据。本实验旨在通过激光拉曼光谱来阐明晶体动态电荷随温度和压力的变化。(1)在本实验的第一阶段(2002年至2004年)，在科学研究(A)的帮助下，(2)在极端条件下进行了显微拉曼光谱仪的研制和测试。(2)为了进行考虑CRY…的拉曼光谱研究，建立了新的晶格动力学实验系统(3)为了了解不同晶型的MgSiO_3在地幔中的相变，采用了三种合成的钛铁矿：MgSiO_3、MgGeO_3和MgTiO_3，测量了它们的拉曼位移和成分效应。(4)利用装有粉末样品和传输介质的金刚石顶压室(DAC)，阐明了这三种钛铁矿的压力效应是压力的函数。(5)为了了解地幔中水的存在，进行了水合硅酸盐矿物的拉曼光谱动力学研究。氢键O-H…压力效应的研究讨论了压致相变的O、体弹性、弹性性质和状态方程。(6)从固体电子的角度出发，利用同步辐射研究了电子密度分布、晶格畸变和电荷转移的压强效应。从拉曼光谱分析和上述X射线衍射研究中讨论了地球内部的相稳定性。较少

For the investigation of earth interiors under high-temperature and high-pressure condition of the mantle, lattice dynamical studies under high pressures are complementary with X-ray diffraction structure analyses using single crystals. By means of the latter experiments, the crystal structure information can be provided from the interatomic distances, bonding electron, effective charge and electronic state. In formation of interatomic force can be provided from lattice dynamical analysis. The present experiment aims to elucidate crystal dynamical charge as functions of temperature and pressure by means of laser Raman spectroscopy.(1)At the first stage of this experiment during these three years(2002-2004) with the aid of the Scientific Research (A)(2)development and test of the microscopic Raman spectrometer have been made under extreme conditions.(2)The new lattice dynamical experimental system has been performed for the purpose that Raman spectral studies taking into account the cry … More stallographic anisotropy have been executed using single crystal.(3)In order to comprehend the phase transformation of MgSiO3 polymorphs in mantle, pyroxene-garnet-ilmenite-perovskite, three synthetic ilmenites, MgSiO3 MgGeO3and MgTiO3, are applied for the measuring Raman shift with compositional effect.(4)Pressure effect of these three ilmenites has been clarified as a function of pressure using diamond anvil pressure cell (DAC), in which powder sample and transmitting media are installed.(5)For the purpose of understanding the water presence in the mantle, kinetic studies of Raman spectra of hydrous silicate minerals have been conducted. From the investigation of pressure effect of hydrogen bond O-H…O, bulk modulus, elastic properties and equation of state have been discussed for pressure-induced transformation.(6)Pressure effect of the electron density distribution, lattice distortion and charge transfer were investigated using synchrotron radiation from the viewpoint of solid-state electron. Phase stability of earth's interiors has been discussed from the Raman spectroscopic analyses together with the above-mentioned X-ray diffraction studies. Less