Abstract
Bi4B2+xO9+3x/2 (x = 1.5, 2, 2.5, 3) compounds with high relative permittivity and ultra-low sintering temperature were prepared using the conventional solid-state method. Due to the volatilisation of B2O3 during sintering, a Bi4B2O9 single phase was obtained in excess addition of boric acid for x = 2.5. The densest structure of the Bi4B2+xO9+3x/2 (x = 2.5) ceramic, sintered at 585 °C, exhibited good microwave dielectric properties of a relative permittivity (εr) = 42.5, quality factor (Q × f) = 3240 GHz, and temperature coefficient of resonance frequency (τƒ) = −59 ppm/°C. As the value of x changed, the second phases of Bi2O3 and Bi3B5O12 appeared, and the (εr) and (τƒ) values decreased. The Bi4B2+xO9+3x/2 (x = 2.5) ceramics did not react with either Ag or Al, indicating that they are good candidate materials for ultra-low temperature co-fired ceramic (ULTCC) applications.
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