掺杂La2O3对Ba0.92Sr0.08Ti0.9Sn0.1O3系介质瓷性能的影响

La2O3-doped Ba0.92Sr0.08Ti0.9Sn0.1O3 (BSTS) dielectric ceramics were prepared by conventional solid state ceramic route. SEM was employed to observe the surface morphologies. The capacitance C and dielectric loss factor D of the samples were measured with automatic LCR meter 4225 at 1KHz respectively. The results show that: relative dielectric constant of the samples decreases, and dielectric loss first decreases then increases with increasing amount of doped La2O3. Relative dielectric constant reaches better value, dielectric loss obtains the minimum value at 0.6mol.% La2O3. Relative dielectric constant increases and dielectric loss decreases when sintering temperature increases. The samples doped with 0.6mol.% La2O3 sintered at 1340℃ for 2 hours exhibited attractive properties, including high relative dielectric constant (>3800), low dielectric loss (20×10-4), low temperature coefficient of relative dielectric constant(<±26%) in the temperature range of +25℃ to +85℃.