Abstract
Lead-free Bi0.5Na0.5TiO3 piezoelectric ceramics were successfully prepared by reactive flash sintering of Bi2O3-NaCO3-TiO2 mixed powders, where phase transformation and densification occurred simultaneously. The influence of electric field strength, current density and holding time at constant current state on the phase transformation and densification were investigated. The current density had a significant influence on the extent of phase transformation and densification. The holding time had no influence on the phase transformation, but had an important effect on crystallinity of sample. The sintered bulks exhibited the maximum polarization Pm of 16.8 μC/cm2, remanent polarization Pr of 9.6 μC/cm2, coercive field Ec of 29 kV/cmm, maximum electric-field-induced strain of 0.053 %, and piezoelectric coefficient d33 of 85 pC/N. The reactive flash sintering can prepare the dense and single-phase ceramics from multiphase precursor powders in one step of flash, providing a new way for rapid production of ceramic materials.
Published Version
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