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Noncentrosymmetric phase of submicron NaNbO3 crystallites

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Abstract

The temperature and pressure characteristics of a noncentrosymmetric crystal modification of NaNbO3 were studied by Raman spectroscopy. A transition towards the bulk-like structure of NaNbO3 occurs in the temperature range from 280 to 360 °C. High-pressure Raman spectroscopy revealed successive pressure-induced phase transitions at around 2, 6.5 and 10 GPa. Raman scattering profiles recorded above 7 GPa correspond to those reported for the bulk. The temperature-induced spectral changes were completely reversible between −150 and 450 °C. Those induced by pressure were almost reversible from ambient pressure up to 15.9 GPa. Piezoresponse force microscopy demonstrated the occurrence of piezoelectric activity for submicron NaNbO3 crystals with particle size ranging from 200 to 400 nm. The noncentrosymmetric crystallographic structure plays a critical role for the enhancement of piezoelectricity.

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Acknowledgements

One of the authors (Y.S.) sincerely acknowledges the Alexander von Humboldt Foundation (Bonn, Germany) for granting financial support through a Research Fellowship. We gratefully thank Dr. Jürgen Dornseiffer (Institut für Chemie und Dynamik der Geosphäre II, Forschungszentrum Jülich GmbH, Jülich, Germany) and Dr. Franz-Hubert Haegel (NanDOx, Germany) for powder synthesis and Mr. Jochen Friedrich (Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, Jülich, Germany) for SEM studies.

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  1. Y. Shiratori

    Present address: Department of Chemical System Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan

Authors and Affiliations

  1. Institut für Elektronische Materialien, Institut für Festkörperforschung (IFF), Forschungszentrum Jülich GmbH, 52425, Jülich, Germany

    Y. Shiratori, S. Röhrig, F. Peter, C. Pithan & R. Waser

  2. Laboratoire des Nanostructures et des Nouveaux Matériaux Electroniques (LNNME), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne-EPFL, Switzerland

    A. Magrez

  3. Department of Applied Chemistry, Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga, 525-8577, Japan

    K. Kasezawa & M. Kato

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  1. Y. Shiratori
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  2. A. Magrez
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  3. K. Kasezawa
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  8. R. Waser
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Correspondence to Y. Shiratori.

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Shiratori, Y., Magrez, A., Kasezawa, K. et al. Noncentrosymmetric phase of submicron NaNbO3 crystallites. J Electroceram 19, 273–280 (2007). https://doi.org/10.1007/s10832-007-9032-7

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  • DOI: https://doi.org/10.1007/s10832-007-9032-7

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