Ducinei Garcia

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Transparent relaxor ferroelectric ceramics of the system lanthanum modified lead magnesium niobate have been investigated for a variety of electro-optic properties that could make these materials alternatives to (Pb,La)(Zr,Ti)O3. However, a study that relates the to properties in function stoichiometric formula, has not been analyzed heretofore. Therefore,(More)
The structure of Pb(1-x)Ba(x)Zr(0.65)Ti(0.35)O(3) (PBZT) ceramic materials with 0.00 < or = x < or = 0.40 was studied using synchrotron X-ray powder diffraction data. According to the Rietveld refinements, the structure of PBZT ceramics with x = 0.00, 0.10 and 0.20 at room temperature was rhombohedral R3c. A phase transition from rhombohedral to cubic was(More)
Thermal expansion features of the (1-x)PbTiO<sub>3</sub>-xCaTiO<sub>3</sub> (PCT) ceramics were experimentally investigated in a wide temperature range (150-900K). Distinct anomalies of the thermal expansion coefficient were observed in all compositions. Typical negative thermal expansion behavior of the displacive ferroelectric lead titanate system still(More)
Temperature-dependent and frequency-dependent dielectric investigations have been performed in TbMnO3 polycrystals sintered in either oxidative or reductive atmospheres. The results revealed the occurrence of two dielectric anomalies above 100 K, which are caused by the thermal activation of charge carriers and their motion in grain cores and grain(More)
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