Goulas, A., Chi-Tangyie, G., Zhang, S. et al. (8 more authors) (2021) Direct ink writing of bismuth molybdate microwave dielectric ceramics. Ceramics International, 47 (6). pp. 7625-7631. ISSN 0272-8842
Abstract
Additive manufacturing via direct ink writing and microwave dielectric characterisation of commercially produced low sintering temperature bismuth molybdenum oxide ceramics, have been both performed for the first time, following a powder-to-product holistic approach. We demonstrated that direct ink writing is an excellent candidate for producing dielectric substrates to be used for wireless telecommunication applications operating at microwave (MW) frequencies, with great repeatability and properties comparable to ceramics fabricated via conventional processing routes. The optimum density (relative density of ρr ≈ 93%) of the 3D printed test samples was obtained by sintering at 660 °C for 2 h, resulting in a relative permittivity εr = 35.7, dielectric loss tanδ = 0.0004 and microwave quality factor Q × f = 14,928 GHz. Sintering at higher temperatures promoted a porosity increase due to mismatching grain growth mechanisms and phase decomposition, that collectively hindered the test samples’ microwave dielectric performance in terms of achievable relative permittivity (εr) and dielectric loss (tanδ).
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 Elsevier Ltd and Techna Group S.r.l. This is an author produced version of a paper subsequently published in Ceramics International. Uploaded in accordance with the publisher's self-archiving policy. Article available under the terms of the CC-BY-NC-ND licence (https://creativecommons.org/licenses/by-nc-nd/4.0/). |
Keywords: | Direct ink writing; LTCC; Bismuth molybdenum oxide; Microwave ceramics |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/N010493/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 26 Nov 2020 13:18 |
Last Modified: | 02 Feb 2022 10:56 |
Status: | Published |
Publisher: | Elsevier BV |
Refereed: | Yes |
Identification Number: | 10.1016/j.ceramint.2020.11.102 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:168447 |