Ultrahigh-Pressure Earth Science : Study of Lowermost mantle and core materials

我们首先成功地产生了静态超高压和温度条件。我们还开发了新的实验方法来确定高压和高温下的电导率和热导率以及元素分配。利用这些技术，我们确定了深部下地幔的性质以及在核心压力和温度下Fe和FeO的相关系。这些结果阐明了地幔深部熔体与固体的密度交叉、日长在年代际尺度上变化的原因、外核可能的分层以及内核物质的晶体结构。

We first succeeded in generating static ultrahigh-pressure and-temperature conditions. We also developed new experimental methods to determine electrical and thermal conductivity and element partitioning at high pressure and temperature. With such techniques, we determined properties of the deep lower mantle and the phase relations in Fe and FeO at core pressures and temperatures. These results clarified the density crossover between melt and solid in the deep mantle, the cause of change in length of a day in decadal timescales, possible stratification in the outer core, and the crystal structure of inner core material.