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Dielectric Properties of Ba1−xSxTiO3 Films Grown on LaAlO3 Substrates

Published online by Cambridge University Press:  10 February 2011

Y. Gim ,
T. Hudson ,
Y. Fan ,
A. T. Findikoglu ,
C. Kwon ,
B. J. Gibbons  and
Q. X. Jia
Y. Gim
Affiliation:
Superconductivity Technology Center, MS-K763, Los Alamos National Laboratory, NM 87545
T. Hudson
Affiliation:
Superconductivity Technology Center, MS-K763, Los Alamos National Laboratory, NM 87545
Y. Fan
Affiliation:
Superconductivity Technology Center, MS-K763, Los Alamos National Laboratory, NM 87545
A. T. Findikoglu
Affiliation:
Superconductivity Technology Center, MS-K763, Los Alamos National Laboratory, NM 87545
C. Kwon
Affiliation:
Department of Physics and Astronomy, California State University-Long Beach, CA 90840
B. J. Gibbons
Affiliation:
Superconductivity Technology Center, MS-K763, Los Alamos National Laboratory, NM 87545
Q. X. Jia
Affiliation:
Superconductivity Technology Center, MS-K763, Los Alamos National Laboratory, NM 87545
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Abstract

We report the crystal structures and dielectric properties of barium strontium titanate, Ba1−xSrxTiO3 (BST), films deposited on LaAlO3 substrates using pulsed laser deposition, where x = 0.1 to 0.9 at an interval of 0.1. We have found that when x < 0.4 the c-axis is parallel to the plane of the substrate but normal as x approaches 1. Temperature-dependent capacitance measurements at 1 MHz show that the capacitance has a peak and that the peak temperature decreases with increasing x. We have found that the peak temperatures of the films are about 70 °C higher than those of bulk BSTs when x < 0.4. From room-temperature capacitance (C) vs applied voltage (V) measurements, we have found that the C-V curves of the BST films exhibit hysteresis except for x = 0.9 and that the peak voltage at which the capacitance becomes maximum decreases with increasing x. At room temperature, the Ba0.6Sr0.4 TiO3 film exhibits the largest capacitance tunability (≈ 37%) with an applied electric field of 40 kV/cm.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 603: Symposium KK – Materials Issues for Tunable RF & Microwave Devices , 1999 , 175
Copyright
Copyright © Materials Research Society 2000

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