Elastic and Anelastic Properties of Molten Iron and Iron Alloys: Applications to the Earth's Core

PI将调查弹性波速度Vp， 在Fe和Fe-Ni-S合金的纯熔体中， 与地球的外核有关。 通过使用 超声干涉技术，温度， Vp-1的成分和频率依赖性将是 在3至20 MHz的频率范围内以及在 温度范围从988 ℃到1650 ℃。 体积模量和 还将计算粘度。 通过描述任何 松弛机制，结果应该证明是非常有价值的 解释现有冲击波弹性的标准 纯Fe数据。 此外，还将对这些结果进行分析 从液体结构的角度来看。 静态结构 将计算因子并与先前的实验进行比较 理论值。 母体固体结构的影响 液体结构的研究和解释 它的地球物理意义。

The PIs will investigate the elastic wave velocity, Vp, and attenuation, Qp-1, in pure melts of Fe and Fe-Ni-S alloys which are relevant to the outer core of the earth. By using the ultrasonic interferometric technique, the temperature, compositional and frequency dependences of Vp-1 will be determined in the frequency range from 3 to 20 MHz and in the temperature range from 988oC to 1650oC. Bulk modulus and viscosity will also be calculated. By characterizing any relaxation mechanisms, the results should prove very valuable criteria with which to interpret existing shock-wave elasticity data on pure Fe. In addition, these results will be analysed from the point of view of liquid structure. The static structure factor will be calculated and compared to previous experimental and theoretical values. The influence of parent solid structure on liquid structure will be investigated and interpreted in terms of its geophysical significance.