Sandwiched BaNd_2Ti_4O_(12)/Bi_4Ti_3O_(12)/BaNd_2Ti_4O_(12) ceramics prepared by spark plasma sintering

摘要

Spark plasma sintering (SPS) combined with heat treatment was investigated to prepare laminated ceramics from compositions having quite different sintering temperatures. Although the optimal sintering temperature of BaNd_2Ti_4O_(12) (BNT) ceramics was much higher than that of Bi_4Ti_3O_(12) (BIT) ceramics, sandwiched BaNd_2Ti_4O_(12)/Bi_4Ti_3O_(12)/BaNd_2Ti_4O_(12) (BNT/BIT/BNT) composite ceramics were successfully prepared with this new method. The results of scanning electron microscopy (SEM) and electron probe microanalysis (EPMA) showed that the BNT layers and the BIT layer were well bonded and no significant diffusion between them was observed. The temperature coefficient of dielectric constant of the laminated ceramic was found to be much smaller than that of BNT ceramic.