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Dynamical origins of weakly coupled relaxor behavior in Sn-doped (Ba,Ca)Ti O3-BiSc O3

Pramanick, A. ; Nayak, S. ; Egami, T. ; Dmowski, W. ; Budisuharto, A. Setiadi ; Marlton, F. ; Jørgensen, M. R.V. LU orcid ; Venkateshwarlu, S. and Beyer, K. A. (2021) In Physical Review B 103(21).
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... (More)

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.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
103
issue
21
article number
214105
publisher
American Physical Society
external identifiers
  • scopus:85107798326
ISSN
2469-9950
DOI
10.1103/PhysRevB.103.214105
language
English
LU publication?
yes
id
c4c50080-edd1-4b96-aca0-f8170658be74
date added to LUP
2021-06-28 14:28:45
date last changed
2022-04-27 02:36:34
@article{c4c50080-edd1-4b96-aca0-f8170658be74,
  abstract     = {{<p>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.</p>}},
  author       = {{Pramanick, A. and Nayak, S. and Egami, T. and Dmowski, W. and Budisuharto, A. Setiadi and Marlton, F. and Jørgensen, M. R.V. and Venkateshwarlu, S. and Beyer, K. A.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{06}},
  number       = {{21}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Dynamical origins of weakly coupled relaxor behavior in Sn-doped (Ba,Ca)Ti O3-BiSc O3}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.103.214105}},
  doi          = {{10.1103/PhysRevB.103.214105}},
  volume       = {{103}},
  year         = {{2021}},
}