Abstract
Hot‐stage transmission electron microscopy studies of lanthanum‐modified lead zirconate titanate (Pb1‐xLax‐(Zr0.53Ti0.47)1‐x/4O3 (PLZT 100x/53/47) have been performed for compositions close to the morphotropic phase boundary (MPB). These studies have revealed the coexistence of relaxor and normal ferroelectric phases. Lanthanum substitution disrupts long‐range ferroelectric order, resulting in short‐range polar ordering. Investigations also have been performed using dielectric spectroscopy, electrically induced polarization, and strain methods. Three phases have been found for 10/53/47: a low‐temperature tetragonal phase, a high‐temperature cubic phase, and an intermediate‐temperature pseudocubic phase that exhibits relaxor ferroelectric behavior. Induced strain studies of 10/53/47 show a gradual change from butterfly‐shaped to slim‐quadratic loops with increasing temperature. In addition, the remanent strain decreases with increasing temperature, and reversible strain shows a peak at 80°C that corresponds to the appearance of intermediate phase.
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