Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17009
Title: Substrate effect on in-plane ferroelectric and dielectric properties of Ba0.7Sr0.3TiO3 thin films
Authors: Wang, DY
Wang, Y 
Dai, JY 
Chan, HLW 
Choy, CL 
Keywords: BST thin films
IDE
In-plane ferroelectric properties
Issue Date: 2006
Publisher: Springer
Source: Journal of electroceramics, 2006, v. 16, no. 4, p. 587-591 How to cite?
Journal: Journal of electroceramics 
Abstract: Heteroepitaxial Ba0.7Sr0.3TiO3 thin films were grown on (LaAlO3)0.3(Sr2AlTaO 6)0.35 (001) (LSAT) and SrTiO3 (001) (STO) single crystal substrates using pulsed laser deposition (PLD). X-ray diffraction characterization revealed a good crystallinity and a pure perovskite structure for films grown on both LSAT and STO substrates. The in-plane ferroelectric and dielectric properties of the films were studied using interdigital electrodes (IDE). The film grown on LSAT substrate exhibited an enhanced in-plane ferroelectricity, including a well-defined P-E hysteresis loop with the remnant polarization P r = 10.5 μC/cm2 and a butterfly-shaped C-V curve. Nevertheless, only a slim hysteresis loop was observed in the film grown on STO substrate. Curie temperature T c of the film grown on LSAT substrate was found to be ∼105°C, which is nearly 70°C higher than that of the bulk Ba0.7Sr0.3TiO3 ceramics. T c of the film grown on STO substrate has almost no change compared to the bulk Ba0.7Sr0.3TiO3 ceramics. The dielectric tunabilities were found to be 64% and 52% at 1 MHz for the films grown on LSAT and STO substrates, respectively.
URI: http://hdl.handle.net/10397/17009
ISSN: 1385-3449
EISSN: 1573-8663
DOI: 10.1007/s10832-006-9924-y
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