Abstract
AbstractFerroelectric Pb0.982–zLa0.012Δ0.006Baz(Zr0.55Ti0.45)O3 (PLZT; z = 0–6 mol%) ceramic compositions were fabricated by a mixed‐oxide method. X‐ray diffraction studies of sintered ceramics indicate the coexistence of rhombohedral and tetragonal phases in the 5 mol% Ba‐doped PLZT composition. Grain growth is inhibited with increasing Ba concentration in the PLZT system as evidenced by scanning electron micrographs. Dielectric constant and dielectric loss as a function of temperature suggest that ϵrt and tan δ are increased up to compositions containing 4 and 5 mol% Ba, respectively. The dielectric maximum (ϵTc) decreased to 4 mol% Ba and gradually increased to 6 mol% Ba, whereas, with increasing Ba concentration in the PLZT system, the Curie temperature (TC) decreased from the composition with no Ba to that with 6 mol% Ba. Relaxor behavior as a function of temperature and frequency was studied over the composition series. As the Ba concentration increased, the coercive field (Ec) showed a gradual enhancement. Remanent (Pr) and spontaneous (Ps) polarizations decreased to the 5 mol% Ba composition. Piezoelectric charge coefficient (d33), piezoelectric planar coupling coefficient (kp) and piezoelectric thickness coupling coefficient (kt) increased to the 4 mol% Ba composition, which are potential compositions for sensor and actuator applications. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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