摘要
研究了PbTiO3和Bi2Ti2O7复合掺杂对新型的具有中介电常数的Y2O3-2TiO2系微波介质陶瓷物相组成、介电性能和烧结温度的影响。结果表明,掺杂后的陶瓷材料主晶相仍为A2B2O7型烧绿石结构,未发现第二相,Bi3+和Pb2+共同占据Y3+所在的A位。Pb/Bi复合掺杂有效降低了陶瓷的烧结温度,当w(PbTiO3)=2%和w(Bi2Ti2O7)=8%时,烧结温度降低为1 260℃,且陶瓷具有较好的介电性能,即介电常数rε≈64,介质损耗tanδ≈3.6×10-3,品质因数与频率的乘积Q×f≈2 438 GHz。
Effects of Bi2Ti2O7 and PbTiO3 co-doping on the microstructures,dielectric properties and sintering temperature of Y2O3-2TiO2 based microwave dielectric ceramics were studied.The results showed that a pure and single-phase material could be obtained and the main phase exhibited a pyrochlore structure.Bi3＋ and Pb2＋ were incorporated into the A site of Y3＋ of pyrochlore structure.The sintering temperature was effectively reduced by the Pb/Bi co-doping.As the based ceramics doped with 2% of PbTiO3 and 8% of Bi2Ti2O7,the sintering temperature was reduced to 1 260 ℃,and good microwave dielectric properties of εr=64,tan δ=3.6×10-3 and Q×f=2 438 GHz have been obtained.
出处
《压电与声光》
CSCD
北大核心
2011年第1期139-142,共4页
Piezoelectrics & Acoustooptics
基金
江苏省高校自然科学研究重点基金资助项目(08KJA430002)
关键词
微波介质陶瓷
烧绿石结构
PBTIO3
介电性能
烧结温度
microwave dielectric ceramics
pyrochlore structure
lead titanate
dielectric properties
sintering temperature
