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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Sanjib Nayak
  • Frederick P. Marlton
  • Florian Weyland
  • Nikola Novak
  • Deepam Maurya
  • Yashaswini Veerabhadraiah
  • Olaf Borkiewicz
  • Kevin A. Beyer
  • Mads R.V. Jørgensen

Detail(s)

Original languageEnglish
Pages (from-to)1017-1027
Journal / PublicationJournal of Materials Research
Volume35
Issue number8
Online published10 Feb 2020
Publication statusPublished - 28 Apr 2020

Link(s)

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 ~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.

Research Area(s)

  • electrical properties, ferroelectric, X-ray diffraction

Citation Format(s)

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.; Jørgensen, Mads R.V.; Pramanick, Abhijit.

In: Journal of Materials Research, Vol. 35, No. 8, 28.04.2020, p. 1017-1027.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal