Wang, D. orcid.org/0000-0001-6957-2494, Zhou, D., Zhang, S. et al. (4 more authors) (2018) Cold-sintered temperature stable Na0.5Bi0.5MoO4–Li2MoO4 microwave composite ceramics. ACS Sustainable Chemistry and Engineering, 6 (2). pp. 2438-2444.
Abstract
© 2017 American Chemical Society. A cold sintering process (150 °C, 30 min and 200 MPa) was employed to fabricate Na 0.5 Bi 0.5 MoO 4 -Li 2 MoO 4 (NBMO-LMO) composites with up to 96.4% relative density. X-ray diffraction traces, backscattered electron images and Raman spectra indicated the coexistence of NBMO and LMO phases in all composites with no detectable secondary phases. The pemittivity (ϵ r ) and temperature coefficient of resonant frequency (TCF) decreased, whereas microwave quality factor (Q × f) increased, with increasing weight % LMO. Near-zero TCF was obtained for NBMO-20 wt %LMO with ϵ r ∼ 17.4 and Q × f ∼ 7470 GHz. Functionally graded ceramics were also fabricated with 5 ≤ ϵ r ≤ 24. To illustrate the potential of these cold sintered composites to create new substrates and device architecture, a dielectric graded radial index lens was designed and simulated based on the range of ϵ r facilitated by the NBMO-LMO system, which suggested a 78% aperture efficiency at 34 GHz.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 American Chemical Society. ACS AuthorChoice - This is an open access article published under an ACS AuthorChoice (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
Keywords: | Cold sintering; Li2MoO4; Microwave dielectric; Na0.5Bi0.5MoO4 |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 09 Mar 2018 16:11 |
Last Modified: | 09 Mar 2018 16:11 |
Published Version: | https://doi.org/10.1021/acssuschemeng.7b03889 |
Status: | Published |
Publisher: | American Chemical Society |
Refereed: | Yes |
Identification Number: | 10.1021/acssuschemeng.7b03889 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:128134 |