Preparation of high-density Bi2O3 ceramics by low temperature sintering

Bi 2 O 3 ceramics with high density were prepared by low temperature sintering using acetic acid as the co-solvent. The effect of acetic acid concentration, pressure, temperature and holding time during sintering on the densification of Bi 2 O 3 ceramics was investigated. The Bi 2 O 3 ceramic with a relative density of 98.31% was obtained by low temperature sintering at 270 ℃/330 MPa for 140 min using 3 mol/L acetic acid solution. The densification mechanism for low temperature sintering Bi 2 O 3 ceramic followed "dissolution–precipitation–growth", which is different from the densification mechanism of the traditional high-temperature sintered ceramics. The Bi 2 O 3 ceramic with a permittivity ( ε r ) ~ 32.2, a quality factor (Qf) ~ 16,425 GHz and a grain size ~ 4.2 μm was obtained. The study provides a new method of ceramic development by low temperature sintering.