On the kinetic decomposition voltage of ternary oxides

Abstract

In a previous article the authors reported the kinetic unmixing and decomposition of the ternary oxide NiTiO₃ by an externally applied voltage. It was found [J. Chun, et al., J. Appl. Phys., 117, 2015, 124504] that while kinetic unmixing occurred for all magnitudes of the applied voltage, kinetic decomposition occurred only above a certain threshold voltage U^kin_d. The experimentally determined value of U^kin_d, however, did not coincide with the thermodynamic expectation according to the definition by Gibbs (). In this work the kinetic decomposition voltage U^kin_d of a ternary oxide ABO_ν is theoretically derived and compared with the experimental results. It turns out that U^kin_d depends on the mobility ratio of the cations and agrees with observed results for the system of NiTiO₃ within the error bounds.