Browsing by Author "García García, José Eduardo"
Now showing items 1-20 of 63
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Applied instrumentation : student works
(Universitat Politècnica de Catalunya, 2021)
Coursework
Open AccessConté els treballs dels estudiants de l'assignatura: Técnicas de diagnóstico por imagen médica activa: PET-TAC / P. Gómez, M. Hérault, X. Povill, R. Pujadas, D. Quiles -- Ultrasons 3D per a la visualització no invasiva del ... -
Applied Instrumentation Student works.
(Universitat Politècnica de Catalunya, 2016)
Coursework
Open Access -
Assessment of the functional properties stability in (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 piezoceramics: huge dielectric and piezoelectric nonlinearity
(2019-02-05)
Article
Open AccessThe (Ba,Ca)(Zr,Ti)O3 ceramic system has received special attention in recent years because it may lead to promising lead-free piezoceramics. However, the stability of the functional properties of these materials is an ... -
Contribution of reversible processes to the non-linear dielectric response in hard lead zirconate titanate ceramics
(2005-10)
Article
Open AccessSe estudia la dependencia entre la constante dieléctrica y las pérdidas con el campo eléctrico aplicado, así como entre la constante dieléctrica y las pérdidas dieléctricas. Los resultados muestran que las cerámicas PZT ... -
Design and characterization of immersion ultrasonic transducers for pulsed regime applications
(2019)
Article
Open AccessUltrasonic transducer design is focused to maximize performance in specific applications, usually leading to a complex design and expensive construction and assembly. With the aim to overcome ... -
Dielectric and mechanical nonlinear behavior of Mn doped PMN-35PT ceramics
(2010-10)
Article
Open AccessThis paper presents an investigation on dielectric and mechanical nonlinear properties in Mn-doped PMN-35PT ceramics. The structural study of the ceramics verifies that the 1% mol Mn doped PMN-35PT is a pure perovskite ... -
Dielectric and piezoelectric nonlinear properties of slightly textured lead barium niobate ceramics
(American Institute of Physics (AIP), 2019-01-09)
Article
Open AccessDielectric and piezoelectric responses of slightly textured, lead barium niobate ceramics are studied. The designed morphotropic phase boundary composition (Pb0.63Ba0.37Nb2O6) shows considerable nonlinear dielectric and ... -
Efeito do dopante Ba sobre as propriedades estruturais e microestruturais de ceramicas Bi0.5Na0.5TiO3
(2015)
Conference report
Restricted access - publisher's policyRecently, Bi0,5Na0,5TiO3 (BNT) based ceramics has been widely studied as one promising material lead-free for piezoelectric applications. The Ba addition in BNT ((Bi0,5Na0,5)1-xBaxTiO3 - BNT-xBT) has attracted considerable ... -
Effect of lanthanide doping on structural, microstructural and functional properties of K0.5Na0.5NbO3 lead-free piezoceramics
(2016-11-15)
Article
Open AccessLanthanides-doped K0.5Na0.5NbO3(KNN) lead-free piezoelectric ceramics are prepared by conventional solid-state reaction. The effects of lanthanum concentration and the lanthanide type on the structure, microstructure and ... -
Effect of Mn-acceptor dopant on dielectric and piezoelectric responses of lead lanthanum zirconate titanate piezoceramics
(2011-08-01)
Article
Restricted access - publisher's policyDielectric and direct piezoelectric responses in non-doped and Mn-doped Pb0.91La0.09(Zr0.65,Ti0.35)O3 ceramics are experimentally studied. The permittivity and the direct piezoelectric coefficient were measured by applying ... -
Effect of the incorporation of BiFeO3 on the structural, electrical and magnetic properties of the lead-free Bi0.5Na0.5TiO3
(2021-11-05)
Article
Open AccessPowders of the system (1–x)Bi0.5Na0.5TiO3–xBiFeO3 (x = 0, 0.02, 0.08, 0.10) are synthesized by the combustion reaction method. The crystal structure and the particle size of Bi0.5Na0.5TiO3 are modified by the incorporation ... -
Effects of poling process on KNN-modified piezoceramic properties
(2010-02)
Article
Restricted access - publisher's policyThe influence of the orthorhombic to tetragonal phase transition near room temperature in the poling process of KNN-modified piezoceramics was studied. Poling temperatures of 25° and 120°C were used. The percentage of 90° ... -
Elastic, dielectric and electromechanical properties of (Bi0.5Na0.5)TiO3-BaTiO3 piezoceramics at the morphotropic phase boundary region
(2017-01-05)
Article
Open AccessA systematic study of the functional properties of the (1-x)(Bi0.5Na0.5)TiO3–xBaTiO3 (BNT-xBT) piezoceramic system for 0.05 = x = 0.07 is performed. The samples are obtained through the conventional solid-state route. The ... -
Enhanced dielectric performance of a block copolymer-polythiophene nanocomposite
(2016-09-15)
Article
Open AccessDielectric elastomer actuators (DEAs) transform electrical energy into mechanical work. However, despite displaying exceptional features, the low permittivity of elastomers restricts their application. Hence, to overcome ... -
Enhancement of piezoelectric properties stability of submicron-structured piezoceramics obtained by spark plasma sintering
(Elsevier, 2018-06-19)
Article
Open AccessGrain-size effect on functional properties of piezoceramics is nowadays an important topic due to the potential applications of these materials at the submicron scale. In this context, we explore the effect of the grain ... -
Evidence for a dynamics crossover and its implication on the freezing temperature determination of relaxor ferroelectrics
(Institute of Physics (IOP), 2019-09-27)
Article
Open AccessRelaxor ferroelectrics are characterized by a broadened and dispersive permittivity peak in their temperature-dependent dielectric spectra. Although several models have been proposed to explain the nature of these materials, ... -
Evidence of temperature dependent domain wall dynamics in hard lead zirconate titanate piezoceramics
(American Institute of Physics (AIP), 2012-07)
Article
Open AccessThis work presents a study of the domain wall dynamics in Pb(Zr1−xTix)O3 (PZT)-based piezoceramics by means of the temperature dependence non-linear dielectric response and hysteresis loop measurements. In soft PZT, ... -
Exploring different sintering atmospheres to reduce nonlinear response of modified KNN piezoceramics
(Elsevier, 2013-04)
Article
Restricted access - publisher's policyDense lead-free (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3 piezoelectric ceramics are prepared by the conventional mixed oxide method. The effect of different sintering conditions (synthetic air, O2 and Ar) on some structural, ... -
Exploring the electromechanical response and electric field-induced dielectric anomalies in PMN–PT electroceramics
(2021-06-23)
Article
Open Access<jats:p> Electromechanical and dielectric properties of PMN–PT ferroelectric ceramics are investigated. In particular, dielectric response studies focus on the investigation of the influence of the DC applied electric field ... -
Extensive domain wall contribution to strain in a (K,Na)NbO3-based lead-free piezoceramics quantified from high energy X-ray diffraction
(Elsevier, 2016-08)
Article
Open AccessThe origins of high piezoelectric properties in the lead-free (K,Na)NbO3-based tetragonal composition (K0.44Na0.52Li0.04)(Nb0.86Ta0.10Sb0.04)O3 (KNL-NTS) is investigated by quantifying the intrinsic and extrinsic contributions ...
