Study of Structure and Properties of Bi_4Ti_3O_(12) Prepared by Mechanochemical Syntheses

摘要

Bi_4Ti_3O_(12) powder was synthesized from bismuth oxide and titanium oxide. Mixture of oxides was milled in zirconium oxide jar in the planetary ball-mill during 1,3 and 6 h. Extended time of milling directed to formation of higher amount of titanates perovskite phase. Bi_4Ti_3O_(12) was formed between 1 and 3 h of milling time. The phase formation of Bi_4Ti_3O_(12), crystal structure and powder particle size were followed by XRD, Raman spectroscopy and SEM analysis. After milling for various times the powders were compacted by pressing and isothermal sintering. Sample milled for 3 h and subsequently sintered at 1000 deg C for 24 h exhibit a hysteresis loop, confirming that the synthesized material possesses ferroelectric properties. All results affect that the structure Bi_4Ti_3O_(12) is strongly dependent on the milling time.