文档介绍：Ba6-3xLa8+2xTi18O54(x=2/3)微波介质陶瓷Zr4+取代的改性研究
摘要
Ba6-3xLa8+2xTi18O54固溶体具有高介电常数、低损耗和近零温度系数,因此成为制备微波介质谐振器、滤波器的关键材料。关键词:Ba6-3xLa8+2xTi18O54 Zr4+取代微波介电性能烧结性能
实验采用高温固相反应法合成Ba6-3xLa8+2xTi18O54并利用Zr4+取代Ba6−3xLa8+2xTi18O54(x=2/3)陶瓷B位Ti4+,期望通过调整Zr4+的取代量,在保持高介电常数的基础上提高该体系陶瓷的品质因数和温度的稳定性。
对于复合体系采用XRD、SEM、EDS、微波介电测试等分析方法,研究了复合体系微波介质陶瓷材料在1300~1600 ℃下的烧结工艺、相组成、微观结构和微波介电性能。研究表明:复合体系在整个z组成范围内除了z=,都可以形成致密的陶瓷。并且z=。介电常数、品质因数与谐振频率温度系数均随着z的增大而不同程度的减小。当z=,得到最佳性能:εr=,Q×f=5875 GHz,τf =×10-6/°C。
Effects of Zr4+ substitution on microwave dielectric properties of Ba6-3xLa8+2xTi18O54(x=2/3) ceramics
Abstract
Ba6-3xLa8+2xTi18O54 solid solutions with a high dielectric constant, low dissipation and near-zero temperature coefficient, thus ing the key materials to preparat microwave dielectric resonator, filter materials. Experiment using high-temperature solid state reaction synthesis of Ba6-3xLa8+2xTi18O54 and use Zr4+ instead of Ba6 − 3xLa8+2xTi18O54 (x=2/3) ceramic b-Ti4+,expect to improve the quality factor and temperature stability of this system ceramic on the basis of keeping high dielectric constant by Zr4+ substitution.
For posite system using XRD, SEM, EDS and microwave dielectric test analysis method,plex system of microwave dielectric ceramics , sintering process , position, microstructure and microwave dielectric properties is studied under the 1300 ~1600 ℃.The research indicates that expect z is equal to , sense ceramic can be formed within the limits of the whole ponent, in posite systems. The second phase, Ba2ZrO4 appears when z is greater than . With the enlargement of z, dielectric constant, quality factor and temperature coefficient of resonance frequency decrease in a different extent. When z is equal to , we get the best property: εr =, Q×f=5875 GHz,τf =×10-6/°C.
Key Words: Ba6-3xLa8+2xTi18O54 Zr4+ substitution Microwave dielectric properties Sintering bahavior
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