Relaxor behavior and electrothermal properties of Sn- and Nb-modified (Ba,Ca)TiO3 Pb-free ferroelectric

Sarangi Venkateshwarlu; Sanjib Nayak; Frederick P. Marlton; Florian Weyland; Nikola Novak; Deepam Maurya; Yashaswini Veerabhadraiah; Olaf Borkiewicz; Kevin A. Beyer; Mads R.V. Jorgensen; Abhijit Pramanick

doi:10.1557/jmr.2020.25

Relaxor behavior and electrothermal properties of Sn- and Nb-modified (Ba,Ca)TiO₃ Pb-free ferroelectric

Sarangi Venkateshwarlu, Sanjib Nayak, Frederick P. Marlton, Florian Weyland, Nikola Novak, Deepam Maurya, Yashaswini Veerabhadraiah, Olaf Borkiewicz, Kevin A. Beyer, Mads R.V. Jorgensen, Abhijit Pramanick^*

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Review › Research › peer-review

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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) -(∂P/∂T) ∼ 563 μC/(m² K) at T∼ 270 K and (ii) -(∂P/∂T) ∼ 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 ∼17 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.

Original language	English
Journal	Journal of Materials Research
Volume	35
Issue	8
Pages (from-to)	1017-1027
ISSN	0884-2914
DOIs	https://doi.org/10.1557/jmr.2020.25
Publication status	Published - Apr 2020

Keywords

electrical properties
ferroelectric
X-ray diffraction

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Venkateshwarlu2020_Article_RelaxorBehaviorAndElectrothermFinal published version, 1.22 MBLicence: CC BY

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@article{25a1b57f3ae84a5eadb54718277ca3b8,

title = "Relaxor behavior and electrothermal properties of Sn- and Nb-modified (Ba,Ca)TiO3 Pb-free ferroelectric",

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) -(∂P/∂T) ∼ 563 μC/(m2 K) at T∼ 270 K and (ii) -(∂P/∂T) ∼ 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 ∼17 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.",

keywords = "electrical properties, ferroelectric, X-ray diffraction",

author = "Sarangi Venkateshwarlu and Sanjib Nayak and Marlton, {Frederick P.} and Florian Weyland and Nikola Novak and Deepam Maurya and Yashaswini Veerabhadraiah and Olaf Borkiewicz and Beyer, {Kevin A.} and Jorgensen, {Mads R.V.} and Abhijit Pramanick",

year = "2020",

month = apr,

doi = "10.1557/jmr.2020.25",

language = "English",

volume = "35",

pages = "1017--1027",

journal = "Journal of Materials Research",

issn = "0884-2914",

publisher = "Springer International Publishing AG",

number = "8",

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Relaxor behavior and electrothermal properties of Sn- and Nb-modified (Ba,Ca)TiO₃ Pb-free ferroelectric. / Venkateshwarlu, Sarangi; Nayak, Sanjib; Marlton, Frederick P. et al.
In: Journal of Materials Research, Vol. 35, No. 8, 04.2020, p. 1017-1027.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Review › Research › peer-review

TY - JOUR

T1 - Relaxor behavior and electrothermal properties of Sn- and Nb-modified (Ba,Ca)TiO3 Pb-free ferroelectric

AU - Venkateshwarlu, Sarangi

AU - Nayak, Sanjib

AU - Marlton, Frederick P.

AU - Weyland, Florian

AU - Novak, Nikola

AU - Maurya, Deepam

AU - Veerabhadraiah, Yashaswini

AU - Borkiewicz, Olaf

AU - Beyer, Kevin A.

AU - Jorgensen, Mads R.V.

AU - Pramanick, Abhijit

PY - 2020/4

Y1 - 2020/4

N2 - 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) -(∂P/∂T) ∼ 563 μC/(m2 K) at T∼ 270 K and (ii) -(∂P/∂T) ∼ 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 ∼17 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.

AB - 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) -(∂P/∂T) ∼ 563 μC/(m2 K) at T∼ 270 K and (ii) -(∂P/∂T) ∼ 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 ∼17 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.

KW - electrical properties

KW - ferroelectric

KW - X-ray diffraction

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U2 - 10.1557/jmr.2020.25

DO - 10.1557/jmr.2020.25

M3 - Review

AN - SCOPUS:85079488423

SN - 0884-2914

VL - 35

SP - 1017

EP - 1027

JO - Journal of Materials Research

JF - Journal of Materials Research

IS - 8

ER -

Relaxor behavior and electrothermal properties of Sn- and Nb-modified (Ba,Ca)TiO₃ Pb-free ferroelectric

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