Centro Universitario FEI: Recent submissions
Itens para a visualização no momento 1281-1300 of 2258
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Microscale meshes of Ti3O5 nano- and microfibers prepared via annealing of C-doped TiO2 thin films
(2011)A new technique to produce microscale Ti3O5 nano- and microfiber meshes is proposed. When a 3 wt% carbon-doped TiO2 film on Si(1 0 0) was annealed at 1000 °C in wet nitrogen (0.8%H2O), the amorphous TiO2 phase gave rise ... -
Metal-insulator transition in Nd1-x Eux NiO 3 probed by specific heat and anelastic measurements
(2011)Oxides RNiO3 (R=rare-earth, R≠La) exhibit a metal-insulator (MI) transition at a temperature TMI and an antiferromagnetic (AF) transition at TN. Specific heat (CP) and anelastic spectroscopy measurements were performed in ... -
Anelastic spectroscopy study of the metal-insulator transition of Nd 1-xEuxNiO3
(2011)Measurements are presented of the complex dynamic Young's modulus of NdNiO3 and Nd0.65Eu0.35NiO3 through the metal-insulator transition (MIT). Upon cooling, the modulus presents a narrow dip at the MIT followed by an abrupt ... -
Metal-insulator transition in Nd1-xEuxNiO 3 compounds
(2006)Polycrystalline Nd1-xEuxNiO3 (0≤x≤0.5) compounds were synthesized in order to investigate the character of the metal-insulator (MI) phase transition in this series. Samples were prepared through the sol-gel route and ... -
Metal-insulator transition in Nd1-xEuxNiO3: Entropy change and electronic delocalization
(2015)© 2015 AIP Publishing LLC.The metal-insulator (MI) phase transition in Nd1-xEuxNiO3, 0 ≤ x ≤ 0.35, has been investigated through the pressure dependence of the electrical resistivity ρ(P, T) and measurements of specific ... -
Magnetic properties of Fe3 O4 nanoparticles coated with oleic and dodecanoic acids
(2010)Magnetic nanoparticles (NP) of magnetite (Fe3 O4) coated with oleic acid (OA) and dodecanoic acid (DA) were synthesized and investigated through transmission electron microscopy (TEM), magnetization M, and ac magnetic ... -
Spin-wave fluctuations in ferrimagnetic Mgx Fe3-x O4 nanoparticles
(2010)We have performed a systematic study of the magnetic properties of a series of ferrimagnetic nanoparticles of Mgx Fe3-x O4 (0.8times;1.5) prepared by the combustion reaction method. The magnetization data can be well fitted ... -
Magnetothermopower in Nd1-xEuxNiO3 compounds
(2007)We have measured magnetization M (T,H), thermal conductivity κ (T,H), and thermopower S (T,H) of polycrystalline samples of Nd1-x Eux Ni O3, 0≤x≤0.35, as a function of temperature and external magnetic field. The data ... -
Structure, magnetism, and transport of single-crystalline RNiSi3 (R = Y, Gd-Tm, Lu)
(2018)© 2018 American Physical Society.We report on the physical properties of the intermetallic series RNiSi3(R=Y, Gd-Tm, Lu). High quality single crystals with platelike morphology were grown using the Sn flux method. X-ray ... -
Separation technology meets green chemistry: Development of magnetically recoverable catalyst supports containing silica, ceria, and titania
(2018)© 2018 IUPAC & De Gruyter.Magnetic separation can be considered a green technology because it is fast, efficient, consumes low energy, and minimizes the use of solvents and the generation of waste. It has been successfully ...