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Ferroelectric properties of heteroepitaxial PbTiO3 and PbZr1–xTixO3 films on Nb-doped SrTiO3 fabricated by hydrothermal epitaxy below Curie temperature

Published online by Cambridge University Press:  03 March 2011

S.H. Han ,
W.S. Ahn ,
H.C. Lee  and
S.K. Choi
S.H. Han
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yuseong Gu, Daejeon, Republic of Korea 305-701
W.S. Ahn
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yuseong Gu, Daejeon, Republic of Korea 305-701
H.C. Lee
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yuseong Gu, Daejeon, Republic of Korea 305-701
S.K. Choi*
Affiliation:
Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Yuseong Gu, Daejeon, Republic of Korea 305-701
*
a) Address all correspondence to this author. e-mail: sikchoi50@kaist.ac.kr
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Abstract

PbTiO3 (PTO) and PbZr1-xTixO3 (PZT) films on a (100) Nb-doped SrTiO3 (NSTO) substrate were fabricated at 160 and 210 °C, respectively, by hydrothermal epitaxy below the Curie temperature, TC. The PTO capacitor had a square hysteresis curve compared to the rounded hysteresis curve of the PZT capacitor. These differing behaviors in the polarization-electric hysteresis curves can be explained by the existence of an interfacial layer formed between the PZT film and the NSTO substrate. The PZT capacitor showed almost no polarization fatigue after 1011 switching cycles. However, the PTO capacitor revealed a slightly different fatigue behavior due to the microvoids that formed as a result of the agglomeration of the island growth mode. However, the fatigue behavior of both capacitors revealed that defects, such as the lead or oxygen vacancies, were suppressed by the hydrothermal epitaxy using a very low fabrication temperature below TC.

Keywords

FatigueFerroelectricHydrothermal
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 4 , April 2007 , pp. 1037 - 1042
Copyright
Copyright © Materials Research Society 2007

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