掺杂Lu_2O_3对Ba_4Sm_(9.33)Ti_(18)O_(54)微波介质陶瓷性能的影响

以Ba4Sm9.33Ti18O54微波介质陶瓷为基础,掺杂Lu2O3进行改性,形成固溶式为Ba4(Sm1–yLuy)9.33Ti18O54的结构。结果表明,掺杂Lu2O3能很好地把Ba4Sm9.33Ti18O54微波介质陶瓷的烧结温度降至1 260℃,当y=0.05时Ba4Sm9.33Ti18O54为类钨青铜结构,能得到介电性能较佳的微波介质陶瓷:4.33GHz时εr约为76,Q.f约为2532,τf为–42×10–6/℃;y<0.5时生成了类钨青铜结构晶相,y≥0.5主晶相变成烧绿石相,不具备介电性。

Effects of Lu_2O_3 doping on the performance of Ba_4Sm_(9.33)Ti_(18)O_(54) microwave dielectric ceramics

Doped Lu2O3 Ba4Sm9.33Ti18O54 microwave dielectric ceramics were studied in order to improve dielectric performance of the ceramics.The solid solution formula was Ba4(Sm1-yLuy)9.33Ti18O54.The results show that the sintering temperature of Ba4Sm9.33Ti18O54 microwave dielectric ceramics is reduced to 1 260 ℃ effectively by doping Lu2O3.When y=0.05,the major phase Ba4Sm9.33Ti18O54 was similar to tungsten bronze type structure and the dielectric performance of Ba4(Sm1-yLuy)9.33Ti18O54 microwave dielectric ceramics is more excellent: at 4.33 GHz,εr≈76,Q·f ≈2 532,τf≈-42×10-6 /℃.When y<0.5,there is BaSm2Ti4O12 phase;while y≥0.5,the main phase become pyrochlore phase and it does not behave dielectric properties.