Chemistry of surface nanostructures in lead precursor-rich PbZr 0.52 Ti 0.48 O 3 sol-gel films

I Gueye 1 G Le Rhun 1 P Gergaud 1 O Renault 1 E Defay 2 N Barrett 3, *
* Corresponding author
1 CEA-LETI - Laboratoire d'Electronique et des Technologies de l'Information
2 LIST - Luxembourg Institute of Science and Technology
3 SPEC - UMR3680 - Service de physique de l'état condensé
Abstract : We present a study of the chemistry of the nanostructured phase at the surface of lead zirconium titanate PbZr 0.52 Ti 0.48 O 3 (PZT) films synthesized by sol-gel method. In sol-gel synthesis, excess lead precursor is used to maintain the target stoichiometry. Surface nanostructures appear at 10% excess lead precursor whereas 30% excess precursor inhibits their formation. Using the surface-sensitive, quantitative X-ray photoelectron spectroscopy and glancing angle X-ray diffraction we have shown that the chemical composition of the nanostructures is ZrO 1.82−1.89 rather than pyrochlore often described in the literature. The presence of a possibly discontinuous layer of wide band gap ZrO 1.82−1.89 could be of importance in determining the electrical properties of PZT-based metal-insulator-metal heterostructures.
Keywords : SEM Surface phase Diffraction PZT X-ray photoelectron spectroscopy
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I Gueye, G Le Rhun, P Gergaud, O Renault, E Defay, et al.. Chemistry of surface nanostructures in lead precursor-rich PbZr 0.52 Ti 0.48 O 3 sol-gel films. Applied Surface Science, Elsevier, 2016, 363, pp.21-28. ⟨10.1016/j.apsusc.2015.11.118⟩. ⟨cea-01272812⟩

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