低温烧结(Zr_(0.8)Sn_(0.2))TiO_4陶瓷的晶相组成与微波介电性能  

Phase Composition and Microwave Dielectric Properties of Low Firing (Zn_(0.8)Sn_(0.2))TiO_4 Ceramics

作　　者：王依琳[1] 赵梅瑜[1] 吴文骏[1] 李蔚[1] 

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050

出　　处：《无机材料学报》2005年第3期613-617,共5页Journal of Inorganic Materials

摘　　要：讨论了低温烧结(Zr0.8Sn0.2)TiO4微波介质陶瓷的晶相组成与制备工艺、掺杂离子的关系,结果表明:粉体的合成温度对烧结体的晶相构成有很大的影响,进而影响材料的谐振频率温度系数竹,稍高的合成温度有利于提高α-PbO型ZST相的稳定性,使谐振频率温度系数τf由107 ppm/℃降至20.88 ppm/℃.采用Nb5+离子掺杂能更有效地抑制烧结过程中游离氧化物相的析出,当Nb5+达到0.15mol%时,920℃烧结样品的介电常数为25,谐振频率温度系数τf为-2.44 ppm/℃,品质因数Q·f达4868GHz(5GHz).The effects of the preparing process and the doping ions on the phase composition of low firing (Zn0.8Sn0.2)TiO4 ceramics were studied. The experimental results indicate that the phase composition of the ceramics is dependent on the calcining temperature of ZST powder, and it will affect tau(f), the temperature coefficient of resonant frequencies. Higher calcining temperature for the powders is favorable to increase the stability of alpha-PbO type ZST phase for decreasing the temperature coefficient. It is more useful to restrain the separation of oxides by doping with Nb5+. Dielectric constant epsilon, temperature coefficient tau(f) and Q center dot f of the samples doped with 0.15mol% Nb5+ sintered at 920 degrees C are 25, -2.44 ppm/degrees C and 4868(5GHz).

关 键 词：低温烧结 晶相组成 微波介质 

分 类 号：TQ174[化学工程—陶瓷工业]