The effect of alumina on the electrical conductivity of silicate perovskite

Science

Volumn 282, Issue 5390, 1998, Pages 922-924

  Xu, Yousheng ^a   McCammon, Catherine ^a   Poe, Brent T ^a  

^a UNIVERSITÄT BAYREUTH   (Germany)

Author keywords

[No Author keywords available]

Indexed keywords

ALUMINUM OXIDE; SILICATE;

ARTICLE; CALCULATION; COOLING; ELECTRIC CONDUCTIVITY; ELECTRIC FIELD; ELECTRIC POTENTIAL; HEATING; PRIORITY JOURNAL;

EID: 0032582485     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.282.5390.922     Document Type: Article

References (28)

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2. T. Irifune and A. E. Ringwood, in High-Pressure Research in Mineral Physics, vol. 39 of Geophysical Monograph Series (American Geophysical Union, Washington, DC, 1987), pp. 231-242; T. Irifune, Nature 370, 131 (1994).
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5. -1 for perovskite-magnesiowüstite assemblages are consistent with the hopping conduction mechanism [(24); T. J. Shankland, J. Peyronneau, J.-P. Poirier, Nature 366, 453 (1993); J. P. Poirier, A. Goddat, J. Peyronneau, Philos. Trans. R. Soc. London Ser. A 354, 1361 (1996)].
6. -1 for perovskite-magnesiowüstite assemblages are consistent with the hopping conduction mechanism [(24); T. J. Shankland, J. Peyronneau, J.-P. Poirier, Nature 366, 453 (1993); J. P. Poirier, A. Goddat, J. Peyronneau, Philos. Trans. R. Soc. London Ser. A 354, 1361 (1996)].
7. After the sample was placed inside the octahedral pressure medium, the entire cell assembly was dried overnight at 70°C in a vacuum furnace.
8. Y. Xu, B. T. Poe, D. C. Rubie, in The Review of High Pressure Science and Technology, Proceedings of JOINT AIRAPT-16 & HPCJ-38, M. Nakahara, Ed. (Japan Society of High-Pressure Science and Technology, Kyoto, Japan, 1998), vol. 7, pp. 1526-1528.
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10. MgO rings are also in contact with the sample but have no effect on oxygen fugacity.
11. 2 is the area of the electrodes and l is the length of the sample). The maximum error of the sample's geometry is 20% according to microscopic examination.
12. The conductivities in results from duplicate experiments differ by less than 0.07 logarithmic units, where the difference is likely due to uncertainty in sample geometry (a maximum uncertainty in geometry of 20% gives a difference of 0.08 logarithmic units in conductivity).
13. 3+ can be determined from the relative areas corrected for differences in recoil-free fraction [C. A. McCammon, Phys. Chem. Miner. 25, 292 (1998)].
14. 3+ can be determined from the relative areas corrected for differences in recoil-free fraction [C. A. McCammon, Phys. Chem. Miner. 25, 292 (1998)].
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20. 3, and so the effect of oxygen fugacity on Al-bearing perovskite is small. The effect of OH on the conductivity of silicate perovskite is still unknown. The effect of texture at high pressure is small if different minerals are homogeneously distributed and there is no partial melt present.
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28. We thank T. J. Shankland, A. G. Duba, and D. C. Rubie for discussions and suggestions and H. Fischer, K. Klasinski, D. Krausse, H. Küfner, and H. Schulze for technical assistance. D. C. Rubie and S. Karato donated the San Carlos orthopyroxene.