Broad Distribution of Local Polar States Generates Large Electrothermal Properties in Pb-Free Relaxor Ferroelectrics
Marlton, Frederick P. ; Nayak, Sanjib ; Venkateshwarlu, Sarangi ; Chan, Ngai Hang ; Kong, Jing ; Zhang, Yuanpeng ; Tucker, Matthew G. ; Jørgensen, Mads Ry Vogel LU
and Pramanick, Abhijit
(2021)
In Chemistry of Materials
33(22).
- Abstract
Electrothermal energy conversion provides attractive solutions for global energy management, such as energy harvesting from waste heat using pyroelectric energy conversion (PEC) and efficient cooling of portable electronics or data servers using the electrocaloric effect. Relaxor ferroelectrics are attractive for electrothermal energy conversion because of their large pyroelectric coefficients over a wide temperature range. Although Pb-based relaxors are well-known, toxicity concerns have mandated the intense search for Pb-free alternatives. Here, we engineered (Ba,Ca)TiO3-based relaxors based on a multisite doping strategy, which show promising electrothermal performance, viz. a maximum PEC efficiency of 14% and electrocaloric... (More)
Electrothermal energy conversion provides attractive solutions for global energy management, such as energy harvesting from waste heat using pyroelectric energy conversion (PEC) and efficient cooling of portable electronics or data servers using the electrocaloric effect. Relaxor ferroelectrics are attractive for electrothermal energy conversion because of their large pyroelectric coefficients over a wide temperature range. Although Pb-based relaxors are well-known, toxicity concerns have mandated the intense search for Pb-free alternatives. Here, we engineered (Ba,Ca)TiO3-based relaxors based on a multisite doping strategy, which show promising electrothermal performance, viz. a maximum PEC efficiency of 14% and electrocaloric refrigeration capacity of 115 J/kg. Using local-scale structural analysis, we provide an atomistic model for large electrothermal properties in the newly designed Pb-free ferroelectrics, whereby a temperature-independent continuous distribution of cation displacement directions creates easy pathways for microscopic polarization reorientation. This research provides key structural insight for future atomic-scale engineering of environmentally sustainable ferroelectrics in energy applications.
(Less)
- author
- Marlton, Frederick P.
; Nayak, Sanjib
; Venkateshwarlu, Sarangi
; Chan, Ngai Hang
; Kong, Jing
; Zhang, Yuanpeng
; Tucker, Matthew G.
; Jørgensen, Mads Ry Vogel
LU
and Pramanick, Abhijit
- organization
- publishing date
- 2021-11-23
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Chemistry of Materials
- volume
- 33
- issue
- 22
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- scopus:85119059541
- ISSN
- 0897-4756
- DOI
- 10.1021/acs.chemmater.1c03066
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2021 American Chemical Society.
- id
- c5ddab9a-3411-4c02-9f21-ad88bed4a123
- date added to LUP
- 2021-12-09 08:48:13
- date last changed
- 2022-04-27 06:33:13
@article{c5ddab9a-3411-4c02-9f21-ad88bed4a123,
abstract = {{<p>Electrothermal energy conversion provides attractive solutions for global energy management, such as energy harvesting from waste heat using pyroelectric energy conversion (PEC) and efficient cooling of portable electronics or data servers using the electrocaloric effect. Relaxor ferroelectrics are attractive for electrothermal energy conversion because of their large pyroelectric coefficients over a wide temperature range. Although Pb-based relaxors are well-known, toxicity concerns have mandated the intense search for Pb-free alternatives. Here, we engineered (Ba,Ca)TiO3-based relaxors based on a multisite doping strategy, which show promising electrothermal performance, viz. a maximum PEC efficiency of 14% and electrocaloric refrigeration capacity of 115 J/kg. Using local-scale structural analysis, we provide an atomistic model for large electrothermal properties in the newly designed Pb-free ferroelectrics, whereby a temperature-independent continuous distribution of cation displacement directions creates easy pathways for microscopic polarization reorientation. This research provides key structural insight for future atomic-scale engineering of environmentally sustainable ferroelectrics in energy applications. </p>}},
author = {{Marlton, Frederick P. and Nayak, Sanjib and Venkateshwarlu, Sarangi and Chan, Ngai Hang and Kong, Jing and Zhang, Yuanpeng and Tucker, Matthew G. and Jørgensen, Mads Ry Vogel and Pramanick, Abhijit}},
issn = {{0897-4756}},
language = {{eng}},
month = {{11}},
number = {{22}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Chemistry of Materials}},
title = {{Broad Distribution of Local Polar States Generates Large Electrothermal Properties in Pb-Free Relaxor Ferroelectrics}},
url = {{http://dx.doi.org/10.1021/acs.chemmater.1c03066}},
doi = {{10.1021/acs.chemmater.1c03066}},
volume = {{33}},
year = {{2021}},
}