Relaxor behavior and electrothermal properties of Sn- And Nb-modified (Ba,Ca)TiO3 Pb-free ferroelectric
Venkateshwarlu, Sarangi ; Nayak, Sanjib ; Marlton, Frederick P. ; Weyland, Florian ; Novak, Nikola ; Maurya, Deepam ; Veerabhadraiah, Yashaswini ; Borkiewicz, Olaf ; Beyer, Kevin A. and Jørgensen, Mads R.V. LU
, et al.
(2020)
In Journal of Materials Research
35(8).
p.1017-1027
- Abstract
Relaxor ferroelectrics have drawn attention for possible applications in solid-state cooling and thermal energy harvesting, owing to their electrothermal energy conversion properties. Here, we have synthesized and characterized the structure-property correlations of a new Sn- and Nb-doped (Ba,Ca)TiO3 relaxor ferroelectric with large pyroelectric and electrocaloric effects over a broad temperature range. We observed two peaks for the temperature-dependent pyroelectric coefficient: (i) -(δP/δT) ∼ 563 μC/(m2 K) at T ∼ 270 K and (ii) -(δP/δT) ∼ 1021 μC/(m2 K) at T ∼ 320 K. In addition, a broad peak for electrocaloric temperature change is observed near 320 K with a relative cooling power of 1/417 J/kg. These... (More)
Relaxor ferroelectrics have drawn attention for possible applications in solid-state cooling and thermal energy harvesting, owing to their electrothermal energy conversion properties. Here, we have synthesized and characterized the structure-property correlations of a new Sn- and Nb-doped (Ba,Ca)TiO3 relaxor ferroelectric with large pyroelectric and electrocaloric effects over a broad temperature range. We observed two peaks for the temperature-dependent pyroelectric coefficient: (i) -(δP/δT) ∼ 563 μC/(m2 K) at T ∼ 270 K and (ii) -(δP/δT) ∼ 1021 μC/(m2 K) at T ∼ 320 K. In addition, a broad peak for electrocaloric temperature change is observed near 320 K with a relative cooling power of 1/417 J/kg. These properties could be correlated to structural changes observed using X-ray diffraction at two different temperature ranges in the material. Analysis of high-energy X-ray scattering and specific heat capacity data revealed a transition from the cubic to tetragonal phase near Tm ∼ 320 K, whereas an additional increase in the tetragonality (c/a) of the polar phase is observed below Ts ∼ 270 K.
(Less)
- author
- Venkateshwarlu, Sarangi
; Nayak, Sanjib
; Marlton, Frederick P.
; Weyland, Florian
; Novak, Nikola
; Maurya, Deepam
; Veerabhadraiah, Yashaswini
; Borkiewicz, Olaf
; Beyer, Kevin A.
and Jørgensen, Mads R.V.
LU
, et al. (More)
- Venkateshwarlu, Sarangi
; Nayak, Sanjib
; Marlton, Frederick P.
; Weyland, Florian
; Novak, Nikola
; Maurya, Deepam
; Veerabhadraiah, Yashaswini
; Borkiewicz, Olaf
; Beyer, Kevin A.
; Jørgensen, Mads R.V.
LU
and Pramanick, Abhijit
(Less)
- organization
- publishing date
- 2020-04-28
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- electrical properties, ferroelectric, X-ray diffraction
- in
- Journal of Materials Research
- volume
- 35
- issue
- 8
- pages
- 11 pages
- publisher
- Materials Research Society
- external identifiers
-
- scopus:85079488423
- ISSN
- 0884-2914
- DOI
- 10.1557/jmr.2020.25
- language
- English
- LU publication?
- yes
- id
- 29dc71b9-007e-432c-8096-a97e96766530
- date added to LUP
- 2020-02-25 15:41:40
- date last changed
- 2022-04-18 20:47:24
@article{29dc71b9-007e-432c-8096-a97e96766530,
abstract = {{<p>Relaxor ferroelectrics have drawn attention for possible applications in solid-state cooling and thermal energy harvesting, owing to their electrothermal energy conversion properties. Here, we have synthesized and characterized the structure-property correlations of a new Sn- and Nb-doped (Ba,Ca)TiO<sub>3</sub> relaxor ferroelectric with large pyroelectric and electrocaloric effects over a broad temperature range. We observed two peaks for the temperature-dependent pyroelectric coefficient: (i) -(δP/δT) ∼ 563 μC/(m<sup>2</sup> K) at T ∼ 270 K and (ii) -(δP/δT) ∼ 1021 μC/(m<sup>2</sup> K) at T ∼ 320 K. In addition, a broad peak for electrocaloric temperature change is observed near 320 K with a relative cooling power of 1/417 J/kg. These properties could be correlated to structural changes observed using X-ray diffraction at two different temperature ranges in the material. Analysis of high-energy X-ray scattering and specific heat capacity data revealed a transition from the cubic to tetragonal phase near T<sub>m</sub> ∼ 320 K, whereas an additional increase in the tetragonality (c/a) of the polar phase is observed below T<sub>s</sub> ∼ 270 K.</p>}},
author = {{Venkateshwarlu, Sarangi and Nayak, Sanjib and Marlton, Frederick P. and Weyland, Florian and Novak, Nikola and Maurya, Deepam and Veerabhadraiah, Yashaswini and Borkiewicz, Olaf and Beyer, Kevin A. and Jørgensen, Mads R.V. and Pramanick, Abhijit}},
issn = {{0884-2914}},
keywords = {{electrical properties; ferroelectric; X-ray diffraction}},
language = {{eng}},
month = {{04}},
number = {{8}},
pages = {{1017--1027}},
publisher = {{Materials Research Society}},
series = {{Journal of Materials Research}},
title = {{Relaxor behavior and electrothermal properties of Sn- And Nb-modified (Ba,Ca)TiO<sub>3</sub> Pb-free ferroelectric}},
url = {{http://dx.doi.org/10.1557/jmr.2020.25}},
doi = {{10.1557/jmr.2020.25}},
volume = {{35}},
year = {{2020}},
}