Charged-defect transport induced stress in mixed ionic-electronic conducting ceramic membranes
The electro-chemo-mechanical response within mixed-conducting ceramic membranes is characterized using numerical and analytic solutions. The approach is based on computational modeling using extensions of the Nernst-Planck-Poisson(NPP) formulation. In addition to diffusion and migration contributions, the Nernst-Planck fluxes are extended to incorporate the contribution of hydrostatic-stress gradients. The local stress gradients are the result of atomic-scale strain and distortion within the crystal lattice structure associated with changes in the local stoichiometry of the crystal lattice. This ...
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