Ceramic samples of lead zirconate titanate doped with lanthanum at the morphotropic phase boundary (PLZT 1.0/53/47) exhibit ferroelastic phase transition in the range from 135 to 150 °C. The study used structural analysis (XRD and Raman spectroscopy) and variation of dielectric and piezoelectric characteristics with temperature to analyze the ferroelastic and ferroelectric phase transition in PLZT. Measurements of X-ray diffraction patterns with temperature in the range from room temperature to 500 °C made it possible to monitor the evolution of the crystalline phases present in the sample, with a mixture of rhombohedral and tetragonal phases and initial concentrations of approximately 40 and 60%, respectively, as well as the evolution of the cell parameters and crystallite size. All techniques applied in this study showed the presence of phase changes in the temperature range from 135 to 150 °C, which is attributed to a displacive proper ferroelastic phase transition. This transition is associated with a decrease in the concentration of the rhombohedral phase and an increase in that of the tetragonal phase. Additionally, a transition at 350 °C is observed, which corresponds to the ferroelectric-paraelectric phase transition, coinciding with the results reported by Morgan Electro Ceramics for Type II Marine ceramics (PZT-5A).

在同形相界 (PLZT 1.0/53/47) 掺杂镧的锆钛酸铅陶瓷样品在 135 至 150 °C 的范围内表现出铁弹性相变。该研究使用结构分析（XRD 和拉曼光谱）以及介电和压电特性随温度的变化来分析 PLZT 中的铁弹性和铁电相变。在室温至 500 °C 的温度范围内测量 X 射线衍射图，可以监测样品中结晶相的演变，包括菱形和四方相的混合物，初始浓度约为 40 和分别为 60%，以及细胞参数和微晶尺寸的演变。本研究中应用的所有技术都表明，在 135 至 150 °C 的温度范围内存在相变，这归因于适当的铁弹性相变。这种转变与菱形相浓度的降低和四方相浓度的增加有关。此外，观察到 350 °C 的转变，这对应于铁电-顺电相转变，与 Morgan Electro Ceramics 报告的 II 型海洋陶瓷 (PZT-5A) 的结果一致。