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Re-entrant relaxor ferroelectric behaviour in Nb-doped BiFeO3–BaTiO3 ceramics

Yang, Ziqi ; Wang, Bing ; Brown, Thomas ; Milne, Steven J. ; Feteira, A. ; Wohninsland, Andreas ; Kodumudi Venkataraman, Lalitha ; Li, Yizhe ; Hall, D. A. (2023)
Re-entrant relaxor ferroelectric behaviour in Nb-doped BiFeO3–BaTiO3 ceramics.
In: Journal of Materials Chemistry C
doi: 10.1039/d2tc04702k
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

BiFeO3–BaTiO3 (BF–BT) solid solutions exhibit great promise as the basis for high temperature piezo-electric transducers and energy storage dielectrics, but the fundamental mechanisms governing their functional properties require further clarification. In the present study, both pure and niobium-doped 0.7BF–0.3BT ceramics are synthesized by solid state reaction and their structure–property relationships are systematically investigated. It is shown that substituting a low concentration of Ti with Nb at a level of 0.5 at% increases the resistivity of BF–BT ceramics and facilitates ferroelectric switching at high electric field levels. Stable planar piezoelectric coupling factor values are achieved with a variation from 0.35 to 0.45 over the temperature range from 100 to 430 1C. In addition to the ferroelectric- paraelectric phase transformation at the Curie point (B430 1C), a frequency-dependent relaxation of the dielectric permittivity and associated loss peak are observed over the temperature range from -50 to +150 °C. These effects are correlated with anomalous enhancement of the remanent polarization and structural (rhombohedral) distortion with increasing temperature, indicating the occurrence of a re-entrant relaxor ferroelectric transformation on cooling. The results of the study provide new insight into the thermal evolution of structure and the corresponding functional properties in BF–BT and related solid solutions.

Typ des Eintrags: Artikel
Erschienen: 2023
Autor(en): Yang, Ziqi ; Wang, Bing ; Brown, Thomas ; Milne, Steven J. ; Feteira, A. ; Wohninsland, Andreas ; Kodumudi Venkataraman, Lalitha ; Li, Yizhe ; Hall, D. A.
Art des Eintrags: Bibliographie
Titel: Re-entrant relaxor ferroelectric behaviour in Nb-doped BiFeO3–BaTiO3 ceramics
Sprache: Englisch
Publikationsjahr: 30 Januar 2023
Verlag: RSC Publishing
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of Materials Chemistry C
DOI: 10.1039/d2tc04702k
URL / URN: https://pubs.rsc.org/en/content/articlehtml/2023/tc/d2tc0470...
Kurzbeschreibung (Abstract):

BiFeO3–BaTiO3 (BF–BT) solid solutions exhibit great promise as the basis for high temperature piezo-electric transducers and energy storage dielectrics, but the fundamental mechanisms governing their functional properties require further clarification. In the present study, both pure and niobium-doped 0.7BF–0.3BT ceramics are synthesized by solid state reaction and their structure–property relationships are systematically investigated. It is shown that substituting a low concentration of Ti with Nb at a level of 0.5 at% increases the resistivity of BF–BT ceramics and facilitates ferroelectric switching at high electric field levels. Stable planar piezoelectric coupling factor values are achieved with a variation from 0.35 to 0.45 over the temperature range from 100 to 430 1C. In addition to the ferroelectric- paraelectric phase transformation at the Curie point (B430 1C), a frequency-dependent relaxation of the dielectric permittivity and associated loss peak are observed over the temperature range from -50 to +150 °C. These effects are correlated with anomalous enhancement of the remanent polarization and structural (rhombohedral) distortion with increasing temperature, indicating the occurrence of a re-entrant relaxor ferroelectric transformation on cooling. The results of the study provide new insight into the thermal evolution of structure and the corresponding functional properties in BF–BT and related solid solutions.

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe
Hinterlegungsdatum: 31 Jan 2023 06:09
Letzte Änderung: 31 Jan 2023 07:04
PPN: 504183079
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