Electrical conductivity of SiO2 at extreme conditions and planetary dynamos

Scipioni, Roberto; Stixrude, Lars; Desjarlais, Michael P.

doi:10.1073/pnas.1704762114

Electrical conductivity of SiO₂ at extreme conditions and planetary dynamos

Journal Article · Mon Aug 07 00:00:00 EDT 2017 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1704762114· OSTI ID:1497658

Scipioni, Roberto ^[1]; Stixrude, Lars ^[1]; Desjarlais, Michael P. ^[2]

Univ. College London, Bloomsbury (United Kingdom)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1497658

Report Number(s):: SAND--2017-4291J; 672238

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 34 Vol. 114; ISSN 0027-8424

Publisher:: National Academy of Sciences, Washington, DC (United States)Copyright Statement

Country of Publication:: United States

Language:: English

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Figures / Tables (5)

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58 GEOSCIENCES
Earth’s mantle
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