Nuestros investigadores

Mikel Azcona Calero

Publicaciones científicas más recientes (desde 2010)

Autores: Gabilondo, M.; Fraile, I. , (Autor de correspondencia); Burgos, Nerea; et al.
ISSN 0272-8842  Vol. 45  Nº 17  2019  págs. 23149 - 23156
Piezoelectric materials are used in several applications, including sensors and actuators. Perovskite type ferroelectrics, specially, lead zirconate titanate (PZT), due to its excellent dielectric, piezoelectric and ferroelectric properties are usually employed. In this work, a series of Spin Coated PZT thick films were deposited on alumina and stainless steel substrates. These PZT-based films were obtained using inks containing either pArtículos or a precursor that were synthesised using a chemical method. In order to consolidate the deposit as a thick film, a thermal treatment is required after deposition on a substrate. Under temperature exposure, the PZT pArtículos tend to sinter after the elimination of the organic vehicle. Moreover, the PZT precursor transforms to crystalline PZT. Films based on the PZT precursor exhibited many cracks after treatment, while those constituted by PZT pArtículos required sintering temperatures higher than 1000 degrees C which resulted in unstable PZT structures. As an alternative, slurries forming mixtures of PZT precursor and pArtículos, varying their relative proportions, were studied to improve the properties of the films. Films generated in this study were characterized by SEM and X-ray diffractometry.
Autores: Fraile, Itziar, (Autor de correspondencia); Gabilondo, Maitane; Burgos, Nerea, (Autor de correspondencia); et al.
ISSN 0272-8842  Vol. 44  Nº 13  2018  págs. 15603 - 15610
Lead zirconate titanate (PZT) Pb(ZrxTi1-x)O-3 is one of the most studied perovskite type ferroelectric materials due to its excellent dielectric, piezoelectric and ferroelectric properties. PZT particles and a PZT precursor were synthesized using a chemical method. A vehicle was added to the synthesized particles and precursor for obtaining two inks with appropriate rheological properties to be printed by Inkjet Printing. The use of an 80 mu m diameter nozzle made necessary the utilization of an energetic ball milling for assuring the dispersion of small PZT particles in the ink. After ball milling nanoparticles of 150 nm diameter were obtained. These inks were deposited on alumina and steel substrates followed by sintering using a pulsed laser of 1064 nm wavelength. The work shows the effect laser sintering has on, both inks, the one containing PZT nanoparticles and that one based on the PZT precursor. Laser processing was optimized in order to generate suitable films to be subsequently poled. The effect of poling on these films was also studied and their piezoelectric properties were measured by a compression test. The microstructural characteristics of these films were obtained by SEM and X ray diffractometry.