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Title: Mechanisms underpinning the ultrahigh piezoelectricity in Sm-doped 0.705Pb(Mg1/3Nb2/3)O3-0.295PbTiO3: Temperature-induced metastable local structure and field-induced polarization rotation

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5089477· OSTI ID:1761452

The solid solution of (100 – x)%Pb(Mg1/3Nb2/3)O3-x%PbTiO3 (PMN-xPT) exhibits ultrahigh piezoelectric and dielectric properties near the morphotropic phase boundary compositions and, as such, has been extensively studied in recent years. Recently, 2.5 mol. % Sm-doped PMN-29PT polycrystalline ceramics were reported to possess the highest piezoelectric coefficients (~1500 pC/N) among all reported piezoceramics, but the atomic-scale mechanisms for such high piezoelectric properties are not yet clear. Here, in situ X-ray diffraction and X-ray total scattering measurements during the application of an electric field, together with in situ total scattering measurement at different temperatures, were conducted for 2.5 mol. % Sm-doped PMN-29.5PT (2.5Sm-PMN-29.5PT). Both the largest field-induced strain and the piezoelectric response were found in the crystallites oriented with their 100 PC directions parallel to the applied field. The local Pb displacement was analyzed using the reverse Monte Carlo method based on the pair distribution functions at different temperatures, where a temperature-induced directional change of Pb displacement was observed. Based on the experimental observations, a field-induced polarization rotation is suggested to be the dominant mechanism for the ultrahigh piezoelectricity of the 2.5Sm-PMN-29.5PT ceramic, while the ease of polarization rotation is possibly attributed to the temperature-induced metastable local monoclinic symmetries with their polar axes close to 111 PC .

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC); China Scholarship Council (CSC); National Science Foundation (NSF)
Grant/Contract Number:
AC02-06CH11357; DMR-1409399; N62909-18-12168
OSTI ID:
1761452
Alternate ID(s):
OSTI ID: 1557382
Journal Information:
Journal of Applied Physics, Vol. 126, Issue 7; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 5 works
Citation information provided by
Web of Science

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