Effects of Mn Doping on Dielectric Properties of BSTN Ceramics

The effects of Mn doping on the phase composition and dielectric properties of (1-x)BaO center dot xSrO center dot 0.7TiO(2)center dot 0.3Nb(2)O(5) (BSTN) composite ceramics was investigated. The results showed that the dielectric constants of 0.7BaO center dot 0.3SrO center dot(0.7-z)TiO2 center dot 0.3Nb(2)O(5)center dot zMnO(2) (BSTNM) composite ceramics basically decreases as the content of doped MnO2 increases at the same applied frequency, while tan delta decreases when value z <= 0.01 but increases when value z>0.01. The phase transition temperature of tungsten bronze phase in BSTNM composite ceramics increases with the increase of value z.