Meeting room "Glova", 4 floor, Integrated Research Building
Abstract
For a couple of decades, seismological observations have reported very complex structures of the Earth’s inner core, including P-wave anisotropy, hemispherical asymmetry, and existence of the inner most inner core. Since the Earth's inner core is believed to be composed of solid iron-nickel alloy, or possibly that with a small amount of one or more light elements (such as H, C, O, Si and S), determination of phase relation and crystal structure of iron alloys as a function of pressure, temperature and composition are essential for understanding these seismic observations of the Earth’s inner core. For recent years, I have continuously developed experimental techniques of high P-T generation using a laser-heated diamond-anvil cell (LH-DAC) and studied phase relations of various iron alloys, not only pure iron but also iron-nickel, -silicon, and -sulfur alloys, under multimegabar pressures based on in-situ synchrotron x-ray diffraction measurements. In this talk, I will present recent experimental results on iron alloys and discuss the structure and composition of the Earth's core.
For inquiry：Taku Tsuchiya TEL:（089）927-8198
E-mail takut@sci.ehime-u.ac.jp
