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The thin films of Ba0.8Sr0.2TiO3 (BST) investigated in this work were produced by pulsed laser deposition at different pulse-repetition frequencies (PRFs). First measurements by X-ray diffraction suggested a crystalline nature of the deposited films. However, scanning transmission electron microscopy and transmission electron microscopy images have revealed that a BST amorphous layer of considerable thickness is formed at the interface between the film and the Pt layer in the films deposited at 10 Hz. Moreover, energy-dispersive X-ray spectroscopy shows that the composition of the BST layer is the same in both the amorphous and the crystalline phases whereas Rutherford backscattering spectrometry measurements have revealed a stoichiometry of the films identical to that of the target. A new interpretation is proposed to explain the formation of this amorphous layer, based on the PRF used during the …
Publication date: 
1 Aug 2013

JPB Silva, KC Sekhar, SAS Rodrigues, M Pereira, A Parisini, E Alves, NP Barradas, MJM Gomes

Biblio References: 
Volume: 278 Pages: 136-141
Applied Surface Science