Synthesis,structure and dielectric properties of Ba_1-xSr_xM_yTi_1-yO₃ （M=Zr,Sn）

摘要

A series of Ba1-xSrxMyTi1-yO3 (M = Zr, Sn, 0≤x≤0.4, 0≤y≤0.3) solid solutions were synthesized with the soft chemical method below 100 ℃. XRD pattern and cell parameters-composition figures of the prepared powder demonstrate that they are completely miscible solid solutions based on BaTiO3. Furthermore, TEM shows that they have a shape of uniform, substantially spherical particles with an average particle size of 70 nm in diameter. The sintered ceramics of the powder doped with Sr2+ and Zr4+ or Sn4+ have dielectric constant eight times higher and dielectric loss thirty per cent lower than those of pure BaTiO3 phase at room temperature.