Ozone gas sensor based on nanocrystalline SrTi1-xFexO3 thin films Abstract: We report on the use of nanocrystalline SrTi1−xFexO3 (STF) for sensing ozone gas. Amorphous thin films were evaporated by the electron-beam physical vapor deposition technique and then converted to a polycrystalline form, as […]
Intrinsic magnetic properties of BixCo2−xMnO4 spinels obtained by short-time etching Abstract: We report the structural and magnetic properties of Co2MnO4, partially substituted by Bi at the octahedral site. Bismuth enhances ferromagnetism due to a decrease of the […]
Implementation of convective heating in Companhia Siderúrgica Nacional Blast Furnace runners Abstract: This paper describes the main characteristics and advantages of convective heating system for refractory lining, compared with conventional heating systems. In addition the main […]
Decay of photo-induced conductivity in Sb-doped SnO2 thin films, using monochromatic light of about bandgap energy Abstract: Doping tin dioxide (SnO2) with pentavalent Sb5+ ions leads to an enhancement in the electrical conductivity of this material, […]
Far-infrared spectroscopic study of CeO2 nanocrystals Abstract: We present the far-infrared reflectivity spectra of 5 nm-sized pure and copper-doped Ce1−x Cu xO2−y (x = 0; 0.01 and 0.10) nanocrystals measured at room temperature in the 50–650 cm−1spectral range. Reflectivity spectra were analyzed using […]
Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence Abstract: Silver molybdate (Ag2MoO4) and silver tungstate (Ag2WO4) nanomaterials were prepared using two complementary methods, microwave assisted hydrothermal synthesis (MAH) (pH 7, 140 °C) and co-precipitation (pH […]
Rietveld refinement and optical properties of SrWO4:Eu3+ powders prepared by the non-hydrolytic sol-gel method Abstract: We investigated the effect of annealing time on the structure and optical properties of SrWO4:Eu3+ powders prepared by the non-hydrolytic sol-gel method […]
Rapid hydrothermal synthesis and pH-dependent photocatalysis of strontium titanate microspheres Abstract: This manuscript describes a methodology for a rapid hydrothermal conventional synthesis of SrTiO3. The time of synthesis and use of mechanical stirring are related to […]
Light emission during electric field-assisted sintering of electroceramics Abstract: Electric field-assisted sintering has been shown to occur in ion, electron conducting as well as in insulating polycrystalline ceramics. Considerable linear shrinkage with microstructure control at temperatures lower than […]
Anomalous remnant magnetization in dilute antiferromagnetic Gd1−xYxB4 Abstract: Magnetic properties of dilute single crystals of Gd1−xYxB4 (x=0, 0.2, and 0.4) were systematically studied. These antiferromagnetic Shastry-Sutherland compounds display a remnant magnetization MRwhen field cooled below the Néel temperature TN. The […]
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