Study on Effect of Al₂O₃ Doping on Microstructure and Properties of LiNbO₃ Piezoelectric Ceramics AITranslate

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Chinese Library Classification Number:TM282[一般工业技术—材料科学与工程]

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Lithium niobate(LiNbO₃,LN)piezoelectric ceramics were prepared by vacuum hot-pressing sintering at 900℃and 35 MPa for 120 min.The effects of different Al₂O₃ doping amounts on their piezoelectric properties were studied.Through the analysis of phase,density,microstructure,piezoelectric and dielectric properties,it is found that within the range of Al₂O₃ doping amounts of 0.5%~3%(molar fraction),all LN piezoelectric ceramics samples exhibit the same position of main diffraction peaks that are sharp and indicative of a perovskite-type structure.with the increase of Al₂O₃ doping amount,the particle size of LN piezoelectric ceramics gradually decreases while the porosity increases both in size and quantity.In addition,the density and piezoelectric constant d₃₃increase at first and then decrease,reaching their maximum of 4.65 g/cm³ and 11.3 pC/N,respectively,at an Al₂O₃ doping amount of 1%.The above piezoelectric constant is 88.3%higher than that of LN piezoelectric ceramics prepared by laser sintering.At the test frequency of 1 MHz,the relative dielectric constant of LN piezoelectric ceramics increases gradually with the increase of Al₂O₃ doping amount.