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Article
Phosphor-doped BaTiO3: Microstructure development and dielectric properties
The phosphor cation retards BaTiO3 formation during the first reaction stage, and favours Ba2TiO4 formation. As a consequence, the end of the reaction is only accomplished at 1150 °C. The average particle size of...
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Article
Improving sintering behaviour of BaTiO3 by small do** additions
The dielectric properties of BaTiO3 ceramics are associated with its microstructure, which depends on the stoichiometric ratio, dopant nature, and ceramic processing. Optimum densification at low temperatures to ...
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Article
Ceramic–electrode interaction in PZT and PNN–PZT multilayer piezoelectric ceramics with AG/PD 70/30 inner electrode
Pb(Zr0.53Ti0.47)O3(PZT) and PbNi1/3Nb2/3O3-PZT (PNN–PZT) multilayers with Ag/Pd 70/30 inner electrodes have been studied from the point of view of the ceramic–electrode interaction. PZT multilayers have shown ...
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Article
Effects of PbO excess in Pb(Mg1/3Nb2/3)O3–PbTiO3 ceramics: Part I. Sintering and dielectric properties
The influence of the presence of free PbO on densification, the perovskite/pyrochlore phase ratio, and corresponding dielectric properties has been studied for 0.9 PMN–0.1 PT-based ceramics with different adde...
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Article
Effects of PbO excess in Pb(Mg1/3Nb2/3)O3–PbTiO3 ceramics: Part II. Microstructure development
The microstructure evolution of Pb(Mg1/3Nb2/3)O3 –PbTiO3 (PMN-PT) based ceramics has been investigated to determine the influence of the presence of PbO content in excess of stoichiometric values. The microstruct...
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Article
Effect of humidity on the electrical response of porous BaTiO3 ceramics
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Chapter
Bi4Ti3O12-Based Piezoelectric Ceramics for High Temperature Applications
High temperature piezoelectric ceramics based on WO3-doped Bi4Ti3O12 (WBIT) were prepared by two ways: chemical (hydroxide coprecipitation) and conventional oxides mixing. Sintering was carried out between 800°-1...
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Article
Electrical Properties of Bismuth Titanate Based Ceramics with Secondary Phases
Bi4Ti3O12 (BIT) based ceramics were prepared by hydroxide coprecipitation method and subsequent treatment at 650∘C for 1 h. Calcined BIT was doped with different amounts of WO3 by surface do** using W(C2H5O)6. ...
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Article
Bulk Grain Resistivity of ZnO-Based Varistors
We study the temperature dependence of grain resistivity in ZnO ceramic varistors (300–430 K), finding a positive temperature coefficient (PTC). We devise a high-frequency procedure that allow us to obtain the...
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Article
Thermal evolution of ZnO-Bi2O3-Sb2O3 system in the region of interest for varistors
In facing the design of new processing strategies for ZnO based ceramic varistors, a precise control of its microstructural development during sintering is demanded. Addition of dopants to zinc oxide results i...
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Article
Preparation and properties of Bi6Ti5WO22: a new phase in the Bi2O3–TiO2–WO3 system
In a recent report, the evaluation of the phase relations in the Bi2O3–TiO2–WO3 ternary system has shown the existence of a new phase with nominal composition close to Bi6Ti5WO22. In the present contribution we a...
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Article
Preparation and characterization of stable aqueous suspensions of up-converting Er3+/Yb3+-doped LiNbO3 nanocrystals
The preparation of LiNbO3:Er3+/Yb3+ nanocrystals and their up-conversion properties have been studied. It is demonstrated that polyethyleneimine- (PEI) assisted dispersion procedures allow obtaining stable aqueou...
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Article
Results of R-ESHAP as salvage therapy in refractory/relapsed follicular lymphoma: a real-world experience on behalf of GELCAB group
There is no standard treatment for relapsed follicular lymphoma (FL). Although platinum-based combinations are one of the most used treatments, few data have been reported in this setting. Our aim was to analy...
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Article
Diagnostic delay and outcome in immunocompetent patients with primary central nervous system lymphoma in Spain: a multicentric study
To assess the management of immunocompetent patients with primary central nervous system lymphomas (PCNSL) in Spain.