The electrical conductivities at elevated temperatures and pressures of polycrystalline manganese, cobalt and nickel orthosilicates

Details The electrical conductivities at elevated temperatures and pressures of polycrystalline manganese, cobalt and nickel orthosilicates The electrical conductivities at elevated temperatures and pressures of polycrystalline manganese, cobalt and nickel orthosilicates

Nov 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37.2379b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 11, pp.2379-2394

Computer Science

4

Scientific paper

Electrical conductivities of synthetic manganese, cobalt and nickel orthosilicates, also of mixed-cation orthosilicates containing together magnesium, iron and manganese, also magnesium, iron and nickel, have been studied as polycrystalline samples at temperatures up to 770°C and pressures up to 62 kbar. Electrical conductivities of these materials appear to depend on the presence of trivalent cations formed by partial oxidation; conductivities are less, by a factor of approximately 10 4 than for ferrous orthosilicate. The mechanism of electronic semiconduction in these materials is discussed; it is suggested that the effective carrier centres are an association of bivalent cation vacancy and trivalent cations. An activation energy in the range 0.4-1.2 eV is required; its variation with pressure is examined. Ionic conduction is also present, particularly with the cobalt compound. It is concluded that small amounts of manganese or nickel are unlikely to enhance significantly the conductivities of ferromagnesian orthosilicates in the mantle of the Earth, and that a more significant factor is the extent of oxidation of bivalent iron cation.

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