The orientation mechanism of (Ca,Sr)Bi_4Ti_4O_(15) ceramics prepared by slip casting in high magnetic field and subsequent sintering

摘要

A high magnetic field of 10 T was introduced into a processing of slip casting for fabricating (Ca,Sr)Bi_4Ti_4O_(15) (abbreviated as CSBT) ceramics. Feeble magnetic CSBT particles in green compacts were partially aligned through rotating a gypsum mold containing the CSBT slurry in the magnetic field. The green compacts were sintered at 1200 deg C for different time without magnetic field. With increasing of the sintering time, the preferable orientation degree of CSBT ceramics rapidly went up at the initial stage, and then slowly increased at the medium and final stages. The mechanism of the orientation degree increasing during the sintering can be attributed to a processing in which large oriented particles coarsen small randomly oriented particle.