The electrical conductivity of calcite between 300 and 1200° C at a CO2 pressure of 40 bars |
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Authors: | Peter W Mirwald |
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Institution: | 1. Institut für Allgemeine und Angewandte Geophysik der Ludwig-Maximilians-Universit?t München, 8000, München, Germany (FRG)
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Abstract: | The electrical conductivity of calcite cleavage fragments was measured using direct current. Five temperature intervals, characterized by different activation energies of conduction, were established — T 1: (300°)–500° C, T 2: 500–725° C, T 3: 725°–800° C, T 4: 800°–985° C and T 5: 985°–(1,200)° C. The data above 600° C indicate various intrinsic conduction mechanisms which are likely to be related to disorder in the CO3-sublattice of calcite. The transitions between the temperature intervals T 2-T 3-T 4 and T 4-T 5 are probably correlated with high-temperature transitions of calcite at 800° and 985° C. Measurement of the thermoelectric voltage indicates a conductivity dominated by negatively charged carriers. |
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