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Title: Phase Evolution and Relaxor to Ferroelectric Phase Transition Boosting Ultrahigh Electrostrains in (1−x)(Bi1/2Na1/2)TiO3-x(Bi1/2K1/2)TiO3 Solid Solutions
Authors: Jing, R.
Zhang, L.
Hu, Q.
Alikin, D. O.
Shur, V. Y.
Wei, X.
Zhang, L.
Liu, G.
Zhang, H.
Jin, L.
Issue Date: 2022
Publisher: Chinese Ceramic Society
Elsevier BV
Citation: Phase Evolution and Relaxor to Ferroelectric Phase Transition Boosting Ultrahigh Electrostrains in (1−x)(Bi1/2Na1/2)TiO3-x(Bi1/2K1/2)TiO3 Solid Solutions / R. Jing, L. Zhang, Q. Hu et al. // Journal of Materiomics. — 2022. — Vol. 8. — Iss. 2. — P. 335-346.
Abstract: Owing to the complex composition architecture of these solid solutions, some fundamental issues of the classical (1−x)Bi1/2Na1/2TiO-xBi1/2K1/2TiO3 (BNT-xBKT) binary system, such as details of phase evolution and optimal Na/K ratio associated with the highest strain responses, remain unresolved. In this work, we systematically investigated the phase evolution of the BNT-xBKT binary solid solution with x ranging from 0.12 to 0.24 using not only routine X-ray diffraction and weak-signal dielectric characterization, but also temperature-dependent polarization versus electric field (P-E) and current versus electric field (I-E) curves. Our results indicate an optimal Na/K ratio of 81/19 based on high-field polarization and electrostrain characterizations. As the temperature increased above 100 °C, the x = 0.19 composition produces ultrahigh electrostrains (> 0.5%) with high thermal stability. The ultrahigh and stable electrostrains were primarily due to the combined effect of electric-field-induced relaxor-to-ferroelectric phase transition and ferroelectric-to-relaxor diffuse phase transition during heating. More specifically, we revealed the relationship between phase evolution and electrostrain responses based on the characteristic temperatures determined by both weak-field dielectric and high-field ferroelectric/electromechanical property characterizations. This work not only clarifies the phase evolution in BNT-xBKT binary solid solution, but also paves the way for future strain enhancement through doping strategies. © 2021 The Chinese Ceramic Society.
Keywords: BKT
Access: info:eu-repo/semantics/openAccess
SCOPUS ID: 85116705341
ISSN: 2352-8478
metadata.dc.description.sponsorship: This work was supported by the National Natural Science Foundation of China (Grant Nos. 51772239 and 51761145024 ) and the Fundamental Research Funds for the Central Universities ( XJTU ). The SEM work was done at International Center for Dielectric Research (ICDR), Xi'an Jiaotong University, Xi'an, China.
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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