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Title: Nanoscale mapping of heterogeneity of the polarization reversal in lead-free relaxor–ferroelectric ceramic composites

Journal Article · · Nanoscale
DOI:https://doi.org/10.1039/c5nr05032d· OSTI ID:1261507
 [1];  [1];  [2];  [2];  [2];  [2];  [3];  [3];  [1]
  1. Univ. of Duisburg, Essen (Germany)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Technical Univ. of Darmstadt (Germany)

Relaxor/ferroelectric ceramic/ceramic composites have shown to be promising in generating large electromechanical strain at moderate electric fields. However, the mechanisms of polarization and strain coupling between grains of different nature in the composites remain unclear. To rationalize the coupling mechanisms we performed advanced piezoresponse force microscopy (PFM) studies of 0.92BNT-0.06BT-0.02KNN/0.93BNT-0.07BT (ergodic/non-ergodic relaxor) composites. PFM is able to distinguish grains of different phases by characteristic domain patterns. Polarization switching has been probed locally, on a sub-grain scale. k-Means clustering analysis applied to arrays of local hysteresis loops reveals variations of polarization switching characteristics between the ergodic and non-ergodic relaxor grains. Here, we report a different set of switching parameters for grains in the composites as opposed to the pure phase samples. These results confirm ceramic/ceramic composites to be a viable approach to tailor the piezoelectric properties and optimize the macroscopic electromechanical characteristics.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE; European Commission (EC)
Grant/Contract Number:
AC05-00OR22725; 290158
OSTI ID:
1261507
Journal Information:
Nanoscale, Vol. 8, Issue 4; ISSN 2040-3364
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (5)

Tailoring the strain performance of lead-free relaxor/ferroelectric-layered composites journal January 2020
Switching properties of epitaxial La 0.5 Sr 0.5 CoO 3 /Na 0.5 Bi 0.5 TiO 3 /La 0.5 Sr 0.5 CoO 3 ferroelectric capacitor journal January 2018
Electrostatic contribution to hysteresis loop in piezoresponse force microscopy journal April 2019
Investigations of ferroelectric polycrystalline bulks and thick films using piezoresponse force microscopy journal March 2019
Structure and Electrical Properties of Na0.5Bi0.5TiO3 Epitaxial Films with (110) Orientation journal October 2019

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