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Temperature stable cold sintered (Bi0.95Li0.05)(V0.9Mo0.1)O4-Na2Mo2O7 microwave dielectric composites

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posted on 30.04.2019, 08:28 authored by Dawei Wang, Shiyu Zhang, Di Zhou, Kaixin Song, Antonio Feteira, J. C. Vardaxoglou, William WhittowWilliam Whittow, Darren Cadman, Ian M. Reaney
Dense (Bi0.95Li0.05)(V0.9Mo0.1)O4-Na2Mo2O7 (100−x) wt.% (Bi0.95Li0.05)(V0.9Mo0.1)O4 (BLVMO)-x wt.% Na2Mo2O7 (NMO) composite ceramics were successfully fabricated through cold sintering at 150 °C under at 200 MPa for 30 min. X-ray diffraction, back-scattered scanning electron microscopy, and Raman spectroscopy not only corroborated the coexistence of BLVMO and NMO phases in all samples, but also the absence of parasitic phases and interdiffusion. With increasing NMO concentration, the relative pemittivity (εr) and the Temperature Coefficient of resonant Frequency (TCF) decreased, whereas the Microwave Quality Factor (Qf) increased. Near-zero TCF was measured for BLVMO-20wt.%NMO composites which exhibited εr ~ 40 and Qf ~ 4000 GHz. Finally, a dielectric Graded Radial INdex (GRIN) lens was simulated using the range of εr in the BLVMO-NMO system, which predicted a 70% aperture efficiency at 26 GHz, ideal for 5G applications.

Funding

EPSRC grants, EP/N010493/1 and EP/L017563/1, “Synthesizing 3D Metamaterials for RF, Microwave and THz Applications” and “Sustainability and Substitution of Functional Materials and Devices”.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Materials

Volume

12

Issue

9

Pages

1370 - 1370

Citation

WANG, D. ... et al, 2019. Temperature stable cold sintered (Bi0.95Li0.05)(V0.9Mo0.1)O4-Na2Mo2O7 microwave dielectric composites. Materials, 12 (9), 1370.

Publisher

MDPI © The Authors

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Acceptance date

25/04/2019

Publication date

2019-04-27

Copyright date

2019

Notes

This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

eISSN

1996-1944

Language

en