反应烧结法制备Mg4 Nb2 O9陶瓷及其微波介电性能的表征

摘要

采用反应烧结法制备Mg4 Nb2 O9陶瓷，省去预烧阶段，优化了制备工艺，研究得到Mg4 Nb2 O9陶瓷样品的相组成、微观形貌以及微波介电性能随着烧结温度的变化关系．由 XRD检测到陶瓷在1200～1450℃均得到纯相的Mg4Nb2O9陶瓷，在1400℃烧结保温3 h所得陶瓷密度为4．13 g/cm3（相对密度94．25％），样品具有清晰的微观形貌，微波介电性能为：εr＝12．1，Q×f＝169000 GHz，τf＝-55．55×10-6℃-1．%The Mg4 Nb2 O9 ceramics were sintered by reaction-sintering process,without any calci-nation.Such process was simple and can reduce the loss of raw material.The phase composi-tions,microstructures and microwave dielectric properties of Mg4 Nb2 O9 ceramics were investiga-ted.The Mg4Nb2O9ceramics sintered at 1 200~1 450 ℃ gained single phase.The Mg4Nb2O9ce-ramics sintered at 1 400 ℃ for 3 h exhibited density of 4.13 g/cm3 ,clear microstructures,and bet-ter microwave dielectric properties ofεr= 12.1,Q× f= 169 000 GHz andτf=- 55.55 ×10-6℃-1 .