Characterization of high pressure and natural samples by Raman spectroscopy

通过拉曼光谱表征高压和天然样品

• 批准号: 12440150
• 负责人: WALTER Michael
• 金额: $ 9.54万
• 依托单位: OKAYAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12440150/
• 关键词: Raman spectroscopy; diamond anvil cell; mineral inclusions; in situ mineral analysis

In the proposal period we purchased and installed the equipment needed for a micro-Raman spectroscopy system, as well as the Type II diamonds needed for in situ spectroscopy in the diamond anvil cell. The installed Raman microprobe system was designed specifically to meet the needs of our high-pressure materials research group, and for the investigation of Earth and solar system materials. The installed system has achieved a very high performance, with a spectral resolution of about 0.5 nm and high optical throughput. This system is now used routinely in our lab for identification of phases synthesized in high-pressure experiments and to investigate natural minerals. In the proposal period we have used micro-Raman to identify many synthetic and natural silicate and oxide phases and have built a file to use as reference standards. We have also used the micron-Raman system to positively identify the existence of a high-pressure polymorph of SiO_2, coesite, in eclogite xenoliths from the Colorado plateau, the first reported for eclogites of this region. We have used the system to investigate the effect on melt speciation and polymerization of adding sulfur to sodium silicate melts, and are continuing investigations into melt speciation in depolymerized silicate systems. The micro-Raman system is also used routinely in our lab to measure pressure in situ in the diamond anvil cell using Ruby fluorescence. We are continuing to be engaged in projects in which Raman microscopy plays an important role.

在提案期间，我们购买并安装了微拉曼光谱系统所需的设备，以及金刚石砧池中原位光谱所需的II型钻石。安装的拉曼微探针系统是专门为满足我们高压材料研究组的需求而设计的，用于研究地球和太阳系的材料。所安装的系统达到了非常高的性能，光谱分辨率约为0.5 nm，光学吞吐量高。该系统目前在我们的实验室常规使用，用于鉴定高压实验合成的相和研究天然矿物。在建议期内，我们用微拉曼技术鉴定了许多合成的和天然的硅酸盐和氧化物相，并建立了一个文件作为参考标准。我们还利用微米拉曼系统确定了科罗拉多高原榴辉岩包体中SiO_2高压多晶的存在，这是该地区首次报道的榴辉岩。我们已经使用该系统研究了在硅酸钠熔体中添加硫对熔体形态和聚合的影响，并正在继续研究解聚硅酸盐体系中的熔体形态。微拉曼系统也在我们的实验室常规使用红宝石荧光测量金刚石砧细胞中的原位压力。我们正在继续从事拉曼显微镜发挥重要作用的项目。