Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 867, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.159059
Keywords
Li4GeO4; Olivine structure; LTCC; Microwave dielectric property
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Funding
- Natural Science Foundation of China [21761008, 21965009]
- Natural Science Foundation of Guangxi Zhuang Autonomous Region [2018GXNSFAA138175]
- Open Foundation of Guangxi Key Laboratory of Optical and Electronic Materials and Devices [20AA-16, 20AA-11]
- Foundation of Guilin University of Technology [GUTQDJJ2019183]
- High level innovation team and outstanding scholar program of Guangxi Institutes and Innovation Project of Guangxi Graduate Education [YCBZ2020167, YCBZ2020066]
- China Postdoctoral Science Foundation [2020M683628XB]
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A low-permittivity and low-loss ceramic Li4GeO4 with olivine structure was fabricated via solid state reaction, showing excellent microwave properties when sintered at 720 degrees C. Its potential as a candidate material for LTCC application was demonstrated through analysis of microwave dielectric performances.
A low-permittivity and low-loss ceramic, Li4GeO4, was fabricated via solid state reaction route. XRD showed that a single orthorhombic Li4GeO4 phase with olivine structure was prepared over the sintering temperature range of 660-740 degrees C. Dense ceramic sintered at 720 degrees C revealed excellent microwave properties, with epsilon(r) similar to 6.99, Q x f similar to 47,813 GHz (at 15.5 GHz), and tau(f) similar to - 159.2 ppm/degrees C. The microwave dielectric performances were analyzed with the intrinsic characteristics of crystal structure by ionic polarizability and Raman spectra. Additionally, the Li4GeO4 ceramic showed good chemical compatibility with Ag sintered at 720 degrees C. In the low-temperature cofired ceramic (LTCC) application, aforesaid results manifested that Li4GeO4 ceramic was considered as a potential candidate. (C) 2021 Elsevier B.V. All rights reserved.
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