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Title: Electric-field-induced local and mesoscale structural changes in polycrystalline dielectrics and ferroelectrics

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep14678· OSTI ID:1240263
 [1];  [2];  [3];  [1]
  1. North Carolina State Univ., Raleigh, NC (United States)
  2. National Institute of Standards and Technology, Gaithersburg, MD (United States)
  3. UNSW Australia, Sydney (Australia)

In this study, the atomic-scale response of dielectrics/ferroelectrics to electric fields is central to their functionality. Here we introduce an in situ characterization method that reveals changes in the local atomic structure in polycrystalline materials under fields. The method employs atomic pair distribution functions (PDFs), determined from X-ray total scattering that depends on orientation relative to the applied field, to probe structural changes over length scales from sub-Ångstrom to several nanometres. The PDF is sensitive to local ionic displacements and their short-range order, a key uniqueness relative to other techniques. The method is applied to representative ferroelectrics, BaTiO3 and Na½Bi½TiO3, and dielectric SrTiO3. For Na½Bi½TiO3, the results reveal an abrupt field-induced monoclinic to rhombohedral phase transition, accompanied by ordering of the local Bi displacements and reorientation of the nanoscale ferroelectric domains. For BaTiO3 and SrTiO3, the local/nanoscale structural changes observed in the PDFs are dominated by piezoelectric lattice strain and ionic polarizability, respectively.

Research Organization:
North Carolina State University, Raleigh, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1240263
Journal Information:
Scientific Reports, Vol. 5; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 58 works
Citation information provided by
Web of Science

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Cited By (14)

An intermediate metastable ferroelectric state induced giant functional responses in Bi 0.5 Na 0.5 TiO 3 ceramics journal January 2019
Investigation of periodically driven systems by x-ray absorption spectroscopy using asynchronous data collection mode journal April 2018
Time filtering of event based neutron scattering data: A pathway to study the dynamic structural responses of materials journal September 2018
Time-of-flight neutron total scattering with applied electric fields: Ex situ and in situ studies of ferroelectric materials journal September 2018
Mechanisms underpinning the ultrahigh piezoelectricity in Sm-doped 0.705Pb(Mg 1/3 Nb 2/3 )O 3 -0.295PbTiO 3 : Temperature-induced metastable local structure and field-induced polarization rotation journal August 2019
Oxygen octahedral tilt ordering in (Na 1/2 Bi 1/2 )TiO 3 ferroelectric thin films journal January 2020
Electric field and temperature dependence of the local structural disorder in the lead-free ferroelectric N a 0.5 B i 0.5 Ti O 3 : An EXAFS study journal January 2016
Field-induced polarization rotation and phase transitions in 0.70 Pb ( M g 1 / 3 N b 2 / 3 ) O 3 0.30 PbTi O 3 piezoceramics observed by in situ high-energy x-ray scattering journal June 2018
A simple correction for the parallax effect in X-ray pair distribution function measurements journal September 2019
Precise implications for real-space pair distribution function modeling of effects intrinsic to modern time-of-flight neutron diffractometers journal June 2018
Current Understanding of Structure–Processing–Property Relationships in BaTiO 3 –Bi( M )O 3 Dielectrics journal September 2016
Defect mechanisms in BaTiO 3 ‐Bi M O 3 ceramics journal January 2018
Relaxor-ferroelectric transitions: Sodium bismuth titanate derivatives journal August 2018
A simple correction for the parallax effect in X-ray pair distribution function measurements text January 2019