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Effect of iron content on the electrical conductivity of perovskite and magnesiowuestite assemblages at lower mantle conditionsThe electrical conductivity of (Mg/0.76/Fe/0.24/)SiO3 perovskite and of an assemblage of (Mg/0.89/Fe/0.11/)SiO3 perovskite + (Mg/0.70/Fe/0.30/)O magnesiowiestite was measured at pressures of 45-80 GPa and temperatures from 295 to 3600 K. The apparent activation energy for electrical conduction is 0.24 (+ or - 0.10) eV for the perovskite and 0.20 (+ or - 0.08) eV for the perovskite + magnesiowuestite assemblage. Comparing present results with those derived previously for Fe-poor samples, it is found that the electrical conductivities of both the silicate perovskite and the perovskite + magnesiowuestite assemblage depend strongly on iron content. Thus, the electrical conductivity distribution inside the earth could provide an important constraint in modeling the composition of the lower mantle.
Document ID
19910048687
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Li, Xiaoyuan
(California Univ. Berkeley, CA, United States)
Jeanloz, Raymond
(California, University Berkeley, United States)
Date Acquired
August 14, 2013
Publication Date
April 10, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
91A33310
Distribution Limits
Public
Copyright
Other

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