Koruza, Jurij ; Rožič, B. ; Cordoyiannis, G. ; Malič, Barbara ; Kutnjak, Z. (2015)
Large electrocaloric effect in lead-free K0.5Na0.5NbO3-SrTiO3 ceramics.
In: Applied Physics Letters, 106 (20)
doi: 10.1063/1.4921744
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The electrocaloric effect (ECE), i.e., the adiabatic temperature change ΔT EC, of the lead-free relaxor ferroelectric 0.85K0.5Na0.5NbO3-0.15SrTiO3 (KNN-STO) ceramics is investigated. The ECE data obtained by a direct method show the existence of a large ECE near the temperature of the dielectric permittivity maximum. Due to the high break-down electric field, a large ΔT EC exceeding 1.2 K at 300 K and 1.9 K at 340 K was observed at 159 kV/cm in a broad temperature range of 80 K. Such a high ECE response near the room temperature is comparable to that found in lead-based ceramic materials, thus making KNN-STO a strong candidate to replace lead-based materials in future electrocaloric applications.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Koruza, Jurij ; Rožič, B. ; Cordoyiannis, G. ; Malič, Barbara ; Kutnjak, Z. |
| Art des Eintrags: | Bibliographie |
| Titel: | Large electrocaloric effect in lead-free K0.5Na0.5NbO3-SrTiO3 ceramics |
| Sprache: | Englisch |
| Publikationsjahr: | 28 Mai 2015 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Applied Physics Letters |
| Jahrgang/Volume einer Zeitschrift: | 106 |
| (Heft-)Nummer: | 20 |
| DOI: | 10.1063/1.4921744 |
| Kurzbeschreibung (Abstract): | The electrocaloric effect (ECE), i.e., the adiabatic temperature change ΔT EC, of the lead-free relaxor ferroelectric 0.85K0.5Na0.5NbO3-0.15SrTiO3 (KNN-STO) ceramics is investigated. The ECE data obtained by a direct method show the existence of a large ECE near the temperature of the dielectric permittivity maximum. Due to the high break-down electric field, a large ΔT EC exceeding 1.2 K at 300 K and 1.9 K at 340 K was observed at 159 kV/cm in a broad temperature range of 80 K. Such a high ECE response near the room temperature is comparable to that found in lead-based ceramic materials, thus making KNN-STO a strong candidate to replace lead-based materials in future electrocaloric applications. |
| Freie Schlagworte: | Relaxor ferroelectrics; Ceramics; Electric fields; Ferroelectric materials; Dielectric oxides |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 22 Mai 2015 07:48 |
| Letzte Änderung: | 22 Mai 2015 07:48 |
| PPN: | |
| Sponsoren: | This work was supported by the Slovenian Centre of Excellence NAMASTE and the Slovenian Research Agency through Grant Nos. L2-6768, P2-0105, P1-0125, and J2-6779-1. G.C. acknowledges the support of Project PE3 1535 within the Action, “Supporting Postdoctoral Researchers of the Operational Program “Education and Lifelong Learning”,” co-financed by the European Social Fund and the Greek State. |
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