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Influence of the common varistor dopants (CoO, Cr2O3 and Nb2O5) on the structural properties of SnO2 ceramics
(Elsevier Science Inc, New York, 2004)
The influence of dopants commonly used in SnO2 varistor ceramics, such as CoO, Cr2O3 or Nb2O5, on the structural properties of SnO2 was investigated. Several SnO2-based ceramics containing only one of the dopants were ...
Nanostructured sodium niobate obtained by glass crystallization
(Elsevier Science Sa, Lausanne, 2004)
The subject of this work was to obtain nanostructured sodium niobate crystals by a controlled crystallization method from glasses. The glass samples of the composition within the system NaNbO3-SiO2-Al2O3 were prepared by ...
Structural analysis of abrasive composite materials with nonwoven textile matrix
(Elsevier B.V., 2004)
The goal of this research was to design the novel composite material based on nonwoven textile material (NTM) while using the existing production facilities. The chosen product was abrasive composite material with nonwoven ...
Methyl methacrylate and acrylamide crosslinked macroporous copolymers
(Journal of Applied Polymer Science, 2004)
In this work the synthesis of a crosslinked macroporous copolymer was effected from methyl methacrylate and acrylamide. The synthesis process began with emulsion prepolymerization, followed by sol-gel copolymerization until ...
Characterization of carbon cryogel synthesized by sol-gel polycondensation and freeze-drying
(Carbon, 2004)
Resorcinol-formaldehyde (RF) cryogels were synthesized by sol-gel polycondensation of resorcinol with formaldehyde and freeze-drying was carried out with t-butanol. Carbon cryogels were obtained by pyrolyzing RF cryogels ...
Dielectric and piezoelectric properties of the mechanochemically prepared PZT ceramics
(Kluwer Academic Publishers, 2004)
Mechanochemical synthesis was applied to obtain nanocrystalline powders of composition Pb(Zr0.52Ti0.48)O-3 (PZT). Milling was performed in a planetary ball mill using vials and balls made of zirconia or steel-in order to ...
Electrochemically deposited Ni+WC composite coatings obtained under constant and pulsating current regimes
(Netherlands : Kluwer Academic Publishers, 2004)
A series of Ni+WC composite coatings were obtained by electrodeposition on a rotating disc electrode (RDE)from a commercially available Watts bath containing additives for brightness and smoothing and insoluble WCparticles, ...
Heavy metals in petroleum-contaminated surface soils in Serbia
(Societa Chimica Italiana, 2004)
Investigation of heavy metal contamination levels as well as their association types with substrates in petroleum-contaminated surface soil was carried out using modified sequential extraction method. In that way, ...
Underpotential deposition of hydrogen on MoPt 4 intermetallic phase in acid solution: Temperature dependence
(Elsevier Ltd, 2004)
Potentiodynamic studies of the underpotential deposition of hydrogen (H upd ) on MoPt 4 electrode in 0.5 mol dm -3 HClO 4 aqueous solution in the range of temperature from 275 to 312 K are made and thermodynamic state ...