Mossbauer and Crystal Field Spectroscopy of Iron-Bearing Minerals at Ultrahigh Pressures

超高压下含铁矿物的穆斯堡尔和晶体场光谱

• 批准号: 9005228
• 负责人: Ho-kwang Mao
• 金额: $ 15万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-15 至 1992-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9005228&HistoricalAwards=false
• 关键词: Mossbauer; Crystal; Field; Spectroscopy; Iron

We propose to carry out a systematic spectroscopic study of the crystal chemistry of iron, including investigations of oxidation, reduction, disproportionation, and partitioning of iron in mantle and core materials at elevated pressures. The principal tools will be 57Fe Mossbauer and crystal-field spectroscopy, techniques that are ideally suited to studies of iron-bearing phases. The results will be correlated with vibrational spectra measured by Raman scattering and infrared absorption spectroscopy. The multi-anvil apparatus at SUNY Stony Brook, and diamond-anvil cell and piston-cylinder apparatus at the Geophysical Laboratory will be used for their complimentary pressure range and experimental conditions. Spectra will also be studied as a function of pressure in diamond-anvil cells. We shall map the P-T-fO2 conditions of the graphite/diamond buffer to lower mantle pressures with the piston-cylinder apparatus and the multi-anvil device and at ultrahigh pressure with the diamond-anvil cell. The results will be used to enlarge the existing thermodynamic database for iron-bearing mantle and core materials, which is crucial for modelling the mineralogy, chemical composition, and oxidation state of the deep interior.

我们建议进行系统的光谱研究， 铁的晶体化学，包括氧化的研究， 地幔中铁的还原、沉淀和分配 和核心材料的压力。 主要工具 将是57 Fe穆斯堡尔谱和晶体场光谱， 非常适合含铁矿物研究的技术 阶段。 结果将与振动光谱相关联 通过拉曼散射和红外吸收测量 谱 纽约州立大学斯托尼布鲁克的多砧装置，以及 金刚石砧座单元和活塞缸装置 地球物理实验室将用于其免费 压力范围和实验条件。 Spectra还将在 研究了金刚石压砧单元中压力的函数。 我们 应绘制石墨/金刚石缓冲器的P-T-fO 2条件 用活塞-气缸装置降低地幔压力， 多砧装置，并在压力下， 金刚石砧细胞 结果将用于放大 含铁地幔和核的现有热力学数据库 材料，这对矿物学建模至关重要， 化学成分和内部深处的氧化状态。