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Lead enrichment at the surface of lead zirconate titanate thin films (Abstract/Poster in convegno)

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Lead enrichment at the surface of lead zirconate titanate thin films (Abstract/Poster in convegno) (literal)

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B. E. Watts, F. Leccabue, G. Bocelli, G. Padeletti and S. Kaciulis (2004)
Lead enrichment at the surface of lead zirconate titanate thin films
in International Conference on Electrocemmics and their Applications Electroceramics IX, Cherbourg, France, May 31 - Jun 06, 2001
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Istituto IMEM/CNR, Viale delle Scienze 37a, I-43010 Fontanini- Parma, Italy; Istituto per lo Studio dei Materiali Nanostrutturati (ISMN), CNR, P.O. Box 10,I-00016 Monterotondo Staz. (RM), Italy (literal)

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Abstract

Ferroelectric thin films have been investigated intensely by many researchers over the past decade, but some important phenomena that influence the electrical properties have been overlooked. This work addresses the lead enrichment, which is observed on the surface of lead zirconate titanate films. The XPS compositional profiles of PZT films prepared using different thermal treatments are presented and correlated with the preparation conditions. The segregation profiles are explained in terms of a simple oxidation model that induces the diffusion oflead to the surface. The ionic diffusion also induces selfpolarisation, commonly seen in ferroelectric films. The implications on the electrical properties of ferroelectric films, particularly, imprint of the polarisation state, are also discussed. (literal)

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