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(a) Comparison of the temperature dependences of d33 for various representative KNN-based ceramics. (b) Temperature-dependent neutron diffraction intensity mapping of the 002pc reflection of the x = 0, y = 0 and x = 0.025, y = 0.025 samples. (c) Out-of-plane PFM amplitudes of the x = 0.025, y = 0.025 sample in the virgin state and local poling state at 25°C and 100°C.
