LIU, Bing, LI, Lei, SONG, Kai Xin, MAO, Min Min, LU, Zhilun, WANG, Ge, LI, Linhao, WANG, Dawei, ZHOU, Di, FETEIRA, Antonio and REANEY, Ian M (2020). Enhancement of densification and microwave dielectric properties in LiF ceramics via a cold sintering and post-annealing process. Journal of the European Ceramic Society.
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Abstract
LiF is a low-firing fluoride with excellent microwave dielectric properties, however densification of LiF ceramics is challenging owing to their low surface free energy. In this study, a cold sintering process (150 °C, 250 MPa, 60 min) was employed to pre-densify LiF ceramics to 78 % relative density. Post-annealing treatments between 650 °C and 800 °C led to significant grain growth which was accompanied by an increase in relative density to 92 %. The microwave quality factor (Qf) increased with increasing annealing temperature to a maximum of 110,800 GHz at 800 °C, 1.5 times higher than the value obtained via conventional sintering (78,800 GHz), with relative permittivity εr = 8.2 and temperature coefficient of resonant frequency, τf =–135 ppm/°C. Such high values of Qf and its compatibility with Ag electrode suggest that cold sintered LiF has great potential as a component or additive in low temperature co-fired ceramic formulations.
Item Type: | Article |
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Uncontrolled Keywords: | Materials; 0912 Materials Engineering |
Identification Number: | https://doi.org/10.1016/j.jeurceramsoc.2020.09.073 |
SWORD Depositor: | Symplectic Elements |
Depositing User: | Symplectic Elements |
Date Deposited: | 21 Oct 2020 12:23 |
Last Modified: | 04 Oct 2021 01:18 |
URI: | https://shura.shu.ac.uk/id/eprint/27485 |
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