Experimental Measurements of Grain-Boundary Diffusivities in Mantle Silicates

地幔硅酸盐晶界扩散系数的实验测量

• 批准号: 9315343
• 负责人: Stephen Mackwell
• 金额: $ 15万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-04-01 至 1997-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9315343&HistoricalAwards=false
• 关键词: Experimental; Measurements; Grain; Boundary; Diffusivities

9315343 Graham This project will determine grain boundary diffusivities in enstatite, olivine, and diopside polycrystals as a function of temperature, oxygen fugacity (using CO/CO2 mixtures), and iron (and calcium in diopside) content. The effects of water (and hydrogen) fugacity on grain boundary diffusivity will be investigated by performing experiments using H2/H2O gas mixtures to control the oxygen fugacity. The research will elucidate the role of grain boundaries as conduits for ionic and electronic transport, which are important phenomena in both geosciences and materials sciences.

9315343 Graham该项目将确定顽火辉石、橄榄石和透辉石多晶体中的晶界扩散系数，作为温度、氧逸度（使用CO/CO2混合物）和铁（透辉石中的钙）含量的函数。 水（和氢）逸度对晶界扩散率的影响将通过使用H2/H2O气体混合物来控制氧逸度进行实验来研究。 这项研究将阐明晶界作为离子和电子传输管道的作用，这是地球科学和材料科学中的重要现象。