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射线衍射结构分析是互补的。通过后一种实验，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提供原子间力的形成信息。本实验的目的是用激光拉曼光谱研究晶体动态电荷随温度和压力的变化。(1)At在这三年（2002-2004）中，在科研（A）（2）的帮助下，进行了显微拉曼光谱仪的研制和极端条件下的测试。（2）建立了新的晶格动力学实验系统，为考虑晶体结构的拉曼光谱研究提供了实验依据。 ...更多信息 已经使用单晶实现了衍射各向异性。(3)In为了了解地幔中MgSiO_3多晶型物的相变过程，采用了三种人造钛铁矿（MgSiO_3、MgGeO_3和MgTiO_3）进行了考虑成分效应的拉曼频移测量。（4）利用金刚石对顶砧压力室（DAC），在压力室中装有粉末样品和传递介质，研究了三种钛铁矿的压力效应。（5）为了了解地幔中的水存在，对含水硅酸盐矿物的拉曼光谱进行了动力学研究。从氢键O-H…O的压力效应出发，讨论了压力诱导相变的体积模量、弹性性质和状态方程。（6）从固态电子的观点出发，利用同步辐射研究了电子密度分布的压力效应、晶格畸变和电荷转移，并结合拉曼光谱分析和上述X射线衍射研究讨论了地球内部的相稳定性。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