Preparation and microwave dielectric properties of Bi2Ti4O11 ceramics
Preparation and microwave dielectric properties of Bi2Ti4O11 ceramics
复制标题
Bi2Ti4O11陶瓷的制备及其微波介电性能
DOI：
10.1007/s10854-013-1234-y
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发表时间：
2013-04
期刊：
影响因子：
--
通讯作者：
Cao, Jiangli
中科院分区：
文献类型：
--
作者：
Zhang, Yingchun;Hong, Ming;Jiang, Fan;Cao, Jiangli
采用传统固相法控制反应时间合成了单相Bi2Ti4O11陶瓷，属于亚稳定相化合物。采用X射线衍射仪研究了热处理时间对Bi2Ti4O11陶瓷粉末和烧结陶瓷相组成的影响。当热处理时间小于4h时，出现了第二相Bi2Ti2O7，而在1000℃下延长热处理时间至6h，可以得到纯净的Bi2Ti4O11粉末。结果表明，在1,075~1,175℃下烧结的陶瓷为单相的Bi2Ti4O11，并呈现两种不同尺寸的棱柱状颗粒。随着烧结温度的升高，较小尺寸的晶体逐渐长大。在1,125℃下烧结的陶瓷达到最大密度，其微波介电性能为εr_(？)=0.51.2，Q_(10)×_f=0.3,050 GHz，−为297ppm/°C。
Single phase of Bi2Ti4O11 ceramics, which belong to meta-stable phase compounds, were synthesized by controlling the reaction time through conventional solid-state method. The effects of annealing time on phase composition of Bi2Ti4O11 ceramic powders and sintered ceramics were studied by XRD analysis. Second phase Bi2Ti2O7 appeared when the annealing time shorter than 4 h. However, pure phase of Bi2Ti4O11 powders can be formed by prolonging the annealing time to 6 h at 1,000 °C. The sintering temperatures on microstructure and microwave dielectric properties of Bi2Ti4O11 ceramics were investigated. The results show that ceramics sintered at 1,075–1,175 °C are single phase of Bi2Ti4O11 and present two different sizes of prismatic shape grains. Smaller size crystals grow into larger ones with increasing sintering temperature. The ceramics sintered at 1,125 °C reach a maximum density and have a microwave dielectric properties of εr = 51.2, Q × f = 3,050 GHz and τf = −297 ppm/°C.
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