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CaSiO 3 Perovskite May Cause Electrical Conductivity Jump in the Topmost Lower Mantle
Author(s) -
Fei Hongzhan,
Huang Rong,
Yang Xiaozhi
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2017gl075070
Subject(s) - silicate perovskite , mantle (geology) , electrical resistivity and conductivity , perovskite (structure) , mineralogy , geology , conductivity , analytical chemistry (journal) , materials science , geophysics , chemistry , crystallography , physics , chromatography , quantum mechanics
The electrical conductivity of CaSiO 3 perovskite was measured in situ between 17–24 GPa and 1300–2000 K using a multianvil apparatus and Solartron 1260 Impedance/Gain‐Phase Analyzer in the frequency range of 10 7 –1 Hz. The activation energies are 95–100 and 100–120 kJ/mol, and the activation volumes are 0.06 ± 0.08 and −0.46 ± 0.03 cm 3 /mol, at 1300–1800 and 1800–2000 K, respectively. Conduction under lower mantle conditions may be dominated by the ionic diffusion of oxygen. The electrical conductivity of CaSiO 3 perovskite is higher than that of bridgmanite, majoritic garnet, and ferropericlase, the main constituents of the topmost lower mantle. Therefore, CaSiO 3 ‐perovsktie may significantly contribute to the electrical structure of the topmost lower mantle in spite of its relatively small volume proportion.