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Science 30 October 1998:
Vol. 282. no. 5390, pp. 922 - 924
DOI: 10.1126/science.282.5390.922
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Reports

The Effect of Alumina on the Electrical Conductivity of Silicate Perovskite

Yousheng Xu, * Catherine McCammon, Brent T. Poe

Measurements of the electrical conductivity of silicate perovskite at 25 gigapascals and 1400° to 1600°C show that the conductivity of (Mg,Fe)SiO3 perovskite containing 2.89 weight percent Al2O3 is about 3.5 times greater than that of aluminum-free (Mg0.915Fe0.085)SiO3 perovskite. The conduction mechanism in perovskite between 1400° and 1600°C is most likely by polarons, because Mössbauer studies show that the aluminum-bearing perovskite has about 3.5 times the amount of Fe3+ as the aluminum-free sample. A conductivity-depth profile from 660 to 2900 kilometers based on aluminum-bearing perovskite is consistent with geophysical models.

Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
*   To whom correspondence should be addressed. E-mail: yousheng.xu{at}uni-bayreuth.de

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