Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 40, Issue 2, Pages 381-385Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.09.035
Keywords
Bismuth borate composite; Ultra-low-temperature cofired ceramic; Microwave dielectric properties
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Funding
- Natural Science Foundation of China [61761015, 11664008]
- Natural Science Foundation of Guangxi [2017GXNSFFA198011, 2017GXNSFDA198027]
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Bi3B5+xO12 (+ 3x/2) (x= 0 similar to 6) compounds were fabricated by a conventional solid-state reaction method. The microwave dielectric properties, sintering behaviour, crystal structure, and phase evolution of the ceramics were investigated. All samples densified at ultra-low temperatures (575 similar to 700 degrees C). As x increased, the phase composition of the ceramics gradually changed from mixed Bi4B2O9 and Bi3B5O 12 phases to a single Bi6B10O24 phase. The ceramic with x = 4 exhibited the best microwave dielectric properties of epsilon(r) = 12.14, Q x f = 14,800 GHz, and tau(f) = - 72 ppm/degrees C at 625 degrees C. The microwave dielectric properties deteriorated as x increased further. Moreover, the ceramics were proven to cofire with Al and Ag, indicating that they are candidates for ultra-low-temperature cofired ceramic devices.
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