Influence of Sm_2O_3-doping on Dielectric Properties of BZT20 Ceramics

The Ba(Zr0.2Ti0.8)O3 ceramics were prepared using BaCO3,ZrO2 and TiO2 et al as crude materials,Sm2O3 as dopant,and the dielectric properties are investigated.The morphology of the samples was observed by SEM.It was found that the Sm3+ ions tended to enter into the B-site in the perovskit lattice with the amount of the dopants increase when the amount of x(Sm2O3) was less than 0.2% and after the Sm3+ ions entered into the A-site.The amount of Sm2O3-dopant has significantly influence on the dielectric constant and the loss of the sample.When the amount of x(Sm2O3) was 0.2%,the ceramic sample had the maximum dielectric constant of about 5 600.With the amount of Sm2O3-dopant increase,the dielectric loss of the sample has been improved significantly and the minimum loss has decreased to 0.002 1.