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Thickness-dependent piezoelectric behaviour and dielectric properties of lanthanum modified BiFeO3 thin films

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Author(s): Glenda Biasotto | Francisco Moura | Cesar Foschini | Elson Longo | Jose A. Varela | Alexandre Z. Simões

Journal: Processing and Application of Ceramics
ISSN 1820-6131

Volume: 5;
Issue: 1;
Start page: 31;
Date: 2011;
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Keywords: Thin films | Oxides | Chemical syntheses | Piezoelectricity

ABSTRACT
Bi0.85La0.15FeO3 (BLFO) thin films were deposited on Pt(111)/Ti/SiO2 /Si substrates by the soft chemical method. Films with thicknesses ranging from 140 to 280 nm were grown on platinum coated silicon substrates at 500°C for 2 hours. The X-ray diffraction analysis of BLFO films evidenced a hexagonal structure over the entire thickness range investigated. The grain size of the film changes as the number of the layers increases, indicating thickness dependence. It is found that the piezoelectric response is strongly influenced by the film thickness. It is shown that the properties of BiFeO3 thin films, such as lattice parameter, dielectric permittivity, piezoeletric coefficient etc., are functions of misfit strains.
Affiliate Program     

Tango Jona
Tangokurs Rapperswil-Jona