X-ray diffraction and Raman study of nanogranular BaTiO3-CoFe2O4 thin films deposited by laser ablation on Si/Pt substrates

• Type: Article in International Scientific Journal
• Date: 2007

Authors

barbosa, j. (Author) Other; almeida, b. (Author) Other; mendes, j. a. (Author) Other; rolo, a. g. (Author) Other; araujo, j. p. (Author) FCUP

Journal

Title: Physica Status Solidi (A) Applications and Materials

Vol. 204

Pages: 1731-1737

ISSN: 1862-6300

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 29 Citations

Scopus - 30 Citations

Other information

Authenticus ID: P-004-9XN

DOI: 10.1002/pssa.200675327

Abstract (EN): Nanocomposite thin films composed by (BaTiO3)(1-x)-(CoFe2O4)(x) with different cobalt ferrite concentrations (x) have been deposited by pulsed laser ablation on platinum covered Si(001) substrates. The films structure was studied by X-ray diffraction and Raman spectroscopy. It was found that the CoFe2O4 phase unit cell was compressed along the growth direction of the films, and it relaxed with increasing x. The opposite behavior was observed in the BaTiO3 phase where the lattice parameters obtained from the X-ray measurements presented a progressive distortion of its unit cell with increasing x. The presence of the strain in the films induced a blueshift of the Raman peaks of CoFe2O4 that decreased with increasing CoFe2O4 concentration. Cation disorder in the cobalt ferrite was observed for lower x, where the nanograins are more isolated and subjected to more strain, which was progressively decreased for higher CoFe2O4 content in the films. (c) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7