Dynamical origins of weakly coupled relaxor behavior in Sn-doped (Ba,Ca)TiO3BiScO3

A. Pramanick, S. Nayak, T. Egami, W. Dmowski, A. Setiadi Budisuharto, F. Marlton, M. R. V. Jørgensen, S. Venkateshwarlu, and K. A. Beyer
Phys. Rev. B 103, 214105 – Published 4 June 2021
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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 BaTiO3BiMeO3 (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 (1x)(Ba,Ca)TiO3xBiScO3 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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  • Received 26 July 2020
  • Revised 3 December 2020
  • Accepted 19 May 2021

DOI:https://doi.org/10.1103/PhysRevB.103.214105

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. Pramanick1,*, S. Nayak1, T. Egami2, W. Dmowski2, A. Setiadi Budisuharto1, F. Marlton3,†, M. R. V. Jørgensen3,4, S. Venkateshwarlu1, and K. A. Beyer5

  • 1Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, China
  • 2Shull Wollan Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 3Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, 8000 Aarhus C, Denmark
  • 4MAX IV Laboratory, Lund University, SE-221 00 Lund, Sweden
  • 5Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois, USA

  • *apramani@cityu.edu.hk
  • Present address: School of Chemistry, University of Sydney, Australia.

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Issue

Vol. 103, Iss. 21 — 1 June 2021

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