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Impact of polarization dynamics and charged defects on electrocaloric response of ferroelectric Pb(Zr,Ti)O3 ceramics

Weyland, Florian and Bradesko, Andraz and Ma, Yang-Bin and Koruza, Jurij and Xu, Bai-Xiang and Albe, Karsten and Rojac, Tadej and Novak, Nikola (2018):
Impact of polarization dynamics and charged defects on electrocaloric response of ferroelectric Pb(Zr,Ti)O3 ceramics.
In: Energy Technology, WILEY-VCH Verlag, Weinhem, Germany, pp. 1519-1525, 6, (8), ISSN 2194-4296, DOI: 10.1002/ente.201800140, [Article]

Abstract

The impact of charged point defects on the electrocaloric response of morphotropic Pb(Zr,Ti)O3 (PZT) ceramics is investigated using direct electrocaloric and polarization hysteresis measurements. The electrocaloric response determined for undoped, hard‐, and soft‐doped PZT is rationalized by considering the dipolar entropy change over polarization change and hysteresis losses. The highest electrocaloric effect is observed in poled hard PZT with the field applied along the poling direction, which is related to the reduced hysteresis losses caused by internal electric fields associated with defect complexes. The weak hysteretic dependency of polarization as function of the electric field in hard PZT also allows inducing an inverse electrocaloric effect. The experimental results are compared with model calculations that provide a physical interpretation. The results reveal how the electrocaloric response of ferroelectrics can be optimized by defect engineering.

Item Type: Article
Erschienen: 2018
Creators: Weyland, Florian and Bradesko, Andraz and Ma, Yang-Bin and Koruza, Jurij and Xu, Bai-Xiang and Albe, Karsten and Rojac, Tadej and Novak, Nikola
Title: Impact of polarization dynamics and charged defects on electrocaloric response of ferroelectric Pb(Zr,Ti)O3 ceramics
Language: English
Abstract:

The impact of charged point defects on the electrocaloric response of morphotropic Pb(Zr,Ti)O3 (PZT) ceramics is investigated using direct electrocaloric and polarization hysteresis measurements. The electrocaloric response determined for undoped, hard‐, and soft‐doped PZT is rationalized by considering the dipolar entropy change over polarization change and hysteresis losses. The highest electrocaloric effect is observed in poled hard PZT with the field applied along the poling direction, which is related to the reduced hysteresis losses caused by internal electric fields associated with defect complexes. The weak hysteretic dependency of polarization as function of the electric field in hard PZT also allows inducing an inverse electrocaloric effect. The experimental results are compared with model calculations that provide a physical interpretation. The results reveal how the electrocaloric response of ferroelectrics can be optimized by defect engineering.

Journal or Publication Title: Energy Technology
Volume: 6
Number: 8
Publisher: WILEY-VCH Verlag, Weinhem, Germany
Uncontrolled Keywords: ceramics, defect complexes, electrocaloric effect, ferroelectric materials, hysteresis losses
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Mechanics of functional Materials
11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 22 May 2018 06:08
DOI: 10.1002/ente.201800140
Funders: The authors acknowledge support by the Deutsche Forschungsgemeinschaft (DFG) under the SPP 1599, projects NO 1221/2‐1, XU 121/1–2, AL 578/16‐2., J.K. acknowledges the support by DFG KO 5100/1‐1., . R., A.B., and N.N. acknowledge the Slovenian Research Agency for providing funds in the frame of projects J2‐7526 and PR‐06804, P2‐0105, and program P1‐0125.
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