Structural characterization of Ba1.„Sr„TiO3 (BST) nanopowders prepared by stearic acid gel method

Abstract

Stoichiometric tetragonal Bal-xSrxTiO3 (x = 0.23) nanopowders were prepared by stearic acid gel<br />(SAG) method using barium stearate, strontium stearate, tetrabutyl titanate as Ba, Sr, Ti sources<br />and stearic acid as complexing reagent. Thermal analysis including differential thermogravimetric<br />(DTG) and TG, Fourier transform infrared spectrometry (FTIR), X-ray diffraction (XRD) and<br />transmission electron microscopy (TEM) were used to characterize the crystallization process,<br />particle size and morphology of the calcined powders. The results indicated that single- phase<br />tetragonal and well crystallized Bal-xSrxTiO3 (x = 0.23) nanopowders with particle size around<br />45 nm were formed after calcining the dried gel at 700 °C for 2 h.<br />PACS code: 81,07Wx