Tunable pyroelectricity, depolarization temperature and energy harvesting density in Pb(Lu0.5Nb0.5)O3-xPbTiO3 ceramics. (March 2020)

• Record Type: Journal Article
• Authors: Yang, Xiaoming; Zhuo, Fangping; Wang, Chenxi; Liu, Ying; Wang, Zujian; He, Chao; Long, Xifa
• Is Part Of: Acta materialia. Volume 186(2020)
• Page Start: 523
• Page End: 532
• Publication Date: 2020-03
• Subjects: Pb(Lu0.5Nb0.5)O3-PbTiO3 -- Phase transition -- Pyroelectricity -- Energy harvesting density -- Phenomenology; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2020.01.032
• Languages: English
• ISSNs: 1359-6454

Abstract

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(Lu0.5 Nb0.5 )O3 - x PbTiO3 (abbreviated as PLNT100 x ) 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/cm 3 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. Graphical abstract: Image, graphical abstract