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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：2054 下载量：501
| 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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