Study on Ferroelectric and Dielectric Properties of Ta-Doped Lanthanum Titanate Ceramics

La2Ti2-xTaxO7(x=0.0,0.1,0.2,0.3) ceramic were prepared by conventional solid state reaction method.The crystal structure,surface morphology,ferroelectric and dielectric properties of La2Ti2-xTaxO7 ceramics have been investigated.The experimental results indicate that the substitution of Ta5+ for Ti4+ at B site to form La2Ti2-xTaxO7 solid solution can significantly enhance the ferroelectric and dielectric properties of La2Ti2O7 ceramics.At x=0.2%,ferroelectric and dielectric properties of La2Ti2-xTaxO7 ceramics reach the maximum values(Pr=0.3 μC/cm2,er=5 600).Dielectric properties of La2Ti2-xTaxO7 ceramics are stable in the high-frequency.