Abstract
Bi3B5+xO12+3x/2 (x = 0∼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∼700 °C). As x increased, the phase composition of the ceramics gradually changed from mixed Bi4B2O9 and Bi3B5O12 phases to a single Bi6B10O24 phase. The ceramic with x = 4 exhibited the best microwave dielectric properties of εr = 12.14, Q × f = 14,800 GHz, and τƒ = −72 ppm/°C at 625 °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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