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

使用单晶研究高压下地球材料压力引起的结构变化的晶格动力学。

基本信息

批准号：
14204053
负责人：
YAMANAKA Takamitsu
金额：
$ 32.45万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2004
项目状态：
已结题

项目摘要

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

为了研究地幔高温高压条件下的地球内部，高压下的晶格动力学研究与使用单晶的X射线衍射结构分析是互补的。通过后面的实验，可以从原子间距离、成键电子、有效电荷和电子态提供晶体结构信息。原子间力的形成可以通过晶格动力学分析来提供。本实验旨在通过激光拉曼光谱阐明晶体动态电荷随温度和压力的变化。(1)在这三年(2002-2004)的科学研究(A)的帮助下，本实验的第一阶段(2)在极端条件下完成了显微拉曼光谱仪的开发和测试。(2)为拉曼光谱研究而进行了新的晶格动力学实验系统 (3)为了理解地幔中MgSiO3多晶型物的相变，采用辉石-石榴石-钛铁矿-钙钛矿、三种合成钛铁矿MgSiO3、MgGeO3和MgTiO3来测量成分拉曼位移。 (4)利用安装有粉末样品和传输介质的金刚石砧压力盒(DAC)，将这三种钛铁矿的压力效应阐明为压力的函数。(5)为了了解地幔中水的存在，对水合硅酸盐矿物的拉曼光谱进行了动力学研究。通过研究氢键O-H…O的压力效应，讨论了压力诱导相变的体积模量、弹性特性和状态方程。(6)从固态电子的角度，利用同步辐射研究了压力对电子密度分布、晶格畸变和电荷转移的影响。地球内部的相位稳定性已通过拉曼光谱分析和上述 X 射线衍射研究进行了讨论。较少的