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Hot metal

机译:铁水

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摘要

The solubility of oxygen in molten iron increases at high temperature. Could this explain why Earth's mantle is poor in iron oxide, whereas the mantle of Mars, which formed under cooler conditions, is not? The fate of light elements, such as oxygen, sulphur, carbon and hydrogen, during the formation of planetary cores has been hotly debated for decades. Forty years ago, Birch estimated that about 10% of Earth's core must be made of one or more of the light elements, to account for the density deficit seen in seismic observations when compared with a hypothetical core of pure iron metal. The advent of high-pressure, high-temperature technology in the 1980s has enabled the behaviour and distribution of elements between the mantle and core to be examined under conditions that simulate those in the deep planetary interior. Results from some of the first exploratory experiments suggested that sufficient oxygen would dissolve in iron metal under the extreme pressures at Earth's core-mantle boundary to account for the density deficit.
机译:高温下氧气在铁水中的溶解度增加。这可以解释为什么地球的地幔中的氧化铁含量低,而火星的地幔却是在较冷的条件下形成的吗?数十年来,行星状核形成过程中轻元素(如氧气,硫,碳和氢)的命运一直受到激烈争论。四十年前,伯奇(Birch)估计,与假想的纯铁金属核相比,地球的核中大约10%必须由一种或多种轻元素组成,以解决地震观测中发现的密度不足。 1980年代高压,高温技术的出现使得能够在模拟深行星内部条件的条件下检查地幔和岩心之间元素的行为和分布。一些初步探索性实验的结果表明,在地球芯-地幔边界的极端压力下,足够的氧气会溶解在铁金属中,以解决密度不足的问题。

著录项

  • 来源
    《Nature》 |2004年第6987期|p.33-35|共3页
  • 作者

    Carl B. Agee;

  • 作者单位

    Institute of Meteoritics, and in the Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, 87131-1126 New Mexico, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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