摘要
采用固相合成法制备了(1–x)Ba4Sm9.33Ti18O54–xCa0.61Nd0.26TiO3[(1–x)BST–xCNT]系微波介质陶瓷。探讨了组成、烧结温度对微波介质陶瓷结构、介电性能的影响。x<0.6时,(1–x)BST–xCNT陶瓷为正交结构的新型钨青铜单相。x≥0.6时,相继出现了第二相Sm2Ti2O7和钙钛矿相,最终形成钙钛矿单相。微波介质陶瓷的介电常数ε随x的增大持续升高,品质因子Qf值则先增大后迅速减小再急剧增大。1325～1350℃烧结样品的微波介电性能达到最佳:x=0时,ε=75,Qf=8985GHz,谐振频率温度系数τf=–8.2×10–6/℃;x=0.2时,ε=75,Qf=9552GHz,τf=–14.4×10–6/℃;x=1时,ε=108.9,Qf=14919GHz,τf=236.2×10–6/℃。
Microwave dielectric ceramics of （1-x）Ba4Sm9.33Ti18O54-xCa0.61Nd0.26TiO3[（1-x）BST-xCNT] were prepared by solid state reaction. Effects of composition and sintering temperature on their crystal structure and microwave dielectric properties were investigated. A single new tungsten bronze phase was observed in the （1-x）BST-xCNT ceramics when x〈0.6. A secondary phase appeared and was transformed from Sm2Zi2O7 to a perovskite phase when x≥0.6; and a single perovskite phase was formed eventually. The dielectric constant ε increased steadily with increasing x-value, but the quality factor Qf value increased first, and decreased rapidly and then increased sharply. Optimal dielectric properties were obtained for the samples sintered at 1 325-1 350 ℃ ：ε= 75, Qf=8 985 GHz, temperature coefficient of resonant frequency τf= -8.2×10^-6/℃ for x = 0;ε=75, Qf=9 552 GHz, τf= -14.4×10^-6/℃ for x=0.2; ε=108.9, Qf=14 919 GHz, τf= 236.2×10^-6/℃ for x=1.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2006年第12期1437-1441,共5页
Journal of The Chinese Ceramic Society
基金
福建省青年科技人才创新基金(2005J012)
福州大学人才基金(XJY–0413)
关键词
微波介质陶瓷
新型钨青铜
钙钛矿
微波介电性能
microwave dielectric ceramics
new tungsten bronze
perovskites
microwave dielectric properties
