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Lead-free relaxor ferroelectric materials have attracted attentiondue to their field-induced phase transition and its associated strain,which is an important feature in the use of an actuator [1e6]. Bibasedferroelectric materials, BiNaTiO3eBaTiO3eKNaNBO3, BiNaKTiO3eBiAlO3,and Ta-doped BiNaKTiO3, etc. [7e16] exhibited phasetransition with high fields of more than 6e7 kV/mm. To reduce thefield to complete the phase transition, we proposed a concept of aninclusion-type composite, consisting of relaxor grains and ferroelectricgrains, showing a relatively low field-induced phase transition[12]. An example describing our concept is shown in Fig. 1.Fig. 1 shows the concept of an inclusions-embedded composite andlayered composite designed for improving the field-induced phasetransition and its associated deformation behavior. As seen in Fig. 1,as an electric field was applied, the relaxor or non-polar phase ofthe matrix is transformed into a ferroelectric phase. As aconsequence, the field-induced polarization change and strainwere observed
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