Abstract
A stability analysis of phase separation of charged species by spinodal decomposition is presented. The charge effects introduce a short wave number cutoff for linear perturbations about the homogeneous, neutral solution. Phase field calculations using a semi-implicit spectral method support this conclusion. This suggests that coarsening is limited in ionic solid systems that are unstable with respect to charged-phase separation.
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RE García, CM Bishop, WC Carter "Thermodynamically consistent variational principles with applications to electrically and magnetically active systems" Acta Materialia, 52(1):11-21, 2004. Abstract We propose a theoretical framework to derive thermodynamically consistent equilibrium equations and kinetic driving forces to describe the time evolution for electrically and magnetically active materials. This…
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OA Torres-Matheus, RE García, CM Bishop. “Phase Coexistence Near the Morphotropic Phase Boundary.” Acta Materialia. 164:577-585, 2019. https://doi.org/10.1016/j.actamat.2018.10.041 Abstract A novel multiphase field theory for ferroelectric systems in the vicinity of a polymorphic phase boundary (PPB) is developed by coupling the Landau-Devonshire thermodynamic potentials of the individual phases. The model naturally…
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O. A. Torres-Matheus, R. E. García, and C. M. Bishop "Microstructural phase coexistence kinetics near the polymorphic phase boundary." Acta Materialia, vol. 206, p. 116579, 2021. https://doi.org/10.1016/j.actamat.2020.116579 Abstract By implementing a novel multiphase field model for ferroelectric systems, the phase coexistence of the tetragonal (T) and rhombohedral (R) phases in Pb-free…
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