Abstract
PLZT compositions near the morphotropic boundary phase (Zr/Ti = 53/47) were studied changing the lanthanum fraction from 0.5 to 14 at%. The grain size and the porosity due to the lanthanum addition showed an important influence on the dielectric properties of the samples. Dielectric and pyroelectric studies show that the ceramics of lower lanthanum concentrations are suitable materials for practical applications. The ceramic's response subjected to light radiation was investigated. The radiation is absorbed near the material surface and its temperature rises leading to a change in the electrical polarization of the bulk material. This phenomenon is analyzed and correlated with the absorbed light on the surface of the material.
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