Abstract
Barium-bismuth titanate, BaBi4Ti4O15 (BBT), a member of Aurivillius bismuth-based layer-structure perovskites, was prepared from stoichiometric amounts of barium titanate and bismuth titanate obtained via mechanochemical synthesis. Mechanochemical synthesis was performed in air atmosphere in a planetary ball mill. The reaction mechanism of BaBi4Ti4O15 and the preparation and characteristics of BBT ceramic powders were studied using XRD, Raman spectroscopy, particle analysis and SEM. The Bi-layered perovskite structure of BaBi4Ti4O15 ceramic forms at 1100 ?C for 4 h without a pre-calcination step. The microstructure of BaBi4Ti4O15 exhibits plate-like grains typical for the Bi-layered structured material and spherical and polygonal grains. The Ba2+ addition leads to changes in the microstructure development, particularly in the change of the average grain size.
Highlights
Bi-based Aurivillius family of compounds have received considerable attention as materials for ferroelectric random access memory (FRAM) because of their low operating voltage, field, superior polarization fatigue resistant characteristics and high Curie temperature [1,2,3,4,5,6,7,8]
In the present work BBT was prepared from stoichiometric quantities of BT and BIT obtained via mechanochemical synthesis
Bi-layered structure ferroelectric material-bismuth titanate, Bi4Ti3O12 (BIT) and barium-bismuth titanate, BaBi4Ti4O15 (BBT) ceramic powders were prepared by the mechanical synthesis process
Summary
Bi-based Aurivillius family of compounds have received considerable attention as materials for ferroelectric random access memory (FRAM) because of their low operating voltage, field, superior polarization fatigue resistant characteristics and high Curie temperature [1,2,3,4,5,6,7,8]. A large remnant polarization, low coercive field and high Curie temperature are required for better performance of FRAM devices. Our present work deals with the compound BBT withn=4 and structural formula as (Bi2O2)2+((BaBi2)Ti4O13)2-, where the Ba- and Bi-ions occupies the A-site and Ti-ions resides in the B-site, respectively. Synthesis of BBT ceramics is mainly based on chemical and solid-state reaction methods. BBT can be produced by conventional solid-state reaction starting from BaCO3, TiO2, Bi2O3 [2]. The solid-state reactions initiated by intensive milling in high-energy ball mills could be a good choice for
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