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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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Effect of poling temperature on piezoelectricity of CaZrO3-modified (K, Na)NbO3-based lead-free ceramics

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Title
Effect of poling temperature on piezoelectricity of CaZrO3-modified (K, Na)NbO3-based lead-free ceramics
Author
Yao, Fang-ZhouWang, KeJo, WookLee, Jae-ShinLi, Jing-Feng
Issue Date
2014-09
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.116, no.11, pp.114102
Abstract
Electrical poling is indispensable for endowing isotropic ferroelectric polycrystals with a net macroscopic polarization and hence piezoelectricity. However, little attention has been paid to the optimization of poling conditions in (K, Na)NbO3-based ceramics with a polymorphic phase transition. This study investigated the electrical properties of CaZrO3-modified (K, Na, Li)(Nb, Ta)O3lead-free piezoceramics as a function of the poling temperature. Peak piezoelectric coefficient d33of 352 ± 7 pC/N and planar electromechanical coupling factor kpof 0.47 were obtained at the optimized poling temperature of 120°C, which crosses the polymorphic phase transition regime. In-depth analysis of the asymmetric polarization hysteresis loops and bipolar strain curves uncovered striking analogy between electrical poling and unipolar cycling in the current system, which is attributed to a competition between domain reorientation and space charge accumulation.
URI
https://scholarworks.unist.ac.kr/handle/201301/7021
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84907185171
DOI
10.1063/1.4895774
ISSN
0021-8979
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