Browsing by Author "Ochoa Guerrero, Diego A."
Now showing items 1-20 of 55
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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 ... -
Concomitant light-reversible magnetic response in multiferroic oxide heterostructures for multiphysics applications
(2024-04-17)
Article
Open AccessThe concept of multiphysics, where materials respond to diverse external stimuli, such as magnetic fields, electric fields, light irradiation, stress, heat, and chemical reactions, plays a fundamental role in the development ... -
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 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 ... -
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 ... -
Estudio de materiales “relaxores”: influencia de los defectos en la estructura perovskita y el carácter “relaxor”
(Servei de Publicacions de la Facultad de Ingeniería Eléctrica de la Universidad de Oriente de Santiago de Cuba (Cuba)., 2015-01-01)
Article
Open AccessEn el trabajo se estudian sistemas ferroeléctricos de circonato titanato de plomo modificado con lantano (PLZT) que presentan un marcado carácter “relaxor”. Estos sistemas presentan características en la respuesta dieléctrica ... -
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, ... -
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 ... -
Extrinsic response enhancement at the polymorphic phase boundary in piezoelectric materials
(2016-04-04)
Article
Open AccessPolymorphic phase boundaries (PPBs) in piezoelectric materials have attracted significant interest in recent years, in particular because of the unique properties that can be found in their vicinity. However, to fully ... -
Fine-grained high-performance Ba0.85Ca0.15 Zr0.1Ti0.9O3 piezoceramics obtained by current-controlled flash sintering of nanopowders
(Elsevier, 2023-12)
Article
Open AccessDue to environmental concerns, extensive research has been carried out to develop high-performance lead-free piezoceramics capable of replacing commercial lead-based materials. The lead-free (Ba0.7Ca0.3)TiO3 -Ba(Zr0.2Ti0.8)O3 ... -
Flash sintering of potassium-sodium niobate-based piezoceramics: refining (micro)structure for properties enhancement
(Elsevier, 2024-08)
Article
Restricted access - publisher's policyLow-consumption ceramics processing routes are expected to replace conventional ones due to environmental concerns. In this context, flash sintering is garnering interest because it allows dense ceramics to be obtained in ... -
Growth and physical properties of highly oriented La-doped (K,Na)NbO3 ferroelectric thin films
(2015-02-27)
Article
Open AccessLead-free (K,Na)NbO3 (KNN) and La doped (K,Na)NbO3 (KNN-La) thin films are grown on SrTiO3 substrates using the chemical solution deposition method. The effect of adding different amounts of Na and K excess (0-20 mol%) is ...
