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Title: Stabilization of Polar Nanoregions in Pb-free Ferroelectrics

Journal Article · · Physical Review Letters
 [1];  [2];  [2];  [1];  [3];  [3]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [4];  [5]
  1. City Univ. of Hong Kong, Kowloon Tong (Hong Kong SAR)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Oak Ridge, TN (United States)
  3. Technische Univ. Darmstadt, Darmstadt (Germany)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Aarhus Univ., Aarhus C (Denmark); Lund Univ., Lund (Sweden)

In this study, the formation of polar nanoregions through solid-solution additions is known to enhance significantly the functional properties of ferroelectric materials. Despite considerable progress in characterizing the microscopic behavior of polar nanoregions (PNR), understanding their real-space atomic structure and dynamics of their formation remains a considerable challenge. Here, using the method of dynamic pair distribution function, we provide direct insights into the role of solid-solution additions towards the stabilization of polar nanoregions in the Pb-free ferroelectric of Ba(Zr,Ti)O3. It is shown that for an optimum level of substitution of Ti by larger Zr ions, the dynamics of atomic displacements for ferroelectric polarization are slowed sufficiently below THz frequencies, which leads to increased local correlation among dipoles within PNRs. The dynamic pair distribution function technique demonstrates a unique capability to obtain insights into locally correlated atomic dynamics in disordered materials, including new Pb-free ferroelectrics, which is necessary to understand and control their functional properties.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1440833
Alternate ID(s):
OSTI ID: 1437680
Journal Information:
Physical Review Letters, Vol. 120, Issue 20; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 41 works
Citation information provided by
Web of Science

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Cited By (5)

Broad-temperature-span and large electrocaloric effect in lead-free ceramics utilizing successive and metastable phase transitions journal January 2019
A simple correction for the parallax effect in X-ray pair distribution function measurements journal September 2019
Ferroelectric characteristics of Fe/Nb co-doped BaTiO 3 journal August 2019
Real-Space Description of Dynamics of Liquids journal October 2018
A simple correction for the parallax effect in X-ray pair distribution function measurements text January 2019

Figures / Tables (3)


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