Journal
APPLIED PHYSICS LETTERS
Volume 107, Issue 20, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4936165
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Funding
- Ministry of Sciences and Technology of China through National Basic Research Program of China (973 Program) [2015CB654604]
- National Natural Science Foundation of China for Creative Research Groups [51221291]
- National Natural Science Foundation of China [51272123, 51332002]
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The nonlinear dielectric response in (Na0.52K0.4425Li0.0375)(Nb0.92-xTaxSb0.08)O-3 ceramics with different amounts of Ta was measured using subcoercive electric fields and quantified by the Rayleigh model. The irreversible extrinsic contribution, mainly caused by the irreversible domain wall translation, was strongly dependent on the domain configuration. The irreversible extrinsic contributions remained approximately the same within the single-phase regions, either orthorhombic or tetragonal, due to the similar domain morphology. However, in the polymorphic phase transition region, the domain wall density was increased by minimized domain size, as observed by transmission electron microscopy. This resulted in constrained domain wall motion due to selfclamping and reduced the irreversible extrinsic contribution. (c) 2015 AIP Publishing LLC.
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