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- W4247061736 abstract "Abstract. In this study, the grain boundary conductivity of quartz andesite was in situ measured under conditions of 0.5–2.0 GPa and 723–973 K using a YJ-3000t multi-anvil press and Solartron-1260 Impedance/Gain-phase Analyzer. Experimental results indicate that grain interior transport controls the higher frequencies (102–106 Hz), whereas the grain boundary process dominates the lower frequencies (10−1–102 Hz). At a given pressure and temperature range, the relationship between log σ and 1/T conforms to an Arrhenius relation. As temperature increased, both of the grain boundary and grain interior conductivities of quartz andesite increased. Under increasing pressure, however, both of the grain boundary and grain interior conductivities of the sample decreased. By the virtue of the dependence of grain boundary conductivity on pressure, the activation enthalpy and the activation volume were calculated at 0.77–1.03 eV and 5.29 ± 1.94 cm3 mol−1, respectively. Furthermore, the small polaron conduction mechanism between the ferrous and ferric ion is also discussed." @default.
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- W4247061736 date "2015-05-06" @default.
- W4247061736 modified "2023-10-16" @default.
- W4247061736 title "Experimental study on the electrical conductivity of quartz andesite at high temperature and high pressure: evidence of grain boundary transport" @default.
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- W4247061736 doi "https://doi.org/10.5194/sed-7-1555-2015" @default.
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