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Detailed Program
Paper Number : LP-I12
Time Frame : 15:50~16:15
Presentation Date : Friday, 28, November
Session Name : Leadfree Piezoelectrics
Session Chair 1# : Ke Wang
Session Chair 2# : Rintaro Aoyagi
Giant Electric-Field-Induced Strain and Coupling Mechanisms of Relaxor-Ferroelectric Lead-Free Ceramic Composites
Haibo Zhang
Huazhong University of Science and Technology
Keywords: Lead-free piezoceramics, Electric-Field-Induced Strain, Polarization coupling, Strain coupling Structure

A new relaxor(RE)/ferroelectric(FE) 0-3 composite lead-free piezoceramics were developed and the giant strain resulted from the electric-field-induced ergodic relaxor to ferroelectric phase transition could realize at a relatively low field of 4 kV/mm. The composite comprised of 70 vol.% 0.91Bi1/2Na1/2TiO3-0.06BaTiO3-0.03AgNbO3 RE matrix and 30 vol.% 0.93Bi1/2Na1/2TiO3- 0.07BaTiO3 FE seed shows a giant normalized d_33^* of 824 pm V-1 at room temperature(Figure 1). In order to explore the underlying mechanisms of this composite effect, two multilayer ceramics with alternating RE and FE layers were also prepared, one with the layers parallel (PCM, polarization coupled multilayer) and the other with the layers perpendicular (SCM, strain coupled multilayer) to the electroded surfaces. It was found that additional to the polarization coupling the strain coupling also plays an equally critical role in the reduction of electric field required for RE to FE phase transition.
Acknowledgements : Helpful discussions with Claudia Groh Dr. Kyle Webber*, and Professor Jürgen Rödel were gratefully acknowledged.