特集：高圧メルトの実験最前線
内部抵抗加熱式ダイヤモンドアンビルセルを用いた鉄融点の決定
キーワード:
diamond-anvil cell,
resistive heating,
melting temperature,
iron,
Earth's core,
temperature of the core
2019 年 29 巻 2 号 p. 113-120
詳細
2019 年 29 巻 2 号 p. 113-120
The Earth's core is mainly composed of iron. Since liquid outer core coexists with solid at the inner core boundary (ICB), the melting temperature of iron provides a key constraint on the temperature of the core. In this article, we will introduce our recent progress on the experimental approach to determine the melting temperature of iron at high-pressure by using internal-resistance-heated diamond-anvil cell. We determined the melting temperature of pure iron up to 290 GPa, for the first time above 200 GPa by static compression experiments. A small extrapolation of the present experimental results yields a melting point of 5,500±220 K at the ICB.
