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PIEZOELECTRIC MULTILAYER COMPOSITE THIN FILMS BASED ON Pb(Mg1/3Nb2/3)O3–PbTiO3: PREPARATION AND CHARACTERIZATION

AutorHaitham El Hosiny, Ali Mohammed
Palabras clavePiezoelectric
Multilayer
Film
Composite
Fecha de publicación27-may-2013
ResumenThe ferroelectric composition (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMNT), close to the morphotropic phase boundary (MPB) at x=0.35, has excellent piezoelectric coefficients in single-crystals and bulk ceramics. However, in thin film form, it has been reported that the remnant properties of PMNT are reduced as compared to those of the corresponding bulk materials. Nevertheless, in the ferroelectric loops the polarization saturation values remain close to those obtained in bulk ceramics, which implies that the problem relies on the decrease of the remnant polarization values in the thin films. In this doctoral thesis the principles traditionally used in bulk composites are followed. The combination of layers with different ferroelectric compositions in a multilayer composite (MLC) configuration has proved to be successful to improve the dielectric and ferroelectric (remnant) properties when compared to those of the individual layers. Based on this idea, this thesis explores the preparation and characterization of piezoelectric multilayer composite films based on Pb(Mg1/3Nb2/3)O3–PbTiO3, with the objective of finding a solution to the limitations found in thin film form with the remnant piezoelectric coefficients.
URIhttp://hdl.handle.net/10261/76895
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