Author/Authors :
Souza، نويسنده , , A.E. and Silva، نويسنده , , R.A. and Santos، نويسنده , , G.T.A. and Teixeira، نويسنده , , S.R. and Antonio، نويسنده , , S.G. and Moreira، نويسنده , , M.L. and Volanti، نويسنده , , D.P. and Longo، نويسنده , , E.، نويسنده ,
Abstract :
BaxSr1−xTiO3 was prepared by the microwave-assisted hydrothermal method. The ceramic powder was characterized by X-ray diffraction, Raman, ultraviolet–visible and photoluminescence (PL) spectroscopies and scanning electron microscopy (FE-SEM). The results confirm that the powders consist of perovskite-type cubic and tetragonal crystalline structures. The Raman data show bands characterizing a multi-phonon process, suggesting the presence of defects, due to partial Sr/Ba substitution, resulting in different distorted clusters. A broad-band PL emission (blue light region) confirms the existence of these defects, which together with the results of ultraviolet–visible spectroscopy suggests non-uniformity in band structure. The distinct morphologies observed are associated with different clusters organization during the nucleation and growth of the BaxSr1−xTiO3 nanoparticles.
