In:
Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 96, No. B4 ( 1991-04-10), p. 6113-6120
Abstract:
We have measured the electrical conductivity of (Mg 0.76 Fe 0.24 )SiO 3 perovskite and of an assemblage of (Mg 0.89 Fe 0.11 )SiO 3 perovskite + (Mg 0.70 Fe 0.30 )O magnesiowüstite at pressures of 45–80 GPa and temperatures from 295 to 3600 K. The apparent activation energy for electrical conduction is 0.24 (± 0.10) eV for the perovskite and 0.20 (± 0.08) eV for the perovskite + magnesiowüstite assemblage. Comparing our present results with those derived previously for Fe‐poor samples, we find that the electrical conductivities of both the silicate perovskite and the perovskite + magnesiowüstite 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.
Type of Medium:
Online Resource
ISSN:
0148-0227
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1991
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