Structural Investigation of Laser Processed PZT Ceramics
Materials with the composition Pb(Zr,Ti)O3, or PZT ceramics, are very important for industrial applications because they exhibit piezoelectric properties. PbTiO3 is a ferroelectric with a perovskite structure of tetragonal symmetry. PbZrO3 is anti-ferroelectric with orthorhombic structure. Solid solution ceramics based on PbTiO3 and PbZrO3 can be synthesized for all composition ratios . A morphotropic phase boundary (MPB) exists near the composition of 52 mol% PbZrO3 . Solid solutions containing less than ∿48 mol% PbTiO3 are rhombohedral while those containing more than ∿48 mol% PbTiO3 are tetragonal. The piezoelectric activity reaches a maximum when ceramic compositions are situated near the MPB. These ceramics are therefore the most useful for practical applications. In such PZT ceramics the coexistence of the two ferroelectric phases has been thoroughly demonstrated .
KeywordsTetragonal Phase Laser Processing Morphotropic Phase Boundary Rhombohedral Phase Lead Titanate
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