Enhancement of densification and microwave dielectric properties in LiF ceramics via a cold sintering and post-annealing process

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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. [Article]

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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.
More Information
Official URL:
https://www.sciencedirect.com/science/article/abs/...
Uncontrolled Keywords:
Materials; 0912 Materials Engineering

Identifiers

Identification Number:
10.1016/j.jeurceramsoc.2020.09.073
ORCID for Bing Liu: ORCID iD orcid.org/0000-0002-5637-4373
ORCID for Kai Xin Song: ORCID iD orcid.org/0000-0002-4622-1234
ORCID for Zhilun Lu: ORCID iD orcid.org/0000-0002-9967-5221
ORCID for Ge Wang: ORCID iD orcid.org/0000-0003-1842-8067
ORCID for Dawei Wang: ORCID iD orcid.org/0000-0001-6957-2494
ORCID for Di Zhou: ORCID iD orcid.org/0000-0001-7411-4658
ORCID for Antonio Feteira: ORCID iD orcid.org/0000-0001-8151-7009

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Item Type:
Article
SWORD Depositor:
Symplectic Elements
Depositing User:
Symplectic Elements
Date Deposited:
21 Oct 2020 12:23
Last Modified:
18 Dec 2024 21:05
Date of first compliant deposit:
21 October 2020
Date of first compliant Open Access:
4 October 2021
Version of first compliant deposit:
Author Accepted Manuscript
URI:
https://shura.shu.ac.uk/id/eprint/27485
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