3 years ago

Electrical conductivity of SiO2 at extreme conditions and planetary dynamos [Earth, Atmospheric, and Planetary Sciences]

Electrical conductivity of SiO2 at extreme conditions and planetary dynamos [Earth, Atmospheric, and Planetary Sciences]
Michael P. Desjarlais, Lars Stixrude, Roberto Scipioni

Ab intio molecular dynamics simulations show that the electrical conductivity of liquid SiO2 is semimetallic at the conditions of the deep molten mantle of early Earth and super-Earths, raising the possibility of silicate dynamos in these bodies. Whereas the electrical conductivity increases uniformly with increasing temperature, it depends nonmonotonically on compression. At very high pressure, the electrical conductivity decreases on compression, opposite to the behavior of many materials. We show that this behavior is caused by a novel compression mechanism: the development of broken charge ordering, and its influence on the electronic band gap.

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