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Improvement of Ferroelectric Properties of Lead Zirconate Titanate Thin Films by Ion-substitution using Rare-earth Cations

Published online by Cambridge University Press:  01 February 2011

Hiroshi Nakaki
Affiliation:
Department of Chemistry, Faculty of Science and Technology, Sophia University, 7–1 Kioi-cho, Chiyoda-ku, Tokyo, 102–8554, Japan
Hiroshi Uchida
Affiliation:
Department of Chemistry, Faculty of Science and Technology, Sophia University, 7–1 Kioi-cho, Chiyoda-ku, Tokyo, 102–8554, Japan
Shoji Okamoto
Affiliation:
Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226–8502, Japan
Shintaro Yokoyama
Affiliation:
Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226–8502, Japan
Hiroshi Funakubo
Affiliation:
Department of Innovative and Engineered Materials, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226–8502, Japan
Seiichiro Koda
Affiliation:
Department of Chemistry, Faculty of Science and Technology, Sophia University, 7–1 Kioi-cho, Chiyoda-ku, Tokyo, 102–8554, Japan
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Abstract

Rare-earth-substituted tetragonal lead zirconate titanate thin films were synthesized for improving the ferroelectric property of conventional lead zirconate titanate. Thin films of Pb1.00REx (Zr0.40Ti0.60)1-(3x /4)O3 (x = 0.02, RE = Y, Dy, Er and Yb) were deposited on (111)Pt/Ti/SiO2/(100)Si substrates by a chemical solution deposition (CSD). B-site substitution using rare-earth cations described above enhanced the crystal anisotropy, i.e., ratio of PZT lattice parameters c/a. Remanent polarization (Pr) of PZT film was enhanced by Y3+-, Dy3+- and Er3+-substitution from 20 μC/cm2 up to 26, 25 and 26 μC/cm2 respectively, while ion substitution using Yb3+ degraded the Pr value down to 16 μC/cm2. These films had similar coercive fields (Ec) of around 100 kV/cm. Improving the ferroelectric property of PZT film by rare-earth-substitution would be ascribed to the enhancement of the crystal anisotropy. We concluded that ion substitution using some rare-earth cations, such as Y3+, Dy3+ or Er3+, is one of promising technique for improving the ferroelectric property of PZT film.

Type
Research Article
Copyright
Copyright © Materials Research Society 2005

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References

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Improvement of Ferroelectric Properties of Lead Zirconate Titanate Thin Films by Ion-substitution using Rare-earth Cations
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