Li4Mg3Ti2O9: A novel low-loss microwave dielectric ceramic for LTCC applications |
| |
| Affiliation: | 1. School of Materials Science and Engineering, University of Jinan, Jinan, 250022, China;2. Department of Materials Engineering, Kyonggi University, Suwon, 443-760, Republic of Korea;1. National Engineering Center of Electromagnetic Radiation Control Materials, University of Electronic Science and Technology of China, Jianshe Road, Chengdu 610054, PR China;2. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Jianshe Road, Chengdu 610054, PR China;1. State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China;2. College of Communication Engineering, Chengdu University of Information Technology, Chengdu 610054, China;3. College of Horticulture, Anhui Agricultural University, Hefei 230036, China |
| |
| Abstract: | Low-loss novel Li4Mg3Ti2O9 dielectric ceramics with rock-salt structure were prepared by a conventional solid-state route. The crystalline structure, chemical bond properties, infrared spectroscopy and microwave dielectric properties of the abovementioned system were initially investigated. It could be concluded from this work that the extrinsic factors such as sintering temperatures and grain sizes significantly affected the dielectric properties of Li4Mg3Ti2O9 at lower sintering temperatures, while the intrinsic factors like bond ionicity and lattice energy played a dominant role when the ceramics were densified at 1450 °C. In order to explore the origin of intrinsic characteristics, complex dielectric constants (ε’ and ε’’) were calculated by the infrared spectra, which indicated that the absorptions of phonon oscillation predominantly effected the polarization of the ceramics. The Li4Mg3Ti2O9 ceramics sintered at 1450 °C exhibited excellent properties of εr=15.97, Q·f=135,800 GHz and τf=?7.06 ppm/°C. In addition, certain amounts of lithium fluoride (LiF) were added to lower the sintering temperatures of matrix. The Li4Mg3Ti2O9?3 wt% LiF ceramics sintered at 900 °C possessed suitable dielectric properties of εr=15.17, Q·f =42,800 GHz and τf=?11.30 ppm/°C, which made such materials promising for low temperature co-fired ceramic applications (LTCC). |
| |
| Keywords: | Microwave dielectric properties Infrared spectroscopy LTCC |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
