日時 ： ２００９年４月２４日（金）※16：30〜
場所 ： 愛媛大学理学部講義棟1F101室
要 旨
The Earth's core is believed to be composed of iron-nickel alloy with a small amount of one or more light elements (such as H, C, O, Si and S). Phase relations and crystal structures of iron alloys at the Earth's core condition are essential for understanding the seismic observations and the nature of the core. For recent years, we have developed experimental techniques of the high P-T generation using a laser-heated diamond-anvil cell (LH-DAC) and studied the phase relations of various iron alloys at high pressure and high temperature. For example, phase relations of iron and iron-nickel alloys were investigated up to 300 GPa and 2000 K. Iron-silicon alloys and iron-sulfur alloys were also studied up to 130 and 150 GPa, respectively, based on in-situ x-ray diffraction measurements along with chemical analysis of the quenched samples using a field-emission electron microprobe (FE-EPMA). In this talk, I will present experimental results on iron alloys, discuss the structure and composition of the Earth's core, and refer to future issues.
問い合わせ先：土屋 卓久 TEL （089）927-8198
E-mail takut@sci.ehime-u.ac.jp
