ULTCC glass composites based on rutile and anatase with cofiring at 400 °C for high frequency applications
Varghese, Jobin; Ramachandran, Prasadh; Sobocinsk, Maciej; Vahera, Timo; Jantunen, Heli (2019-01-07)
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
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https://urn.fi/URN:NBN:fi-fe2019040310905
Tiivistelmä
Abstract
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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