Title
Some observations on the response of oxides to an applied field
Conference Dates
March 10-15, 2019
Abstract
Oxygen atoms in ionic oxides are stabilized as the oxide ion, O2- by the high lattice energy of the resulting crystal structures. In the gas phase, by contrast, the O2- ion has a positive enthalpy of formation and is spontaneously unstable to ionization. This talk will consider the conditions under which oxide ions in crystal lattices can ionize and the consequences for a diverse range of phenomena such as: flash sintering, memristive switching, involvement of redox-active anions in the operation of Li and Na battery cathodes and the dielectric breakdown of insulators. Depending on circumstances, an applied field may lead to enhanced n-type or p-type conductivity associated with the lattice oxygens, especially in the early stages of flash sintering, followed by the creation of a p-n junction and the luminescence characteristic of flash phenomena.
Recommended Citation
Anthony West, "Some observations on the response of oxides to an applied field" in "Electric Field Enhanced Processing of Advanced Materials II: Complexities and Opportunities", Rishi Raj, University of Colorado, USA Olivier Guillon, Forschungzentrum Jülich, Germany Hidehiro Yoshida, National Institute for Materials Science, Japan Eds, ECI Symposium Series, (2019). https://dc.engconfintl.org/efe_advancedmaterials_ii/60