The effect of Sn^4+(BaSnO3)B-site substitution on the microstructure and dielectric properties of Ba(Mg1/3Ta2/3)O3 microwave ceramics was investigated.X-ray diffraction shows that a complex perovskite material Ba(Mg1/...The effect of Sn^4+(BaSnO3)B-site substitution on the microstructure and dielectric properties of Ba(Mg1/3Ta2/3)O3 microwave ceramics was investigated.X-ray diffraction shows that a complex perovskite material Ba(Mg1/3Ta2/3)O3 was prepared.As Sn^4+content x increases in the(1-x)Ba(Mg1/3Ta2/3)O3-xBaSnO3(x=0.00~0.20)system,the dielectric constant generally keeps unchanged,while TCF changes from positive to negative.Although the addition of Sn^4+reduces the ordering degree,Q f0 is still increased when the ceramics density increases.This trend implies that Q f0 of this system is mostly determined by ceramics density rather than ordering degree.After sintering at 1500℃for 3 h,the system with x=0.15 was found to have excellent dielectric properties as follows:ε≈25,Q f0≥300,000 GHz at 7 GHz,TCF=-0.6×10^-6/℃.展开更多
基金supported by the National High Technology Research&Development Program of China(863 Program)under grant No.2001AA325110.
文摘The effect of Sn^4+(BaSnO3)B-site substitution on the microstructure and dielectric properties of Ba(Mg1/3Ta2/3)O3 microwave ceramics was investigated.X-ray diffraction shows that a complex perovskite material Ba(Mg1/3Ta2/3)O3 was prepared.As Sn^4+content x increases in the(1-x)Ba(Mg1/3Ta2/3)O3-xBaSnO3(x=0.00~0.20)system,the dielectric constant generally keeps unchanged,while TCF changes from positive to negative.Although the addition of Sn^4+reduces the ordering degree,Q f0 is still increased when the ceramics density increases.This trend implies that Q f0 of this system is mostly determined by ceramics density rather than ordering degree.After sintering at 1500℃for 3 h,the system with x=0.15 was found to have excellent dielectric properties as follows:ε≈25,Q f0≥300,000 GHz at 7 GHz,TCF=-0.6×10^-6/℃.
