Experimental Determination of the Thermal Equations of State of Mantle and Core Materials

9974373亨氏在同步加速器、金刚石顶锤设计和激光加热技术方面的最新进展为在高压和高温下研究矿物开辟了新的机会之窗。采用激光加热和同步辐射相结合的方法，在下地幔和最外层地核的压力和温度条件下，测量了钙钛矿结构的(Mg，Fe)SiO_3、(Mg，Fe)O、SiO_2、Fe、Ni和FeS的热状态方程。这些测量将限制这些材料在远高于材料德拜温度的高压和温度下的热膨胀。体积弹性系数的温度和压力导数也将在高压和高温下确定。上述数据将允许建立地幔和地核材料的热状态方程，用于将实验室数据与地震观测到的地幔和地核的性质进行比较。这种类型的比较将有助于我们了解地球地幔和地核的热结构，地球下地幔的组成，以及地球地幔是否具有化学分层。

9974373 Heinz Recent advances in synchrotrons, diamond anvil cell design and laser heating techniques have opened up a new window of opportunity for the study of minerals at high pressures and simultaneous high temperatures. Using laser heating of diamond anvil cell samples and synchrotron radiation, the thermal equations of state of (Mg,Fe)SiO3 in the perovskite structure, (Mg,Fe)O, SiO2, Fe, Ni and FeS will be measured under the pressure and temperature conditions of the lower mantle and outermost core. These measurements will constrain the thermal expansion of these materials at high pressures and temperatures well above the Debye temperatures of the materials. The temperature and pressure derivatives of the bulk modulus will also be determined at high pressures and temperatures. The above data will allow thermal equations of state of mantle and core materials to be constructed for use in comparing laboratory data with the seismically observed properties of the Earth's mantle and core. This type of comparison will aid us in understanding the thermal structure of the Earth's mantle and core, the composition of the Earth's lower mantle, and whether or not the Earth's mantle is chemically layered.