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Quenching‐circumvented ergodicity in relaxor Na 1/2 Bi 1/2 TiO 3 ‐BaTiO 3 ‐K 0.5 Na 0.5 NbO 3
Author(s) -
Wei Qiumei,
Riaz Adeel,
Zhukov Sergey,
Hofmann Kathrin,
Zhu Mankang,
Hou Yudong,
Rödel Jürgen,
Kodumudi Venkataraman Lalitha
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17708
Subject(s) - materials science , tetragonal crystal system , condensed matter physics , dielectric , quenching (fluorescence) , analytical chemistry (journal) , mineralogy , crystallography , crystal structure , optics , physics , chemistry , optoelectronics , chromatography , fluorescence
Quenching alkaline bismuth titanates from sintering temperatures results in increased lattice distortion and consequently higher depolarization temperature. This work investigates the influence of quenching on the ergodicity of relaxor Na 1/2 Bi 1/2 TiO 3 ‐BaTiO 3 ‐K 0.5 Na 0.5 NbO 3 . A distinct departure from ergodicity is evidenced from the increase in remanent polarization and the absence of frequency dispersion in the permittivity response of poled samples. Further, the samples exhibit enhanced negative strain upon application of electric field, indicating proclivity towards correlated polar nanoregions, corroborated by the enhanced tetragonal distortion. As a result, ergodic relaxor Na 1/2 Bi 1/2 TiO 3 ‐6BaTiO 3 ‐3K 0.5 Na 0.5 NbO 3 exhibits a depolarization temperature of 85°C with a 60% increase in remanent polarization and approximately a threefold increase in remanent strain upon quenching. Quenching‐induced changes in the local environment of Na + and Bi 3+ cations hinder the development of ergodicity promoted by the A‐site disorder. These results provide new insight into tailoring ergodicity of relaxor ferroelectrics.