Abstract: The changing relationship between additive amount of V2O5 and the sintered properties, dielectric properties of 6ST-4LA microwave dielectric ceramics which prepared by conventional solid-state route were investigated.The results show that small addition of V2O5 does not change the crystal phase of 6ST-4LA ceramics, the main phase of samples is SrTiO3-based solid solution.Moderate addition of V2O5 could not only dramatically lower the sintering temperature which dropped to 1450 ℃, but also increase the dielectric constant and the Quality factor(Q·f), and adjust the τf.The second phase SrVO3 appeared and increased gradually with increasing the content of V2O5.The 0.10wt; V2O5-doped 6ST-4LA ceramics sintered at 1450 ℃ have the optimal integrated microwave dielectric properties: εr=46.46 , Q·f=59219 GHz, τf=3×10-6 /℃.

Key words: The changing relationship between additive amount of V2O5 and the sintered properties, dielectric properties of 6ST-4LA microwave dielectric ceramics which prepared by conventional solid-state route were investigated.The results show that small addition of V2O5 does not change the crystal phase of 6ST-4LA ceramics, the main phase of samples is SrTiO3-based solid solution.Moderate addition of V2O5 could not only dramatically lower the sintering temperature which dropped to 1450 ℃, but also increase the dielectric constant and the Quality factor(Q·f), and adjust the τf.The second phase SrVO3 appeared and increased gradually with increasing the content of V2O5.The 0.10wt; V2O5-doped 6ST-4LA ceramics sintered at 1450 ℃ have the optimal integrated microwave dielectric properties: εr=46.46 , Q·f=59219 GHz, τf=3×10-6 /℃.