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Title: Temperature stable cold sintered (Bi0.95Li0.05)(V0.9Mo0.1)O4-Na2Mo2O7 microwave dielectric composites
Authors: Wang, Dawei
Zhang, Shiyu
Zhou, Di
Song, Kaixin
Feteira, Antonio
Vardaxoglou, J.C.
Whittow, W.G.
Cadman, Darren A.
Reaney, Ian M.
Keywords: Cold sintering process
Microwave dielectric ceramics
Graded radial index lens
Issue Date: 2019
Publisher: MDPI © The Authors
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.
Abstract: 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.
Description: 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/).
Sponsor: 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”.
Version: Published
DOI: 10.3390/ma12091370
URI: https://dspace.lboro.ac.uk/2134/37679
Publisher Link: https://doi.org/10.3390/ma12091370
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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