5 Result(s)
within
J. DE FRUTOS
Characterization and Evaluation of Materials
Optical and Electronic Materials
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Article
The influence of area/volume ratio on microstructure and non-Ohmic properties of SnO2-based varistor ceramic blocks
This work deals with the electrical properties of SnO2-based varistor systems with different area–volume (A/V) ratio of the green compact. The influence of A/V ratio specially on microstructural homogeneity and d...
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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
Non-uniform distribution of polarization in Pb0.76Ca0.24(Co0.5W0.5)0.05Ti0.95O3 ceramics produced by defects
Polarization distribution of calcium-modified lead titanate ceramics with a nominal composition of Pb0.76Ca0.24(Co0.5W0.5)0.05Ti0.95O3 was measured from the thermocurrents stimulated in these materials by a sinus...
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Article
Non-stoichiometric lead titanate ceramics prepared by a wet-chemical processing
A wet-chemical method with an initial 1:1 molar ratio of lead to titanium was used for the preparation of non-stoichiometric lead titanate ceramics. Studies were made of the physicochemical evolution of this s...
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Article
Chemical processing and microstructure of piezoelectric lead titanate ceramics
Lead titanate-based ceramics with different microstructures were prepared from PbO-TiO2 gels with equimolar and non-equimolar mixtures of the oxides. Deviations from the initial compositions were found in the sin...
