Temperature stable and fatigue resistant lead-free ceramics for actuators

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Khesro, A. ; Wang, D. ; Hussain, F. ; Sinclair, D.C. ; Feteira, A. ; Reaney, I.M. (2016)

Lead-free ceramics with the composition 0.91K1/2Bi1/2TiO3-0.09(0.82BiFeO3-0.15NdFeO3-0.03Nd2/3TiO3) were prepared using a conventional solid state, mixed oxide route. The ceramics exhibited a high strain of 0.16% at 6 kV mm-1, stable from room temperature to 175 °C, with a variation of <10%. The materials were fabricated into multilayer structures by co-firing with Pt internal electrodes. The prototype multilayer actuator exhibited constant strains up to 300 °C with a variation of ∼15%. The composition showed fatigue resistant behaviour in both monolithic and multilayer form after bipolar loading of 106 cycles.
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