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Real space mapping of oxygen vacancy diffusion and electrochemical transformations by hysteretic current reversal curve measurements

United States Patent

June 10, 2014
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
An excitation voltage biases an ionic conducting material sample over a nanoscale grid. The bias sweeps a modulated voltage with increasing maximal amplitudes. A current response is measured at grid locations. Current response reversal curves are mapped over maximal amplitudes of the bias cycles. Reversal curves are averaged over the grid for each bias cycle and mapped over maximal bias amplitudes for each bias cycle. Average reversal curve areas are mapped over maximal amplitudes of the bias cycles. Thresholds are determined for onset and ending of electrochemical activity. A predetermined number of bias sweeps may vary in frequency where each sweep has a constant number of cycles and reversal response curves may indicate ionic diffusion kinetics.
Kalinin; Sergei V. (Knoxville, TN), Balke; Nina (Knoxville, TN), Borisevich; Albina Y. (Knoxville, TN), Jesse; Stephen (Knoxville, TN), Maksymovych; Petro (Knoxville, TN), Kim; Yunseok (Guyeonggi-do, KR), Strelcov; Evgheni (Oak Ridge, TN)
UT-Battelle, LLC (Oak Ridge, TN)
13/ 566,327
August 3, 2012
STATEMENT REGARDING FEDERALLY FUNDED RESEARCH AND DEVELOPMENT This invention was made with government support under Contract No. DE-AC05-00OR22725 between UT-Battelle, LLC. and the U.S. Department of Energy. The government has certain rights in the invention.