Preparation and Electrical Properties of Doped Barium Titanate Based Ceramics
Li-Al(LA)doped Ba1-x(LA)x(Ti0.91Sn0.09)O3-0.6％MnO2 ceramics were prepared by the solid-state synthesis method.The effects of LA doping on the phase composition,relative density,grain size,dielectric properties and piezoelectric properties of BaTiSnO3-based ceramics were studied.The results show that LA-doped barium titanate stannate based ceramics exhibit an ABO3-type perovskite structure,and the diffraction peaks of the(022)and(200)crystal planes gradually shift to the right with increasing doping amounts.With an increase in LA doping level(x)from 0 to 2.5％,the relative density of LA-doped barium titanate stannate based ceramics initially increased and then decreased,reaching a maximum value of 93.7％at x=0.5％.At the same frequency,the order of the dielectric constant of LA-doped barium titanate stannate based ceramics is:0.5％＞1.0％＞0＞1.5％＞2.0％＞2.5％,with the highest dielectric constant observed at x=0.5％.As the LA doping amount increased from 0 to 2.5％,the piezoelectric coefficient d33,planar electromechanical coupling coefficient Kp and phase angle θ max showed an increasing and then decreasing trend,reaching maximum values at x=0.5％.When x=0～1.0％,the LA-doped barium titanate stannate based ceramics demonstrate favorable piezoelectric temperature stability and a higher depolarization temperature.Therefore,the appropriate amount of LA doping for barium titanate based ceramics was found to be 0.5％.
LA dopingBarium titanate stannate based ceramicsMicrostructureDielectric propertiesPiezoelectric properties
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