acssuschemeng.7b03889.pdf (4.11 MB)
Download file

Cold-sintered temperature stable Na0.5Bi0.5MoO4−Li2MoO4 microwave composite ceramics

Download (4.11 MB)
journal contribution
posted on 11.01.2018, 09:57 authored by Dawei Wang, Di Zhou, Shiyu Zhang, J. C. Vardaxoglou, William WhittowWilliam Whittow, Darren Cadman, Ian M. Reaney
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.

Funding

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.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

ACS Sustainable Chemistry and Engineering

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.

Publisher

© American Chemical Society (ACS)

Version

NA (Not Applicable or Unknown)

Acceptance date

14/12/2017

Publication date

2017-12-15

Notes

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

ISSN

2168-0485

Language

en