Sanlialp, Mehmet ; Shvartsman, Vladimir V. ; Acosta, Matias ; Dkhil, Brahim ; Lupascu, Doru C. (2015)
Strong electrocaloric effect in lead-free 0.65Ba(Zr0.2Ti0.8)O3-0.35(Ba0.7Ca0.3)TiO3 ceramics obtained by direct measurements.
In: Applied Physics Letters, 106 (6)
doi: 10.1063/1.4907774
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Solid solutions of (1 − x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 promise to exhibit a large electrocaloric effect (ECE), because their Curie temperature and a multiphase coexistence region lie near room temperature. We report on direct measurements of the electrocaloric effect in bulk ceramics 0.65Ba(Zr0.2Ti0.8)O3-0.35(Ba0.7Ca0.3)TiO3 using a modified differential scanning calorimeter. The adiabatic temperature change reaches a value of ΔTEC = 0.33 K at ∼65 °C under an electric field of 20 kV/cm. It remains sizeable in a broad temperature interval above this temperature. Direct measurements of the ECE proved that the temperature change exceeds the indirect estimates derived from Maxwell relations by about ∼50%. The discrepancy is attributed to the relaxor character of this material.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2015 |
| Autor(en): | Sanlialp, Mehmet ; Shvartsman, Vladimir V. ; Acosta, Matias ; Dkhil, Brahim ; Lupascu, Doru C. |
| Art des Eintrags: | Bibliographie |
| Titel: | Strong electrocaloric effect in lead-free 0.65Ba(Zr0.2Ti0.8)O3-0.35(Ba0.7Ca0.3)TiO3 ceramics obtained by direct measurements |
| Sprache: | Englisch |
| Publikationsjahr: | 9 Februar 2015 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Applied Physics Letters |
| Jahrgang/Volume einer Zeitschrift: | 106 |
| (Heft-)Nummer: | 6 |
| DOI: | 10.1063/1.4907774 |
| Kurzbeschreibung (Abstract): | Solid solutions of (1 − x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 promise to exhibit a large electrocaloric effect (ECE), because their Curie temperature and a multiphase coexistence region lie near room temperature. We report on direct measurements of the electrocaloric effect in bulk ceramics 0.65Ba(Zr0.2Ti0.8)O3-0.35(Ba0.7Ca0.3)TiO3 using a modified differential scanning calorimeter. The adiabatic temperature change reaches a value of ΔTEC = 0.33 K at ∼65 °C under an electric field of 20 kV/cm. It remains sizeable in a broad temperature interval above this temperature. Direct measurements of the ECE proved that the temperature change exceeds the indirect estimates derived from Maxwell relations by about ∼50%. The discrepancy is attributed to the relaxor character of this material. |
| Freie Schlagworte: | Electric fields; Relaxor ferroelectrics; Ceramics; Ferroelectric materials; Ferroelectric phase transitions |
| 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: | 10 Feb 2015 09:14 |
| Letzte Änderung: | 10 Feb 2015 09:14 |
| PPN: | |
| Sponsoren: | This work was supported by Deutsche Forschungsgemeinschaft, DFG, in the framework of the priority program “Ferroic Cooling” (SPP1599, Lu729/15-1) as well by the Leibniz program under RO954/22-1. |
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