Effect of iron oxidation state on the electrical conductivity of the Earth's lower mantle.

  title={Effect of iron oxidation state on the electrical conductivity of the Earth's lower mantle.},
  author={Vasily Potapkin and Catherine McCammon and Konstantin Glazyrin and Anastasia Kantor and Ilya Kupenko and Clemens Prescher and Ryosuke Sinmyo and G. V. Smirnov and Aleksandr I Chumakov and Rudolf R{\"u}ffer and Leonid Dubrovinsky},
  journal={Nature communications},
Iron can adopt different spin states in the lower mantle. Previous studies indicate that the dominant lower-mantle phase, magnesium silicate perovskite (which contains at least half of its iron as Fe(3+)), undergoes a Fe(3+) high-spin to low-spin transition that has been suggested to cause seismic velocity anomalies and a drop in laboratory-measured electrical conductivity. Here we apply a new synchrotron-based method of Mössbauer spectroscopy and show that Fe(3+) remains in the high-spin state… CONTINUE READING
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