SONG Jinjie, ZHU Guisheng, YIN Rong, XU Huarui, FANG Rongyu, FU Weining, WANG Qi, LAN Zheng, LI Chongkang, TAO Zexian

(Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541000, Guangxi, China)

Abstract: α-MoO₃ ceramics with a high density were prepared at 200 °C using acetic acid solution as the co-solvent. The effects of acetic acid concentration, pressure and temperature on the densification of α-MoO₃ ceramics were studied. The acetic acid had a strong effect on relative density of the ceramics. Specifically, α-MoO₃ ceramics with a relative density of 96.85% were obtained after sintering at an ultra-low temperature sintering at 200 ℃ and a pressure of 250 MPa for 30 min using 2 mol/L acetic acid solution. The sample had a dielectric constant of 8.71 and Qf of 2336 GHz. The densification mechanism of the acetic acid-assisted ultra-low temperature sintering was “dissolution-precipitation-growth”. The relative weight loss of the ceramic was merely 0.13% after the ceramic was calcined at 700 ℃, showing high stability. This study provides a new strategy for low temperature sintering of ceramics.
Key words: acetic acid solution; ultra-low temperature; MoO₃ ceramic; dissolution; precipitation; grain growt