Dynamical origins of weakly coupled relaxor behavior in Sn-doped (Ba,Ca)Ti O3-BiSc O3
(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.
(Less)
- author
- Pramanick, A. ; Nayak, S. ; Egami, T. ; Dmowski, W. ; Budisuharto, A. Setiadi ; Marlton, F. ; Jørgensen, M. R.V. LU ; Venkateshwarlu, S. and Beyer, K. A.
- organization
- publishing date
- 2021-06-01
- 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}}, }