Abstract The ferroelectric to antiferroelectric (FE-AFE) phase boundary design based on orthorhombic AFE phase and tetragonal FE phase is an effective method to develop high-performance pyroelectric materials due to the complete release of large electrical polarization in FE-AFE phase transition. Herein, we report the phase structure evolution in (1-x)Pb(Lu0.5Nb0.5)O3-xPbTiO3 (abbreviated as PLNT100x) ceramic system based on the relationship of tolerance factors versus electronegativity differences. The composition/temperature effects on FE-AFE phase transition behavior, pyroelectricity, depolarization temperature (Td) and energy harvesting performance were investigated systematically. Obviously, PLNT system displays superior pyroelectric characteristics as well as high Td. The maximum pyroelectric peak was 4.50 μC·cm−2·K − 1 over a wide temperature range from 28 °C to 167 °C. In addition, the obtained maximum pyroelectric energy harvesting density was 1.66 J/cm3 which was much higher than the currently reported values, indicating a potential candidate for pyroelectric energy conversion applications. Based on the modified Ginzburg−Landau−Devonshire (GLD) phenomenology, the composition/temperature driven phase transitions were discussed, and the temperature−electric field (T − E) phase diagram was accordance with actual phase diagram based on the experimental data.

中文翻译：

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Pb(Lu0.5Nb0.5)O3-xPbTiO3陶瓷的可调热释电、去极化温度和能量收集密度

摘要 基于正交 AFE 相和四方 FE 相的铁电到反铁电 (FE-AFE) 相界设计是开发高性能热电材料的有效方法，因为 FE-AFE 相变中的大电极化完全释放。在此，我们基于耐受因素与电负性差异的关系报告了 (1-x)Pb(Lu0.5Nb0.5)O3-xPbTiO3（缩写为 PLNT100x）陶瓷体系中的相结构演变。系统地研究了成分/温度对 FE-AFE 相变行为、热电性、去极化温度 (Td) 和能量收集性能的影响。显然，PLNT 系统显示出优越的热释电特性以及高 Td。最大热释电峰为 4。在 28 °C 至 167 °C 的宽温度范围内为 50 μC·cm−2·K − 1。此外，获得的最大热释电能量收集密度为 1.66 J/cm3，远高于目前报道的值，表明热释电能量转换应用的潜在候选者。基于修正的Ginzburg-Landau-Devonshire (GLD) 现象学，讨论了成分/温度驱动的相变，并且温度-电场(T - E) 相图与基于实验数据的实际相图一致。