Microwave dielectric properties of low-temperature sinterable α-MoO3
Varghese, Jobin; Siponkoski, Tuomo; Nelo, Mikko; Sebastian, Mailadil Thomas; Jantunen, Heli (2017-11-11)
Jobin Varghese, Tuomo Siponkoski, Mikko Nelo, Mailadil Thomas Sebastian, Heli Jantunen. Microwave dielectric properties of low-temperature sinterable α-MoO3. Journal of the European Ceramic Society, Volume 38, Issue 4, 2018. Pages 1541-1547, ISSN 0955-2219, https://doi.org/10.1016/j.jeurceramsoc.2017.11.027
© 2017 Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe201902215853
Tiivistelmä
Abstract
The α-MoO3 ceramics were prepared by uniaxial pressing and sintering of MoO3 powder at 650 °C and their structure, microstructure, densification and sintering and microwave dielectric properties were investigated. The sintering temperature of α-MoO3 was optimized based on the best densification and microwave dielectric properties. After sintering at 650 °C the relative permittivity was found to be 6.6 and the quality factor was 41,000 GHz at 11.3 GHz. The full-width half-maximum of the A1g Raman mode of bulk α-MoO3 at different sintering temperatures correlated well with the Qf values. Moreover, the sintered samples showed a temperature coefficient of the resonant frequency of −25 ppm/°C in the temperature range from −40 to 85 °C and they exhibited a very low coefficient of thermal expansion of ±4 ppm/°C. These microwave dielectric properties of α-MoO3 will be of great benefit in future MoO3 based materials and their applications.
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