Abstract

The synthesis of Ba-Ti precursors was achieved by a self-assembly synthesis starting from barium metal, titanium n-propoxide and 2,2,6,6-tetramethyl-heptanedione (Hthd) in (PrOH)-Pr-n. The structure of the obtained Ba2Ti2(thd)(4)((OPr)-Pr-n)(8)((n)Pr0H)2 compound is of the M2M2'X-16 type-one of the most widespread for both the homo- and heterometallic tetranuclear alkoxide complexes. It remains unchanged in solution according to the NMR data, which are easily interpreted in terms of the same molecular structure as that revealed by crystallography for the solid state. In order to form BaTiO3 phase doped with 1% of the Eu3+ the heterometallic alkoxide complex of barium and titanium with the necessary amount of Eu dissolved in the reaction mixture were hydrolyzed by moist ethanol on reflux in 1 M solution in n-propanol. The obtained gels were dried in vacuum and have been heat treated at different temperatures (700-1100 degrees C). XRD measurements were performed in order to study the phase formation and grain size. TEM images have been taken for the morphology and grain size characterization. Emission spectra and decay times were measured for the description of the luminescence properties of the obtained system. (c) 2007 Elsevier B.V. All rights reserved.

Keywords

barium titanate; double titanates; europium; nanopowders; single-source precursors; luminescence

Published in

Journal of Alloys and Compounds
2008, volume: 451, number: 1-2, pages: 557-562
Publisher: ELSEVIER SCIENCE SA

Authors' information