Analysis of Transitions Between Ferroelectric and Antiferroelectric States Under Conditions of Uniaxial Strain
The ferroelectric ceramic PZT 95/5, formed as a solid solution from the antiferroelectric, PbZrO 3 , and the ferroelectric, PbTiO 3 , is known to transform to an antiferroelectric state under pressure. This transition can be used to convert mechanical energy to electrical energy under shock conditions. A mathematical model for this transformation has been developed for conditions of uniaxial strain. It uses two order parameters as internal state variables to reflect the microscopic state of the material. One order parameter corresponds to the spontaneous lattice polarization. The other represents the microscopic alignment of the spontaneous polarization within the lattice with parallel alignment corresponding to a ferroelectric state and anti-parallel alignment corresponding to an antiferroelectric state. A numerical method for solution is used to illustrate dynamic material response resulting from the transition.
KeywordsSpontaneous Polarization Thermodynamic Potential Sandia National Laboratory Uniaxial Strain Internal State Variable
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