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Unipolar E-field dependent strain curves measured along (a)  and (b)  under 20 kV/cm at various temperatures for NBT-5.6%BT. The inset of (a) shows the temperature dependence of the dielectric constant εr and loss factor tanδ for NBT-5.6%BT measured at frequencies of 5kHz, 50kHz, and 500 kHz.
ω-2θ maps taken along the (002)PC and (111)PC zones at 130 °C: [(a) and (b)] under zero E, [(c) and (d)] under E//PC = 10 kV/cm, and [(e) and (f)] under E//PC = 4 kV/cm.
Electric field dependent d spacing of (200) for NBT-5.6%BT at 130 °C under (a) E//, and (b) E//.
The comparison of εmax/Emax for NBT-5.6%BT crystals with previously reported data for KNN-modified NBT-6%BT ceramics.
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