The preparation of BaTiO3 and Ba0.65Sr0.35TiO3 powders from complex acetate precursors

Abstract

Barium titanium (BT) acetate and barium strontium titanium (BST) acetate complex precursor solutions were synthesized in an attempt to produce air and temperature stable complex precursor by first reacting titanium isopropoxide with acetic acid and then mixing the resultant solutions with barium and strontium acetate acetic acid solution. All alkoxide groups in the titanium isopropoxide were found to be replaced by acetate ligands in first reaction and these acetate are directly bounded to titanium atoms. After suitable precipitation and filtering, new acetate complex precursor powder of barium titanium and barium strontium titanium were produced. The thermal decomposition processes of metal acetate complex precursor were studied by, IR, XRD and DTA(TG). Formation of Ba2Ti2O5 . CO3 type intermediate phases were found during the thermal decomposition, accompanied by direct crystallization to pseudo-cubic BaTiO3 and Ba0.65Sr0.35TiO3 phase upon heating above 600 degrees C.