Paper Title:
Structural Characterization of Lead Metaniobate Thin Films Deposited by Pulsed Laser Ablation
  Abstract

The ferroelectric polymorph of lead metaniobate (PbNb2O6) presents an orthorhombic structure that is metastable at room temperature. This phase is obtained by quenching from high temperature. The fabrication of lead niobate thin films with this orthorhombic form has been reported to be difficult due to the presence of phases with the rhombohedric form or other nonstoichiometric phases. In this work, lead niobate thin films have been prepared by laser ablation, at different oxygen pressures and with different substrate temperatures. Their structure was studied by X-ray diffraction and their surface was examined by scanning electron microscopy (SEM). The results show that for low deposition temperatures the films presented a rhombohedric-PbNb2O6 structural phase. As Tdep increases the films started to develop an orthorhombic- PbNb2O6 structure that appeared at 400°C and remains up to 600°C. For lower oxygen pressure during deposition, a mixture of this phase and other orthorhombic lead deficient phases are present in the films. On the other hand, by increasing the oxygen pressure the lead deficient phases are strongly reduced and the films present only the orthorhombic- PbNb2O6 structure.

  Info
Periodical
Materials Science Forum (Volumes 514-516)
Edited by
Paula Maria Vilarinho
Pages
207-211
DOI
10.4028/www.scientific.net/MSF.514-516.207
Citation
F. Cardoso, B. G. Almeida, P. Caldelas, J. A. Mendes, "Structural Characterization of Lead Metaniobate Thin Films Deposited by Pulsed Laser Ablation", Materials Science Forum, Vols. 514-516, pp. 207-211, 2006
Online since
May 2006
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