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Title: Cold-sintered temperature stable Na0.5Bi0.5MoO4−Li2MoO4 microwave composite ceramics
Authors: Wang, Dawei
Zhou, Di
Zhang, Shiyu
Vardaxoglou, J.C.
Whittow, W.G.
Cadman, Darren A.
Reaney, Ian M.
Keywords: Cold sintering
Microwave dielectric
Issue Date: 2018
Publisher: © American Chemical Society (ACS)
Citation: WANG, D. ... et al., 2018. Cold-sintered temperature stable Na0.5Bi0.5MoO4−Li2MoO4 microwave composite ceramics. ACS Sustainable Chemistry and Engineering, 6 (2), pp. 2438-2444.
Abstract: A cold sintering process (150 °C, 30 min and 200 MPa) was employed to fabricate Na0.5Bi0.5MoO4−Li2MoO4 (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 (εr) 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 εr ∼ 17.4 and Q × f ∼7470 GHz. Functionally graded ceramics were also fabricated with 5 ≤ εr ≤ 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 εr facilitated by the NBMO-LMO system, which suggested a 78% aperture efficiency at 34 GHz.
Description: This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes. Details of the licence are available here: http://pubs.acs.org/page/policy/authorchoice_termsofuse.html
Sponsor: This work was supported by the Synthesizing 3D Metamaterials for RF, Microwave and THz Applications EPSRC (EP/N010493/1) and Sustainability and Substitution of Functional Materials and Devices EPSRC (EP/L017563/1) grants.
Version: Published version
DOI: 10.1021/acssuschemeng.7b03889
URI: https://dspace.lboro.ac.uk/2134/28035
Publisher Link: https://doi.org/10.1021/acssuschemeng.7b03889
ISSN: 2168-0485
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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