Azadeh, Maryam ; Zhao, Changhao ; Pawadi, Apoorva ; Gao, Shuang ; Frömling, Till (2024)
Effect of iron acceptor doping and calcium donor doping in potassium sodium niobate-based lead-free piezoceramics.
In: Journal of the American Ceramic Society
doi: 10.1111/jace.19803
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Lead-free potassium sodium niobate (KNN) ferroelectrics have emerged as promising alternatives to lead-based materials due to their reduced toxicity and sometimes enhanced properties. The opportunity to modify the ferro- electric properties by doping, nevertheless, differs from lead-based ceramics. A much lower impact with increasing dopant concentration was observed. This study systematically investigates the differences in defect chemistry of Na0.475 K0.475 Li0.065 Nb 0.92 Ta0.08 O 3 ceramics through iron (Fe) acceptor doping and calcium (Ca) donor doping at varying concentrations. From the defect chemical point of view, it becomes evident that the impact of intrinsic defects on the electrical properties exceeds the effect of extrinsic defects induced by doping. The performance of the donor-doped (Ca2+) ceramics closely resembles that of undoped KNN. Thus, hardly any change in ferroelectric properties and conductivity is observed. For the Fe-doped samples, the conductivity and its contribution to the dielectric loss increased, which is not to the benefit of an application as a ferroelectric. Therefore, the concepts of “softening” and “hardening” of ferroelectric properties by doping are incompatible with regularly sintered KNN ceramics.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2024 |
| Autor(en): | Azadeh, Maryam ; Zhao, Changhao ; Pawadi, Apoorva ; Gao, Shuang ; Frömling, Till |
| Art des Eintrags: | Bibliographie |
| Titel: | Effect of iron acceptor doping and calcium donor doping in potassium sodium niobate-based lead-free piezoceramics |
| Sprache: | Englisch |
| Publikationsjahr: | 29 April 2024 |
| Verlag: | Wiley |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramic Society |
| Kollation: | 13 Seiten |
| DOI: | 10.1111/jace.19803 |
| Kurzbeschreibung (Abstract): | Lead-free potassium sodium niobate (KNN) ferroelectrics have emerged as promising alternatives to lead-based materials due to their reduced toxicity and sometimes enhanced properties. The opportunity to modify the ferro- electric properties by doping, nevertheless, differs from lead-based ceramics. A much lower impact with increasing dopant concentration was observed. This study systematically investigates the differences in defect chemistry of Na0.475 K0.475 Li0.065 Nb 0.92 Ta0.08 O 3 ceramics through iron (Fe) acceptor doping and calcium (Ca) donor doping at varying concentrations. From the defect chemical point of view, it becomes evident that the impact of intrinsic defects on the electrical properties exceeds the effect of extrinsic defects induced by doping. The performance of the donor-doped (Ca2+) ceramics closely resembles that of undoped KNN. Thus, hardly any change in ferroelectric properties and conductivity is observed. For the Fe-doped samples, the conductivity and its contribution to the dielectric loss increased, which is not to the benefit of an application as a ferroelectric. Therefore, the concepts of “softening” and “hardening” of ferroelectric properties by doping are incompatible with regularly sintered KNN ceramics. |
| Freie Schlagworte: | defects, electrical conductivity, piezoelectric materials/properties |
| 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: | 30 Apr 2024 05:17 |
| Letzte Änderung: | 30 Apr 2024 05:27 |
| PPN: | 517663139 |
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