|About this Abstract
||MS&T23: Materials Science & Technology
||Late News Poster Session
||F-15: Capacitive Discharge in Flash Experiments under Air and Ar Atmosphere
||Seohyeon Jo, Minhyea Lee, Ian Andreas Leahy, Xavier Vendrell, Rishi Raj
|On-Site Speaker (Planned)
We report the capacitance discharge formed at the electrodes in flash experiments with yttria-stabilized zirconia. The experiments were carried out by disconnecting the current and short-circuiting the electrodes through a resistor. The time-dependent voltage across the resistor was measured. As expected in an RC circuit, the current decayed exponentially with time, which allowed the capacitance measurement. Experiments were carried out in Air and Ar. Somewhat unexpectedly, the sign of the voltage expressed at the electrodes was opposite in Air and Ar. The measured capacitance is attributed to the formation of space charge adjacent to the electrodes. In the case of Ar experiments, the capacitance is substantial, approaching 1 F; the space charge is expected to be constituted from ions. In the air experiments, the specimen becomes insulating, trapping the electrons as a space charge. Hall effect measurements and XPS of electronically conducting single-crystal cubic zirconia are reported.