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

Dawei Wang; Shiyu Zhang; Di Zhou; Kaixin Song; Antonio Feteira; Yiannis Vardaxoglou; Will Whittow; Darren Cadman; Ian M. Reaney

doi:10.3390/ma12091370

Temperature stable cold sintered (Bi_0.95Li_0.05)(V_0.9Mo_0.1)O₄-Na₂Mo₂O₇ microwave dielectric composites

Dawei Wang
, Shiyu Zhang
, Di Zhou
, Kaixin Song
, Antonio Feteira
, Yiannis Vardaxoglou
, Will Whittow
, Darren Cadman
, Ian M. Reaney

Faculty of Electronic and Information Engineering

Research output: Contribution to journal › Article › peer-review

53 Scopus citations

Abstract

Dense (Bi_0.95Li_0.05)(V_0.9Mo_0.1)O₄-Na₂Mo₂O₇ (100-x) wt.% (Bi_0.95Li_0.05)(V_0.9Mo_0.1)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 increasingNMO concentration, the relative pemittivity (ε_r) 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 ε_r ~ 40 and Qf ~ 4000 GHz. Finally, a dielectric Graded Radial INdex (GRIN) lens was simulated using the range of ε_r in the BLVMO-NMO system, which predicted a 70% aperture efficiency at 26 GHz, ideal for 5G applications.

Original language	English
Article number	1370
Journal	Materials
Volume	12
Issue number	9
DOIs	https://doi.org/10.3390/ma12091370
State	Published - 2019

Keywords

Cold sintering process
Graded radial index lens
Microwave dielectric ceramics

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10.3390/ma12091370

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@article{1702b45bf0c24ac19bdc60fbdaf5e076,

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

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 increasingNMO 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 \textasciitilde{} 40 and Qf \textasciitilde{} 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.",

keywords = "Cold sintering process, Graded radial index lens, Microwave dielectric ceramics",

author = "Dawei Wang and Shiyu Zhang and Di Zhou and Kaixin Song and Antonio Feteira and Yiannis Vardaxoglou and Will Whittow and Darren Cadman and Reaney, \{Ian M.\}",

note = "Publisher Copyright: {\textcopyright} 2019 by the authors.",

year = "2019",

doi = "10.3390/ma12091370",

language = "英语",

volume = "12",

journal = "Materials",

issn = "1996-1944",

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TY - JOUR

T1 - Temperature stable cold sintered (Bi0.95Li0.05)(V0.9Mo0.1)O4-Na2Mo2O7 microwave dielectric composites

AU - Wang, Dawei

AU - Zhang, Shiyu

AU - Zhou, Di

AU - Song, Kaixin

AU - Feteira, Antonio

AU - Vardaxoglou, Yiannis

AU - Whittow, Will

AU - Cadman, Darren

AU - Reaney, Ian M.

PY - 2019

Y1 - 2019

N2 - 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 increasingNMO 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.

AB - 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 increasingNMO 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.

KW - Cold sintering process

KW - Graded radial index lens

KW - Microwave dielectric ceramics

UR - https://www.scopus.com/pages/publications/85065700970

U2 - 10.3390/ma12091370

DO - 10.3390/ma12091370

M3 - 文章

AN - SCOPUS:85065700970

SN - 1996-1944

VL - 12

JO - Materials

JF - Materials

IS - 9

M1 - 1370

ER -

Temperature stable cold sintered (Bi_0.95Li_0.05)(V_0.9Mo_0.1)O₄-Na₂Mo₂O₇ microwave dielectric composites

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