Publication

Sol-gel processing of PNZST thin films on Ti/Pt and Ta/Pt metallizations

Nava Setter, Nicolas Xanthopoulos
1997
Journal Articles

Abstract

Sol-gel processing parameters of Pb0.99Zr0.55Sn0.37Ti0.06Nb0.02O3 thin films were studied. Effects of H2O, HNO3 and formamide additives on solution gelation and film properties were investigated. Thin films were prepared on Ti/Pt and Ta/Pt metallized Si substrates. Film microstructures were characterized using SEM, TEM/EDS and XPS. Film microstructures typically contained 'rosette' structures. Strain response of the films under applied electric fields was measured using a double beam interferometer. A piezoelectric double loop was obtained with an effective d(33) as high as 60 pm V-1, being strongly AC field dependent. Double P-E hysteresis loops with maximum polarizations of 30 mu C cm(-3) were measured. Field-induced antiferroelectric to ferroelectric phase switching was observed at 110 kV cm(-1) and reverse switching at 74 kV cm(-1). films prepared on Ti/Pt yielded better electrical properties. This may attributed to a change in nucleation/crystallization mechanism due to Pb diffusion through the Pt during film annealing. (C) 1996 Elsevier Science Limited.

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https://infoscience.epfl.ch/entities/publication/d5b2bcad-d6a8-4962-bc06-9bc24f66f6c4

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Nava Setter, Nicolas Xanthopoulos
1997
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/d5b2bcad-d6a8-4962-bc06-9bc24f66f6c4

About this result

Related concepts (32)

Ferroelectricity

Ferroelectricity is a characteristic of certain materials that have a spontaneous electric polarization that can be reversed by the application of an external electric field. All ferroelectrics are also piezoelectric and pyroelectric, with the additional property that their natural electrical polarization is reversible. The term is used in analogy to ferromagnetism, in which a material exhibits a permanent magnetic moment. Ferromagnetism was already known when ferroelectricity was discovered in 1920 in Rochelle salt by Joseph Valasek.

Sol–gel process

In materials science, the sol–gel process is a method for producing solid materials from small molecules. The method is used for the fabrication of metal oxides, especially the oxides of silicon (Si) and titanium (Ti). The process involves conversion of monomers into a colloidal solution (sol) that acts as the precursor for an integrated network (or gel) of either discrete particles or network polymers. Typical precursors are metal alkoxides. Sol-gel process is used to produce ceramic nanoparticles.

Gel

A gel is a semi-solid that can have properties ranging from soft and weak to hard and tough. Gels are defined as a substantially dilute cross-linked system, which exhibits no flow when in the steady-state, although the liquid phase may still diffuse through this system. A gel has been defined phenomenologically as a soft, solid or solid-like material consisting of two or more components, one of which is a liquid, present in substantial quantity.

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Sol-gel processing of PNZST thin films on Ti/Pt and Ta/Pt metallizations

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