Chemical and structural analysis related to defects in nanocrystalline Ba1-xSrxTiO3 grown via hydrothermal sol-gel

Fuentes, S; Cespedes, F; Padilla-Campos, L; Diaz-Droguett, DE

Abstract

The chemical and structural properties of Ba1-xSrxTiO3 (BST, x=0-1) nanoparticles synthesised via sol-gel-hydrothermal were analysed. Two types of salts of Ba (BaCl2 and Ba(OH)(2)) and Sr (SrCl2 and Sr(OH)(2)) as starting reactants were used to compare two synthesis methods. Chemical characterisation and oxidation states were obtained using X-ray photoelectron spectroscopy. Structural information was acquired by Raman spectroscopy, and calculations to obtain theoretical Raman spectra associated with the different formed phases of BST were performed for comparison. The results were consistent with the presence of oxygen vacancies in all of the compounds synthesised, but the use of hydroxide salts introduced a minor concentration of oxygen vacancies into the BST compounds. In addition, the presence of oxygen vacancies produced an increase of the intensity of first-order modes of vibration and a minor oxidation state of the Ti atom in the structure. Finally, the oxygen vacancies produced a distortion of the structure, inducing the existence of the non-perovskite phase. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Más información

Título según WOS: Chemical and structural analysis related to defects in nanocrystalline Ba1-xSrxTiO3 grown via hydrothermal sol-gel
Título de la Revista: CERAMICS INTERNATIONAL
Volumen: 40
Número: 3
Editorial: ELSEVIER SCI LTD
Fecha de publicación: 2014
Página de inicio: 4975
Página final: 4984
Idioma: English
URL: http://linkinghub.elsevier.com/retrieve/pii/S0272884213012376
DOI:

10.1016/j.ceramint.2013.09.134

Notas: ISI