Dynamical origins of weakly coupled relaxor behavior in Sn-doped (Ba, Ca)TiO3-BiScO3

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

View graph of relations

Author(s)

  • Sanjib Nayak
  • Takeshi Egami
  • W. Dmowski
  • A. Setiadi Budisuharto
  • F. Marlton
  • M. R. V. Jørgensen
  • K. A. Beyer

Detail(s)

Original languageEnglish
Article number214105
Number of pages13
Journal / Publication Physical Review B: covering condensed matter and materials physics
Volume103
Issue number21
Online published4 Jun 2021
Publication statusPublished - Jun 2021

Abstract

The peculiar characteristics of relaxors, viz., a frequency-dependent dielectric permittivity peak and good functional properties (dielectric, electromechanical, electrocaloric, etc.), are attributed to nanoscale regions with correlated dipoles, or polar nanoregions (PNRs). However, the exact nature of PNRs and their contribution to relaxor behavior remains debatable. In recent years, solid solutions of BaTiO3-BiMeO3 (where Me is a metal), have emerged as an interesting system with characteristics in between that of relaxors and dipole glasses. Here, we have examined the atomistic origins of weakly coupled relaxor behavior, specifically with regard to formation of PNRs, in Sn-doped (1−x)(Ba, Ca)TiO3-xBiScO3 using macroscopic polarization and neutron dynamic pair distribution function measurements. We show that the short-range atomic correlations observed within the PNRs dynamically fluctuate with frequencies of the order of THz. Furthermore the composition-dependent dielectric and polarization behaviors are critically influenced by the relative stability of the atomic correlations near ∼1 THz, while the instantaneous atomic correlations are largely independent of x. The current results are discussed based on a model of intrinsic local modes distributed in a dielectrically soft matrix. 

Citation Format(s)

Dynamical origins of weakly coupled relaxor behavior in Sn-doped (Ba, Ca)TiO3-BiScO3. / Pramanick, Abhijit; Nayak, Sanjib; Egami, Takeshi; Dmowski, W.; Budisuharto, A. Setiadi; Marlton, F.; Jørgensen, M. R. V.; Venkateshwarlu, S.; Beyer, K. A.

In: Physical Review B: covering condensed matter and materials physics, Vol. 103, No. 21, 214105, 06.2021.

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