Abstract
The morphotrophic phase boundary compositions of Ba doped Pb 1 − 3x/2 La x Δ x (Zr y Ti 1 − y )O 3 (1.2/55/45) ceramics are synthesized for x = 0 to 6 mole% by mixed-oxide method and characterized for phase formation, microstructure, dielectric and relaxor studies. Density of ceramics is increased as Ba concentration is increased. Coexistence of rhombohedral and tetragonal phases is strong in 5 mole % Ba doped PLZT composition near morphotrophic phase boundary of PLZT phase diagram. Scanning electron micrographs indicate the grain size control as Ba concentration increases in PLZT system. ϵ rt and Tanδ are increased up to 4 mole% Ba doped PLZT system. Dielectric maximum (ϵ Tc ) is decreased to 4 mole% Ba and increased to 6 mole% Ba. Curie temperature (T c ) decreased substantially with increase of Ba concentration in PLZT system. Relaxor behavior of the system is characterized over range of 200 kHz.
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