摘要
采用传统固相法制备Ba(Co1/3Nb2/3)O3微波介质陶瓷。研究了预烧温度对其物相组成、显微结构、烧结性能、微波介电性能的影响。结果表明:在不同预烧温度下制备的陶瓷样品主晶相为复合钙钛矿结构的Ba3CoNb2O9,900℃、1000℃有微量Ba3Nb5O15生成。最佳预烧温度为1100℃,在1380℃烧结4 h时,εr=31.8,Q×f=60164GHz,τf=-15×10-6/℃。合适的预烧温度能有效抑制第二相的生成,提升材料致密度,促使主晶相B位有序排列,进而降低介电损耗。
Ba（Co1/3Nb2/3）O3 microwave dielectric ceramics were prepared by conventional solid-state method.The effects of pre-calcined temperatures on the phase composition,microstructure,sintering property and microwave dielectric property were studied.The results showed that the main crystal phase of the ceramics under the different pre-calcined temperatures was Ba3CoNb2O9 with complex perovskite structure,but small amount of Ba3Nb5O15 appeared when the pre-calcined temperature was 900 ℃ and 1000 ℃.The optimal microwave dielectric properties were obtained with εr of 31.8,Q×f of 60164 GHz and τf of-15 ×10-6/℃ when the pre-calcined temperature was 1100 ℃ and the sintering temperature was 1380 ℃ for 4 h.The optimized pre-calcined temperature prevented the formation of the second phase,which improved the compactness of the material and made the atoms of B site in the main crystal phase be well ordered and further reduced dielectric loss.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2012年第6期1670-1674,1679,共6页
Journal of Synthetic Crystals
基金
江苏省普通高校研究生科研创新计划(CXLX11_0358)
江苏高校优势学科建设工程资助项目
广东省科技计划项目(广东省战略性新兴产业核心技术攻关)(2011A091103002)
关键词
预烧温度
有序参数
介电损耗
复合钙钛矿
pre-calcined temperature
order parameter
dielectric loss
complex perovskite
