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Structural and Dielectric Properties of Pulsed Laser Deposited Pb[Yb1/2Nb1/2]O3-PbTiO3 Thin Films

Published online by Cambridge University Press:  10 February 2011

Véronique Bornand  and
Susan Trolier-McKinstry
Véronique Bornand
Affiliation:
current address: Laboratoire de Physicochimie de la Matière Condensée UMR 5617, C.C. 003, Place Eugène Bataillon, 34095 MONTPELLIER Cédex 5, France
Susan Trolier-McKinstry
Affiliation:
The Pennsylvania State University, Department of Materials Science and Engineering, Materials Research Laboratory, University Park, PA 16802-4801
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Abstract

Heterostructures consisting of (001) LaAlO3 or (111) SrTiO3 substrates, SrRuO3 metallic oxide bottom electrodes and Pb[Yb1/2Nb1/2]O3-PbTiO3 ferroelectric films were deposited by pulsed laser deposition. The combination of oxidic perovskite-type materials results in highly <001>- or <111>-heteroepitaxial capacitors with well-defined and homogeneous columnar microstructures. Most of the films show room temperature dielectric constant greater than 1500 associated with low dielectric loss (tgδ < 4%) and exhibit saturated hysteresis loops with remanent polarizations up to Pr ∼ 50µC.cm−2. It was found that the ferroelectric characteristics and, in particular, the fatigue phenomena greatly depend on the orientation and crystalline quality of the as-grown films. The stabilization of the <001>-orientation enhances the fatigue resistance and a good endurance up to 1011 cycles has been determined for highly <001>-textured samples. In contrast, fatigue tests performed on strongly <111>-oriented capacitors have revealed poor fatigue performances, with a progressive decrease in the switchable polarization by ac voltage cycling.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 603: Symposium KK – Materials Issues for Tunable RF & Microwave Devices , 1999 , 143
Copyright
Copyright © Materials Research Society 2000

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