Ultralow-Temperature Synthesis and Densification of Ag2CaV4O12 with Improved Microwave Dielectric Performances

Li, Chunchun, Yin, Changzhi, Khaliq, Jibran and Liu, Laijun (2021) Ultralow-Temperature Synthesis and Densification of Ag2CaV4O12 with Improved Microwave Dielectric Performances. ACS Sustainable Chemistry and Engineering, 9 (43). pp. 14461-14469. ISSN 2168-0485

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Official URL: https://doi.org/10.1021/acssuschemeng.1c04791


At extremely low temperatures, Ag2CaV4O12 was easily synthesized using the traditional solid-state approach. With a low relative permittivity (εr) of 7.52, a high quality factor (Q × f) of 48 800 GHz (f = 13.6 GHz), and a temperature coefficient of resonance frequency (τf) of −77.4 ppm/°C, dense ceramics sintered at 480 °C with outstanding microwave dielectric characteristics were attained. By combining with rutile TiO2, a composite ceramic with balanced microwave dielectric properties (τf = 3.2 ppm/°C, εr = 10.96, and Q × f = 49 081 GHz) was achieved. No chemical reaction between Ag2CaV4O12 and silver and aluminum occurred. All of the findings show that Ag2CaV4O12 has the potential to be used as dielectric resonances in wireless communication and as substrates in low-temperature cofired ceramics. Furthermore, the processing at an ultralow temperature of Ag2CaV4O12 shows that it is extraordinarily energy saving from the point of view of fabrication and might allow for room-temperature synthesis by combining with high-energy mechanical milling or sintering using a high pressure such as hot isostatic pressing (HIP), spark plasma sintering (SPS), and cold sintering (CS).

Item Type: Article
Additional Information: Funding information: The authors would like to thank the financial assistance from the Natural Science Foundation of China (No. 62061011), the National Key Research and Development Plan of China (No. 2017YFB0406300), the High-Level Innovation Team, and the Outstanding Scholar Program of Guangxi Institutes. The authors would also like to express their gratitude to the officials in the IR beamline workstation of the National Synchrotron Radiation Laboratory (NSRL) for their assistance in the IR measurement.
Subjects: F200 Materials Science
H700 Production and Manufacturing Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 02 Nov 2021 10:52
Last Modified: 21 Oct 2022 08:01
URI: https://nrl.northumbria.ac.uk/id/eprint/47610

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