Structure, ferroelectric, and dielectric properties of (Na1−2xCax)NbO3 ceramics

dc.contributor.author Liu, Binzhi
dc.contributor.department Materials Science and Engineering
dc.date.accessioned 2021-12-09T16:41:23Z
dc.date.available 2021-12-09T16:41:23Z
dc.date.issued 2021-03-14
dc.description.abstract Mimicking the scheme of incorporating La3+ to Pb(Zr1−xTix)O3, Ca2+ is used to substitute Na+ in the lead-free NaNbO3 compound, with A-site vacancy introduced to maintain charge neutrality. The anticipated relaxor behavior is expected to suppress the remanent polarization and improve the energy storage properties of NaNbO3-based ceramics. Specifically, (Na1−2xCax)NbO3 (x = 0.01, 0.02, 0.04, 0.08) ceramics were prepared with the solid-state method, and their structures and electric properties were investigated. X-ray diffraction and transmission electron microscopy reveal the existence of minor amount of CaNb2O6 second phase. Polarization vs. electric field hysteresis loop measurements verify the suppression of remanent polarization in compositions of x ≤ 0.04. The temperature-dependent dielectric tests indicate that both the relaxation and diffuseness parameters monotonically increase with Ca2+ content. The results demonstrate that the introduction of a smaller donor dopant and charge-compensating vacancies on the A-site in NaNbO3 is an effective strategy to disrupt the long-range dipole order.
dc.description.comments This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1557/s43578-020-00020-5. Copyright 2021 The Author(s), under exclusive licence to The Materials Research Society 2021. Posted with permission.
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/9z0KeRor
dc.language.iso en
dc.publisher Springer Nature
dc.source.uri https://doi.org/10.1557/s43578-020-00020-5 *
dc.subject NaNbO3
dc.subject Transmission electron microscopy
dc.subject Ferroelectric
dc.subject Relaxor
dc.subject Hysteresis
dc.subject.disciplines DegreeDisciplines::Engineering::Materials Science and Engineering::Ceramic Materials
dc.title Structure, ferroelectric, and dielectric properties of (Na1−2xCax)NbO3 ceramics
dc.type Article
dspace.entity.type Publication
relation.isAuthorOfPublication 62adb010-61c7-4fc2-a651-d8b152a926a9
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
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