title: Interpreting equilibrium-conductivity and conductivity-relaxation measurements to establish thermodynamic and transport properties for multiple charged defect conducting ceramics.
abstract: A model-based interpretation of measured equilibrium conductivity and conductivity relaxation is developed to establish thermodynamic, transport, and kinetics parameters for multiple charged defect conducting (MCDC) ceramic materials. The present study focuses on 10% yttrium-doped barium zirconate (BZY10). In principle, using the Nernst-Einstein relationship, equilibrium conductivity measurements are sufficient to establish thermodynamic and transport properties. However, in practice it is difficult to establish unique sets of properties using equilibrium conductivity alone. Combining equilibrium and conductivity-relaxation measurements serves to significantly improve the quantitative fidelity of the derived material properties. The models are developed using a Nernst-Planck-Poisson (NPP) formulation, which enables the quantitative representation of conductivity relaxations caused by very large changes in oxygen partial pressure.
authors.affiliation: Mechanical Engineering, Colorado School of Mines, Golden, CO, USA. rjkee@mines.edu.
authors.forename: Huayang
authors.initials: H
authors.lastname: Zhu
authors.affiliation: Mechanical Engineering, Colorado School of Mines, Golden, CO, USA. rjkee@mines.edu.
authors.forename: Sandrine
authors.initials: S
authors.lastname: Ricote
authors.affiliation: CoorsTek, Inc., Golden, CO, USA.
authors.forename: W Grover
authors.initials: WG
authors.lastname: Coors
authors.affiliation: Mechanical Engineering, Colorado School of Mines, Golden, CO, USA. rjkee@mines.edu.
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Kee