Antiferroelectric-ferroelectric phase transition and negative electrocaloric effect in alkaline-earth element doped PbZrO3 thin films

Yuan Y. ¹Sun B. ¹Guo M. ¹Gao Y. ¹Zhu X. ¹Sun H. ¹Zhao J. ¹Lou X. ¹Wu M. ²Liu Y. ²Gao J. ²Liu Q.³

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作者信息

1. Frontier Institute of Science and Technology and State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University
2. State Key Laboratory of Electrical Insulation and Power Equipment Xi'an Jiaotong University
3. State Key Laboratory for Strength and Vibration of Mechanical Structures Xi'an Jiaotong University
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Abstract

Electrocaloric effect (ECE) in dielectric materials has attracted much attention due to its promising applications in solid-state cooling devices. In this work, alkaline-earth doped PbZrO3 antiferroelectric thin films (Pb0.9A0.1ZrO3 (A=Ca, Sr, and Ba)) were deposited by a sol-gel method and its antiferroelectric-ferroelectric phase competition as well as the negative ECE were studied. It is found that Ca2+ and Sr2+ expand the antiferroelectric phase region while Ba2+ reduces it, due to the different ion radii of these alkaline-earth elements. As a result, the Pb0.9Sr0.1ZrO3 thin film exhibits an enhanced negative ECE with ΔT of around ? 10.6 K under 450 kV/cm whereas the Pb0.9Ba0.1ZrO3 thin film shows a decreased negative ECE with ΔT of around ? 2.5 K under 200 kV/cm, as compared with the pristine PbZrO3 thin films (with ΔT of around ?7.3 K under 300 kV/cm). This work provides an effective method to enhance the negative ECE of antiferroelectrics in electrical cooling applications by adjusting their antiferroelectric to ferroelectric phase transition.

Key words

Antiferroelectric films/Negative electrocaloric effect/PbZrO3/Phase transition

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出版年

2022

Journal of Alloys and Compounds

EISCI

ISSN：0925-8388

被引量1

参考文献量33

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