University of Oulu

Varghese, J., Ramachandran, P., Sobocinski, M., Vahera, T., Jantunen, H. (2019) ULTCC Glass Composites Based on Rutile and Anatase with Cofiring at 400 °C for High Frequency Applications. ACS Sustainable Chemistry and Engineering, 7 (4), 4274-4283. doi:10.1021/acssuschemeng.8b06048

ULTCC glass composites based on rutile and anatase with cofiring at 400 °C for high frequency applications

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Author: Varghese, Jobin1; Ramachandran, Prasadh1; Sobocinsk, Maciej1;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, FI-90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.7 MB)
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Language: English
Published: American Chemical Society, 2019
Publish Date: 2019-04-03


The article presents the very first materials to the Ultra-Low Temperature Co-fired Ceramic (ULTCC) technology with the sintering temperature of 400 °C. The dielectric composites are based on a rutile and anatase with commercial GO17 sealing glass. In addition to the bulk samples, also the tape casting procedure is introduce to showing its feasibility to co-firing with commercial Ag electrodes at 400 °C. The structural, microstructural, thermal and microwave dielectric properties in the green and sintered samples were investigated. The optimum amount of glass to fabricate substrates was found to be 30 vol.%. The ULTCC substrates with the anatase TiO₂A-30GO17 and rutile TiO₂R-30GO17 were sintered at 400 °C showed a relative permittivity of 9.9 and 15 and a dielectric loss of 0.006 and 0.003, respectively, at the measurement frequency of 9.9 GHz. The temperature dependences of the relative permittivity were +70 and −400 ppm/°C, respectively. Moreover, the coefficients of thermal expansion of the substrates were 7.4 and 8.3 ppm/°C in the measured temperature range of 50–300 °C. A preliminary test to study the feasibility of the anatase TiO₂A-30GO17 for a dual band antenna was performed due its relative stable temperature behavior.

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Series: ACS sustainable chemistry & engineering
ISSN: 2168-0485
ISSN-E: 2168-0485
ISSN-L: 2168-0485
Volume: 7
Issue: 4
Pages: 4274 - 4283
DOI: 10.1021/acssuschemeng.8b06048
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: The work is financed by the European Research Council (ERC) Projects No: 24001893. The ERC POC NO is 812837. J.V is thankful to Ulla Tuominen Foundation project grant in 2018. This work was also supported in part by the Academy of Finland 6Genesis Flagship (grant no. 318927). Additionally, the authors acknowledge Schott AG for the commercial GO17 glass and Dupont for 951 LTCC tape samples.
EU Grant Number: (812837) FUNCOMP - Fabricating Functional Components in Room Temperature
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
Copyright information: © 2019 American Chemical Society. ACS AuthorChoice - This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.