A series of nano-Ba_1－xSr_xTiO₃ (0≤x≤1.0) solid solutions were synthesized by solid-state reaction at room temperature. XRD and d-spacing-component figures of the solid solution powder demonstrated that the compounds were mutually miscible in the solid solutions, and TEM showed that they were uniform and substantially spherical particles with an average size of 40 nm in diameter. The remarkable advantages of the method are high yields, solvent-free, and environmental benign. The results of preparing ceramics showed that after adulterating with Sr^2＋ in pure BaTiO₃ phase, the dielectric constant obviously increased and dielectric loss reduced at normal temperature. Furthermore, we also discussed the micro-structure of the BaTiO₃ ceramics at different sintering temperatures, then found that the sintering temperature was nearly 100～150 ℃ lower than that of the traditional micro-powder.

Key words: room-temperature solid-state reaction, chemical adulteration, BaTiO₃ nano-material, dielectric property