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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Electronic spin state of iron in lower mantle perovskite
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Electronic spin state of iron in lower mantle perovskite

机译：下地幔钙钛矿中铁的电子自旋态

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摘要

The electronic spin state of iron in lower mantle perovskite is one of the fundamental parameters that governs the physics and chemistry of the most voluminous and massive shell in the Earth. We present experimental evidence for spin-pairing transition in aluminum-bearing silicate perovskite (Mg,Fe)(Si,Al)O-3 under the lower mantle pressures. Our results demonstrate that as pressure increases, iron in perovskite transforms gradually from the initial high-spin state toward the final low-spin state. At 100 GPa, both aluminum-free and aluminum-bearing samples exhibit a mixed spin state. The residual magnetic moment in the aluminum-bearing perovskite is significantly higher than that in its aluminum-free counterpart. The observed spin evolution with pressure can be explained by the presence of multiple iron species and the occurrence of partial spin-paring transitions in the perovskite. Pressure-induced spin-pairing transitions in the perovskite would have important bearing on the magnetic, thermoelastic, and transport properties of the lower mantle, and on the distribution of iron in the Earth's interior.
机译：下地幔钙钛矿中铁的电子自旋态是控制地球上最大，最庞大的壳的物理和化学性质的基本参数之一。我们提供了在较低地幔压力下含铝硅酸盐钙钛矿（Mg，Fe）（Si，Al）O-3自旋配对转变的实验证据。我们的结果表明，随着压力的增加，钙钛矿中的铁逐渐从最初的高旋转状态逐渐转变为最终的低旋转状态。在100 GPa时，无铝和含铝样品均表现出混合自旋状态。含铝钙钛矿中的剩磁矩明显高于不含铝的钙钛矿中的剩磁矩。观察到的自旋随压力的演化可以用钙铁矿中多种铁的存在和部分自旋转变转变的出现来解释。钙钛矿中压力诱导的自旋配对转变将对下地幔的磁性，热弹性和传输性质以及地球内部铁的分布产生重要影响。

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