Point Defects and Transport Properties of a Lower Mantle Phase (Mg,Fe)O: The Role of Hydrogen and Ferric Iron

下地幔相 (Mg,Fe)O 的点缺陷和输运特性：氢和三价铁的作用

• 批准号: 0809330
• 负责人: Shun-ichiro Karato
• 金额: $ 46.98万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2013-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0809330&HistoricalAwards=false
• 关键词: Point; Defects; Transport; Properties; Lower

In this project, the PI will investigate the nature of point defects and related transport properties in (Mg,Fe)O such as diffusion and electrical conductivity. (Mg,Fe)O is one of the major minerals in the Earth's lower mantle and these properties are key to the understanding of the dynamics of the lower mantle. A particularly important issue is the role of oxidation state and of hydrogen in controlling these properties. A review of existing literature suggests that the role of hydrogen in controlling these properties in (Mg,Fe)O is likely very different and pressure dependent. Through a systematic study of point defect-related properties, the PI and his team will obtain the first data set to understand the transport properties of the largest part of Earth's mantle.

在这个项目中，PI将研究（Mg，Fe）O中的点缺陷的性质和相关的输运性质，如扩散和导电性。(Mg（Fe）O是地球下地幔中的主要矿物之一，这些性质是了解下地幔动力学的关键。一个特别重要的问题是氧化态和氢在控制这些性质中的作用。现有文献的回顾表明，氢在控制（Mg，Fe）O中的这些性质中的作用可能是非常不同的和压力相关的。通过对点缺陷相关属性的系统研究，PI和他的团队将获得第一个数据集，以了解地球地幔最大部分的传输属性。