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Piezoelectric effect in epitaxial PbZr1−xTixO3 thin films near morphotropic phase boundary region

Published online by Cambridge University Press:  01 April 2005

Yong Kwan Kim ,
Sang Sub Kim ,
Bongki Lee ,
Hyunjung Shin  and
Sunggi Baik
Yong Kwan Kim
Affiliation:
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
Sang Sub Kim
Affiliation:
Dept. of Materials Science and Engineering, Chonnam National University, Gwangju 500-757, Korea
Bongki Lee
Affiliation:
School of Advanced Materials Engineering, Kookmin University, Seoul 136-702, Korea
Hyunjung Shin
Affiliation:
School of Advanced Materials Engineering, Kookmin University, Seoul 136-702, Korea
Sunggi Baik*
Affiliation:
Department of Materials Science and Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea
*
a) Address all correspondence to this author. e-mail: sgbaik@postech.edu
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Abstract

The relationship between crystal structure and piezo-response was investigated in epitaxially grown PbZr1−xTixO3 (PZT) thin films on Pt(001)/MgO(001) with a thin PbTiO3 interlayer. Insertion of the interlayer resulted in significant relaxation ofthe strain that could be developed in the course of deposition of the PZT films, consequently leading us to single out only the effect of composition. Composition of the morphotropic phase boundary (MPB), at which tetragonal and rhombohedral phases are mixed with the same volume fraction, was found to be ∼0.55 in Ti/(Zr + Ti) ratio in our films, which is close to the value for bulk polycrystalline PZT (∼0.50). The piezoelectric response peaks were two times higher in the MPB regime than in the single phase regime due to structural instability caused by the coexistence of two phases. The results indicate that epitaxial PZT films having the MPB composition are advantageous over those of other compositions for nano-storage devices based on scanning force microscopy.

Keywords

PiezoelectricPulsed laser deposition (PLD)Thin film
Type
Rapid Communication
Information
Journal of Materials Research , Volume 20 , Issue 4 , April 2005 , pp. 787 - 790
Copyright
Copyright © Materials Research Society 2005

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