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Domain structure and phase evolution in quenched and furnace cooled lead-free Na1/2Bi1/2TiO3–BaTiO3 ceramics

Fetzer, Ann-Katrin ; Wohninsland, Andreas ; Hofmann, Katrin ; Clemens, Oliver ; Kodumudi Venkataraman, Lalitha ; Kleebe, Hans-Joachim (2021)
Domain structure and phase evolution in quenched and furnace cooled lead-free Na1/2Bi1/2TiO3–BaTiO3 ceramics.
In: Open Ceramics, 5
doi: 10.1016/j.oceram.2021.100077
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Relaxor ferroelectric Na1/2Bi1/2TiO3-based materials have gained considerable attention as a potential lead-free alternative in recent years and can be tailored to exhibit giant strain or superior high power properties. Quenching (1-x)(Na1/2Bi1/2)TiO3-xBaTiO3 (NBT-BT) ceramics in air from the sintering temperature is beneficial in enhancing the depolarization temperature and the lattice distortion. Here, a comparative study using transmission electron microscopy (TEM) and X-ray diffraction is presented for unpoled, furnace cooled and quenched NBT-BT (3, 6, 9 and 12 mol. % BT) ceramics describing the domain structure and phase assemblage. In contrast to the furnace cooled sample, an enhanced lamellar domain contrast is observed for the quenched morphotropic phase boundary composition with 6 mol. % BT. The phase fraction obtained using high resolution X-ray diffraction changes from a near pseudocubic structure with small distortions towards a more pronounced rhombohedral and tetragonal phase assemblage. On the NBT-rich side (3 mol. % BT), a second rhombohedral phase emerges in addition to the R3c symmetry, exhibiting a long-range lamellar domain structure. Further, quenched and subsequently poled NBT-6BT features an increased tetragonal fraction associated with a highly lamellar domain contrast. The quenching treatment stabilizes the ferroelectric order, evidenced from the development of a long-range ferroelectric domain structure, which rationalizes the enhanced depolarization temperature.

Typ des Eintrags: Artikel
Erschienen: 2021
Autor(en): Fetzer, Ann-Katrin ; Wohninsland, Andreas ; Hofmann, Katrin ; Clemens, Oliver ; Kodumudi Venkataraman, Lalitha ; Kleebe, Hans-Joachim
Art des Eintrags: Bibliographie
Titel: Domain structure and phase evolution in quenched and furnace cooled lead-free Na1/2Bi1/2TiO3–BaTiO3 ceramics
Sprache: Englisch
Publikationsjahr: 10 März 2021
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Open Ceramics
Jahrgang/Volume einer Zeitschrift: 5
DOI: 10.1016/j.oceram.2021.100077
Kurzbeschreibung (Abstract):

Relaxor ferroelectric Na1/2Bi1/2TiO3-based materials have gained considerable attention as a potential lead-free alternative in recent years and can be tailored to exhibit giant strain or superior high power properties. Quenching (1-x)(Na1/2Bi1/2)TiO3-xBaTiO3 (NBT-BT) ceramics in air from the sintering temperature is beneficial in enhancing the depolarization temperature and the lattice distortion. Here, a comparative study using transmission electron microscopy (TEM) and X-ray diffraction is presented for unpoled, furnace cooled and quenched NBT-BT (3, 6, 9 and 12 mol. % BT) ceramics describing the domain structure and phase assemblage. In contrast to the furnace cooled sample, an enhanced lamellar domain contrast is observed for the quenched morphotropic phase boundary composition with 6 mol. % BT. The phase fraction obtained using high resolution X-ray diffraction changes from a near pseudocubic structure with small distortions towards a more pronounced rhombohedral and tetragonal phase assemblage. On the NBT-rich side (3 mol. % BT), a second rhombohedral phase emerges in addition to the R3c symmetry, exhibiting a long-range lamellar domain structure. Further, quenched and subsequently poled NBT-6BT features an increased tetragonal fraction associated with a highly lamellar domain contrast. The quenching treatment stabilizes the ferroelectric order, evidenced from the development of a long-range ferroelectric domain structure, which rationalizes the enhanced depolarization temperature.

Freie Schlagworte: Relaxor ferroelectric, NBT-BT, Quenched Poled Transmission electron microscopy
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Gemeinschaftslabor Nanomaterialien
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe
Hinterlegungsdatum: 11 Mär 2021 06:56
Letzte Änderung: 11 Mär 2021 06:56
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