Abstract
Ultra-low temperature co-fired ceramics technology (ULTCC) requires the microwave dielectric ceramics with lower intrinsic sintering temperature than the melting point of inner electrodes. In the present work, a novel HBO2 ceramic was found to be densified at extreme-low temperature below 200°C, with pores, residual H3BO3, amorphous B2O3 inside, with a relative permittivity ∼2.12±0.02, a Qf value ∼32,700±300GHz and a temperature coefficient of resonant frequency value ∼−43±3ppm/°C. This material can be easily obtained by dehydration from H3BO3 by sintering at low temperature below 200°C. Its extreme-low sintering temperature and water solubility also provides the possibility to achieve some novel multi-functional inorganic-organic composite in the future.
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