Structure-property relationships in PLZT ceramic materials

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Abstract
The properties which are of prime interest for the application of ferroelectric materials are often critically dependent on crystal structure. Understanding of these properties can usually be advanced if the crystal structure of the material is investigated and its properties measured under similar conditions. In the PLZT system the three ferroelectric phases, with tetragonal, orthorhombic or rhombohedral structures, are all very close in energy to the cubic phase. The unusual properties of these materials can be understood in terms of the properties of these phases, the compositional extent of the phase fields and the conditions of field, stress or temperature under which transformations occur between them. It is possible to define the conditions for the occurrence of transparent ceramics and to provide a basis for understanding the scattering effects in PLZT. The approach also serves as a guide in optimizing the electro-optic and pyroelectric properties of these materials.

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