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Large electrocaloric effect in lead-free ferroelectric Ba0.85Ca0.15Ti0.9Zr0.1O3 thin film heterostructure

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posted on 2021-03-01, 15:42 authored by Abhisikta Barman, Subhashree Chatterjee, Canlin Ou, Yau TseYau Tse, Niladri Banerjee, Sohini Kar-Narayan, Anuja Datta, Devajyoti Mukherjee
A large electrocaloric effect is reported in a strain-engineered Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCZT) thin film heterostructure driven by the near room-temperature electro-structural phase transition. An epitaxial BCZT/La0.7Sr0.3MnO3 (BCZT/LSMO) heterostructure was grown on single-crystal SrTiO3 (100) substrate using pulsed laser deposition. In-depth x-ray diffraction and x-ray spectroscopic analyses revealed the single-crystalline nature and stoichiometric growth of the heterostructure. Both temperature dependent x-ray diffraction and dielectric measurements revealed a broad second-order-type phase transition near 430 K in the BCZT/LSMO heterostructure. From detailed theoretical analyses of the experimental data it was confirmed that the phase transition around 430 K is second-order in nature, unlike the first order transition observed in bulk BCZT materials. Thermodynamic analyses of polarization revealed unprecedently large adiabatic temperature change of 13.5 K at 430 K under a field change of 1000 kVcm-1 ; hitherto unobserved in a lead-free material. Extremely broad adiabatic temperature change ΔT(T) curves over a wide working range of temperatures (330 K < T < 480 K) resulted in enhanced relative cooling powers which are higher than those reported so far in most electrocaloric materials. We propose that an interfacial strain-induced enhanced tetragonal distortion of the BCZT layer gives rise to these large electrocaloric effects in the BCZT/LSMO heterostructure system. The demonstration of large electrocaloric effect in the lead-free BCZT thin film may open up new pathways towards the design of artificial heterostructures for eco-friendly solid-state cooling applications.

Funding

Technical Research Center, Department of Science and Technology, Government of India (Grant No. AI/1/62/IACS/2015)

SERB Starting Research Grant, Department of Science and Technology, Government of India (Grant No. SRG/2019/000387)

SERB-Ramanujan Fellowship (Award SB/S2/RJN-057/2017)

Spin-Orbit Coupling-Driven Superconducting Spintronics

Engineering and Physical Sciences Research Council

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European Research Council Starting Grant (ERC-2014-STG-639526, NANOGEN)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering
  • Science

Department

  • Materials
  • Physics

Published in

APL Materials

Volume

9

Publisher

AIP Publishing LLC

Version

  • VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by AIP under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

2021-01-12

Publication date

2021-02-11

Copyright date

2021

ISSN

2166-532X

eISSN

2166-532X

Language

  • en

Depositor

Dr Niladri Banerjee. Deposit date: 15 January 2021

Article number

021115

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