A series of Ba1-xSrxTi1-ySnyO3(0≤x≤0.5,0≤y≤0.4) solid solutions were synthesized by low-temperature/low- pressure hydrothermal method below 150℃, 0.5MPa XRD pattern and cell parameters-composition figures of these prepared powders demonstrated that they were completely miscible solid solutions in BaTiO3. Furthermore, TEM showed that they were uniform, substantially spherical particles with an average particle size of 80nm in diameter. The sintered ceramics of those powders doped by Sr^2+ and Sn^4+ had dielectric constant ten times higher and dielectric loss six times lower than pure BaTiO3 phase at room temperature.

Key words: STANNATE, STRONTIUM COMPOUNDS, BARIUM COMPOUND, TITANATE, DOPE EFFECT, DIELECTRIC PROPERTY, HYDRO- THERMAL METHOD, NANOPHASE MATERIALS