Effects of ZnO–B2O3 addition on sintering behaviors and microwave dielectric properties of Ba4Sm9.33Ti18O54 ceramics
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Effects of ZnO–B2O3 (ZB) addition on the densification, phase evolution and microwaves dielectric properties of Ba4Sm9.33Ti18O54 (BST) ceramics for low-temperature fired applications have been investigated. The sintering temperature of BST ceramics can be effectively lowered to about 1000°C with introduction of ZB. Tungsten bronze like single phase is observed in the BST ceramics with 0.5 and 1.0% ZB. However, Sm2Ti2O7 secondary phase appears when ZB addition reaches 2%, and Sm2Ti2O7 phase gradually increases with the increase ZB addition. Microwave dielectric properties of the present ceramics are strongly dependent on phase constitution and density. Optimal microwave dielectric properties of ε = 63.4, Qf = 2830 GHz, τ f =–8.8 ppm/°C is obtained for BST ceramics with 1% ZB addition.
Keywordslow temperature sintering Ba4Sm9.33Ti18O54 microwave dielectric properties ZnO–B2O3
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