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Ni/NiO nanopowders have been prepared by using thermal decomposition of aqua solutions of nickel acetate ammine complexes in air at the annealing temperature range 300–500 °C and time of decomposition from 30 to 180 min. Particle size of powders has been investigated with transmission electron microscopy (TEM) and scanning electron microscopy (SEM). Powders pore structure has been determinated with...
This article reports a new method to cover powder substrates with metallic nanoparticles (NPs) via an electro-magnetic vibrational device adapted to magnetron sputtering equipment. In the present work, it is presented the deposition of Cu, Au, Ni and Pd over three different substrates, Al2O3, SBA15 and Lipase, each one with particular parameters. The size and homogeneity of the NPs deposited with...
SOFC composite materials were prepared from nanopowder mixtures of yttria stabilized zirconia - nickel oxide as anode and yttria stabilized zirconia - lanthanum manganite as cathode. The influence of particle size, pore former and sintering temperature on structure and properties of the electrode materials were investigated. The optimal conditions of full reduction of nickel oxide in anode materials...
TiO2 nanoparticles with different quantity Ni doping were synthesized by hydrothermal process. XRD, SEM, BET were used to characterize the crystal phase and micro-topography of samples. Besides, combining with mathematic morphology and fractal theory, the data of characterition were analyzed, the distribution and evolution of the microstructure of samples were discussed as well in this paper. The...
In the present study, the effect of nickel nanoparticle doping on the dielectric properties of lead bismuth niobate zirconate titanate, P(BN)ZT solid solution were investigated. P(BN)ZT powder doped with nickel in the composition of (1-x) PBNZT-xNi when x = 0.00, 0.02, 0.04, 0.06, 0.08 and 0.1 percent by mole. P(BN)ZT doped with nickel powder were calcined at 900??C for 2 h and sintered at the temperature...
Possibilities of the method of obtaining metal powders by means of thermal decomposition (or reduction) of their compounds during heating in a medium of a high-boiling organic liquid were investigated. A distinguishing feature of the approach proposed is the use of benzyl alcohol as the liquid medium, while the initial metal carboxylates with different lengths of the methylene chain were formates,...
We report thermoelectric characterization of Bi2-xSbxTe3 (x = 0.5, 1.0, and 1.5) synthesized by a solvothermal method using DMF as solvent. For Bi2Te3, the size of the edge and thickness of the hexagonal nanoplatelets are 200-250 nm and 20-25 nm, respectively. Bi2Te3 nanosheets appear to grow epitaxially from the surface of the Te tubes, which forms in the first step and acts as the template for the...
Bulk nanostructured (Bi,Sb)2Te3 compounds and GeTe based amorphous/nanocrystal composites have been successfully fabricated by the combined hydrothermal/hot-pressing and quenching/annealing methods, respectively. The (Bi,Sb)2Te3 nanopowders synthesized by hydrothermal method exhibit a hollow-like structure. After hot-pressing, the nanoscale grains varying from tens to hundreds of nanometers were found...
Nanostructuring is one of the effective approaches to lower the thermal conductivity of materials. Nanostructured skutterudite-related compounds CoSb3, Fe0.5Ni0.5Sb3, Fe0.25Ni0.25Co0.5Sb3 and Te-doped CoSb3 were synthesized by a solvothermal route. The bulk materials were prepared by hot pressing or spark plasma sintering from the solvothermally synthesized nanopowders. The thermal conductivity values...
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