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Open AccessFeature PaperArticle

Temperature Stable Cold Sintered (Bi0.95Li0.05)(V0.9Mo0.1)O4-Na2Mo2O7 Microwave Dielectric Composites

1
Department of Materials Science and Engineering, University of Sheffield, Sheffield S1 3JD, UK
2
Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough LE11 3TU, UK
3
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China
4
College of Electronics Information, Hangzhou Dianzi University, Hangzhou 310018, China
5
Christian Doppler Laboratory for Advanced Ferroic Oxides, Sheffield Hallam University, Sheffield S1 1WB, UK
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(9), 1370; https://doi.org/10.3390/ma12091370
Received: 6 March 2019 / Revised: 25 March 2019 / Accepted: 25 April 2019 / Published: 27 April 2019
(This article belongs to the Special Issue Electroceramic Materials)
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. View Full-Text
Keywords: cold sintering process; microwave dielectric ceramics; graded radial index lens cold sintering process; microwave dielectric ceramics; graded radial index lens
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MDPI and ACS Style

Wang, D.; Zhang, S.; Zhou, D.; Song, K.; Feteira, A.; Vardaxoglou, Y.; Whittow, W.; Cadman, D.; Reaney, I.M. Temperature Stable Cold Sintered (Bi0.95Li0.05)(V0.9Mo0.1)O4-Na2Mo2O7 Microwave Dielectric Composites. Materials 2019, 12, 1370.

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