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. 2016 Jun 10;7:11892. doi: 10.1038/ncomms11892

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Time-dependent increases in conductance were observed at different measurement voltages. Voltage V₂₃ was held constant at the values indicated in the legend (in Volts), while flowing current between electrodes 1 and 7. The electrode configuration is shown in Fig. 1. The conductance is enhanced by a factor of 190 at the highest voltage (field) shown. The measurements were taken at 370 °C, with the sample equilibrated at pO₂=150 torr.