The effect of Ba2+ doping on the structure of SrBi4Ti4O15

In this paper, bi-layered structural ferroelectric materials Sr1-xBaxBi4Ti4O15(SBBT) (x=0, 0.2, 0.4, 0.5, 0.6, 0.8, 1.0) were prepared using sol-gel method. The stable precursors were fabricated by mixing the salts of strontium (Sr), barium (Ba), bismuth (Bi) and titanium butoxide in acetic acid together with ethanolamine as a catalyzer and acetylacetone as a stable agent. The structural evolution of SBBT after Ba2+ doping was studied. The experimental results confirm that complete solid solutions of SrBi4Ti4O15 and BaBi4Ti4O15 are formed. The perovskite lattice will expand after the doping of Ba2+ because of the difference of ionic radii of strontium and barium cations, which will lead to increasing of the lattice spacing. With the increase of the content of Ba cations the grain size of SBBT powder increases, the granularity distribution widens and average particle size of SBBT powder also increases. The average particle size of SrBi4Ti4O15 and BaBi4Ti4O15 is 82.5 and 165.2 nm, respectively. (C) 2004 Kluwer Academic Publishers.