Effect of silica sintering additive on the sintering behavior and dielectric properties of strontium barium niobate ceramics

✍ Scribed by Lili Wang; Wanmei Sui; Kunchang Mu; Shijun Luan

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 769 KB
• Volume: 29
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2008.09.008

✦ Synopsis

Sr 0.5 Ba 0.5 Nb 2 O 6 powders were prepared in the partial coprecipitation method. Using amorphous SiO 2 as the sintering additive, Sr 0.5 Ba 0.5 Nb 2 O 6 ceramics were sintered at different temperatures and the effects of the additive on the sintering behaviors and dielectric properties were studied. The phase structure, microstructure and dielectric properties of the samples were investigated in X-ray diffraction (XRD), SEM and LCR analyzer respectively. The results indicated that the amorphous SiO 2 additive could accelerate the pore elimination, shorten the sintering time and enhance the density for Sr 0.5 Ba 0.5 Nb 2 O 6 ceramics. The well development of microstructure promoted by the additives can result in the improvement of the dielectric constant and the weakening of the relax behavior. With the help of the additive of 1.5 wt.%, the relative density of the sample sintered at 1300 • C only for 2 h can reached 94.3% and the dielectric constant was up to 4322.