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高能球磨法对Li3Mg2NbO6陶瓷结构及性能的影响

发表时间:2017-07-13  浏览量:73  下载量:29
全部作者: 冯琴琴,刘鹏,付志粉
作者单位: 陕西师范大学物理学与信息技术学院
摘 要: 实验通过高能球磨(high energy ball-milling)法,在烧结温度900~1 000℃范围内成功制备了Li3Mg2NbO6微波介电陶瓷。利用高能球磨法制备的Li3Mg2NbO6纳米粉体,平均晶粒尺寸为341 nm,为降低其陶瓷的烧结温度提供了前提条件;由X射线衍射(X-ray diffraction,XRD)分析可得,陶瓷在不同的烧结温度下,组分不随烧结温度的升高而变化,即除了主相Li3Mg2NbO6外还伴随有少量的Nb2O5相。在950℃烧结的Li3Mg2NbO6陶瓷密度为3.72 g/cm3,晶粒分布均匀,由于Nb2O5的存在,恶化了陶瓷的微波介电性能,其微波介电性能为εr = 16.85,Q×f = 25 400 GHz,τf =-21.96×10-6/℃. 由Li3Mg2NbO6陶瓷与银粉在950℃共烧2 h的样品粉末XRD图谱可以看出,该陶瓷与银粉没有发生化学反应,这有望成为一种微波介电性能较为优异的低温共烧陶瓷(low temperature co-fired ceramic,LTCC)材料。
关 键 词: 凝聚态物理学;高能球磨;微波介电陶瓷;低温共烧陶瓷;品质因数;谐振频率温度系数
Title: Impact of high energy ball-milling method on the structure and properties of Li3Mg2NbO6 ceramic
Author: FENG Qinqin, LIU Peng, FU Zhifen
Organization: School of Physics and Information Technology, Shaanxi Normal University
Abstract: Li3Mg2NbO6 ceramics are prepared by high energy ball-milling at 900-1 000℃ for the first time. The average grain size of Li3Mg2NbO6 nanopowders is 341 nm by high energy ball-milling, which is important to reduce the sintering temperature of ceramic. X-ray diffraction (XRD) patterns show that the components have no significant changes with increased sintering temperature, which means Li3Mg2NbO6 ceramics have a well-dense microstructure accompanying a minor of the second Nb2O5 phase. Because the existence of Nb2O5, worsens the microwave dielectric properties of the ceramics, and the density of ceramics is 3.72 g/cm3 at 950℃. Excellent microwave dielectric properties of Li3Mg2NbO6 ceramics are: εr = 16.85, Q×f = 25 400 GHz, τf =-21.96×10-6/℃. XRD patterns of Li3Mg2NbO6 ceramics co-fired with Ag at 950℃ for 2 h indicate that no chemical reaction takes place between the main phase and Ag, indicating that the low-temperature sintered ceramics are excellent materials and suitable for the low temperature co-fired ceramic (LTCC) application.
Key words: condensed matter physics; high energy ball-milling; microwave dielectric ceramics; low temperature co-fired ceramic; quality factor; temperature coefficient of the resonant frequency
发表期数: 2017年7月第13期
引用格式: 冯琴琴,刘鹏,付志粉. 高能球磨法对Li3Mg2NbO6陶瓷结构及性能的影响[J]. 中国科技论文在线精品论文,2017,10(13):1512-1518.
 
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