Study of barium bismuth titanate prepared by mechanochemical synthesis

• Published in: Science of sintering Vol. 41; no. 3; pp. 329 - 335
• Main Authors: Lazarevic, Z.Z., Bobic, J., Romcevic, N.Z., Paunovic, N., Stojanovic, B.D.
• Format: Journal Article
• Language: English
• Published: International Institute for the Science of Sintering, Beograd 2009
• Subjects: BaBi4Ti4O15; ceramics; raman spectroscopy; SEM; XRD
• ISSN: 0350-820X; 1820-7413
• DOI: 10.2298/SOS0903329L

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. Barijum bizmut titanat, BaBi4Ti4O15 (BBT), clan Aurivillius-ove grupe perovskitnih jedinjenja, je pripremljen postupkom mehanohemijske sinteze iz odgovarajuce kolicine barijum titanata i bizmut titanata. Mehanohemijska sinteza je izvedena u atmosferi vazduha u mlinu sa kuglama. Reakcioni mehanizam BaBi4Ti4O15, dobijanje i karakteristike BBT keramickog praha su bile proucavane koristeci metodu XRD, Raman spektroskopiju, analizu cestica i SEM. Bi-slojevita perovskitna struktura BaBi4Ti4O15 keramike je dobijena na 1100 ?C za 4 h bez prethodne kalcinacije. Mikrostruktura BaBi4Ti4O15 je u obliku plocastih zrna sto je tipicno za Bi-slojevite strukturne materijale i sfernih i poligonalnih zrna. Dodatak Ba2+ dovodi do promene u razvoju mikrostrukture, narocito u promeni prosecne velicine zrna.