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Title: High quality factor cold sintered Li2MoO4BaFe12O19 composites for microwave applications
Authors: Faouri, Sinan S.
Mostaed, Ali
Dean, Julian S.
Wang, Dawei
Sinclair, Derek C.
Zhang, Shiyu
Whittow, W.G.
Vardaxoglou, J.C.
Reaney, Ian M.
Keywords: Cold sintering process
Ceramic material
Composite
Dielectric
Finite element modelling (FEM)
Issue Date: 2019
Publisher: Elsevier © Acta Materialia Inc.
Citation: FAOURI, S.S. ... et al, 2019. High quality factor cold sintered Li2MoO4BaFe12O19 composites for microwave applications. Acta Materialia, 166, pp.202-207.
Abstract: Ceramics-ceramic composites in series (1-x)Li2MoO4-xBaFe12O19 (LMO-BF12, 0.00 ≤ x ≤ 0.15) have been cold sintered at 120 °C and their structure and properties characterized. X-ray diffraction, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) confirmed that compositions were dual phase and had a dense microstructure. Composites in the xBF12-(1-x)LMO (0.0 ≤ x ≤ 0.15) series resonated at MW frequencies (∼6 GHz) with 5.6≤εr ≤ 5.8 and Qf = 16,000–22,000 GHz, despite the black colour of compositions with x > 0. The permeability of the composites was measured in the X band (∼8 GHz) and showed an increase from 0.94 (x = 0.05) to 1.02 (x = 0.15). Finite element modelling revealed that the volume fraction of BF12 dictates the conductivity of the material, with a percolation threshold at 10 vol% BF12 but changes in εr as a function of x were readily explained using a series mixing model. In summary, these composites are considered suitable for the fabrication of dual mode or enhanced bandwidth microstrip patch antennas.
Description: This paper is closed access until 2 January 2020.
Sponsor: Ian M. Reaney and Julian S. Dean would like to acknowledge the Engineering and Physical Sciences Research Council (EPSRC) grants, EP/L017563/1 and EP/N010493/1.
Version: Accepted for publication
DOI: 10.1016/j.actamat.2018.12.057
URI: https://dspace.lboro.ac.uk/2134/36800
Publisher Link: https://doi.org/10.1016/j.actamat.2018.12.057
ISSN: 1359-6454
Appears in Collections:Closed Access (Mechanical, Electrical and Manufacturing Engineering)

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