Some observations on the response of oxides to an applied field
March 10-15, 2019
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.
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