Lee, Ju-Hyeon ; Lee, Geon-Ju ; Hoang, An-Phuc ; Frömling, Till ; Pham, Thuy-Linh ; Lee, Jong-Sook ; Jo, Wook (2022)
Suppression of high-temperature dielectric loss by designed thermal
annealing treatment in (Bi1/2Na1/2)TiO3 ceramics.
In: Journal of the European Ceramic Society, 42 (4)
doi: 10.1016/j.jeurceramsoc.2021.12.029
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Dielectrics for automobile applications generally require high-temperature reliability. Bi1/2Na1/2TiO3-based materials are excellent high-temperature dielectric candidates with relatively large temperature-insensitive dielectric responses and a maximum dielectric permittivity temperature as high as 300 ◦C. However, they suffer from a high dielectric loss that increases exponentially above 200 ◦C due to ionic conduction from thermally activated oxygen vacancy migration. Here, we demonstrate that the impact of ionic conduction on dielectric loss can be effectively suppressed by introducing a sodium deficiency and thermal annealing An appropriate combination of both treatments elevated the temperature insensitivity of the dielectric loss up to ~ 300 ◦C. A systematic investigation using impedance spectroscopy correlated with microstructure analysis revealed that the sodium deficiency and thermal annealing affected the mobile oxygen vacancy concentration differently.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2022 |
| Autor(en): | Lee, Ju-Hyeon ; Lee, Geon-Ju ; Hoang, An-Phuc ; Frömling, Till ; Pham, Thuy-Linh ; Lee, Jong-Sook ; Jo, Wook |
| Art des Eintrags: | Bibliographie |
| Titel: | Suppression of high-temperature dielectric loss by designed thermal annealing treatment in (Bi1/2Na1/2)TiO3 ceramics |
| Sprache: | Englisch |
| Publikationsjahr: | 17 Januar 2022 |
| Verlag: | Elsevier |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 42 |
| (Heft-)Nummer: | 4 |
| DOI: | 10.1016/j.jeurceramsoc.2021.12.029 |
| Kurzbeschreibung (Abstract): | Dielectrics for automobile applications generally require high-temperature reliability. Bi1/2Na1/2TiO3-based materials are excellent high-temperature dielectric candidates with relatively large temperature-insensitive dielectric responses and a maximum dielectric permittivity temperature as high as 300 ◦C. However, they suffer from a high dielectric loss that increases exponentially above 200 ◦C due to ionic conduction from thermally activated oxygen vacancy migration. Here, we demonstrate that the impact of ionic conduction on dielectric loss can be effectively suppressed by introducing a sodium deficiency and thermal annealing An appropriate combination of both treatments elevated the temperature insensitivity of the dielectric loss up to ~ 300 ◦C. A systematic investigation using impedance spectroscopy correlated with microstructure analysis revealed that the sodium deficiency and thermal annealing affected the mobile oxygen vacancy concentration differently. |
| Freie Schlagworte: | Bismuth sodium titanate, High-temperature dielectrics, Dielectric loss, Defect engineering |
| 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: | 18 Jan 2022 06:47 |
| Letzte Änderung: | 18 Jan 2022 06:47 |
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