By an experiment designed as a crucial test for the tunnel theory of charge density waves on one side and the overdamped oscillator model on the other side, it is shown that only the former theory is applicable to niobium triselenide below and above threshold. Calculations of the dielectric func...

A novel borane-capped niobium phosphide anion ([B(C6F5)3-1]) has been prepared in 87% yield by reaction of [PNb(N[Np]Ar)3]− (1, Ar = 3,5-C6H3Me2 and Np = neopentyl) with the Lewis acidic borane B(C6F5)3. Room-temperature reaction of this adduct with carbon dioxide readily yields the OCP− ion 3, ...

Sol-gel processed niobium oxide (Nb2O5) thin-film was synthesized for a scaffold layer (SL) of methylammonium lead iodide-based perovskite film. Complementary characterizations, including scanning electron microscopy, X-ray diffraction, optical absorption spectroscopy have revealed that the Nb2O...

In this work, very high acidity niobium oxide was obtained by surface modification with sulfate groups. This modification increased the Brønsted acidity of niobium oxide and the functionalized material showed noticeable activity in the biodiesel production using the esterification of oleic acid ...

Niobium oxide layers with a thickness in the range of 1.0–1.4 μm were deposited on silicon single crystal wafers by magnetron sputtering using substoichiometric niobium oxide target materials. After the deposition process, the layer material was completely amorphous. The primary crystallizatio...

Niobium is a very important element in catalysis, active component of many catalytic systems. But it is not only a major component in many catalytic systems; in addition, it is usually used as a key promoter, because it has a rich complex chemistry and is able to react with many elements forming...

Oxidation behaviors of halide activated pack cementation (HAPC) silicide coatings on niobium alloy were elaborately studied by experimental and theoretical analysis. The HAPC process was performed with a commonly applied powder pack of Si, NH4F, and Al2O3 filler. Adsorptive Al2O3 particles from ...

Two types of anodic niobium-oxide nanofilms were synthesized via anodization of an Al/Nb bilayer sputter-deposited onto a SiO2-coated Si wafer. Type I nanofilm was composed of a 200 nm thick NbO2 layer holding the upright-standing 650 nm long, 50 nm wide, and 70 nm spaced Nb2O5 nanorods, of 7·1...

The extraction of tin through smelting of cassiterite (SnO2) has generated considerable amounts of slag in the main production areas of South-East Asia, Africa, and South America. Tantalum and niobium naturally occur in cassiterite deposits and are concentrated in the slag during the smelting pr...

Activating a self-healing process is a viable approach for preventing the failure of ceramics experiencing mechanically-induced crack propagation. Previously, it was demonstrated that niobium oxide (Nb2O5) exhibits self-healing properties activated by the formation of Nb-Ag-O ternary oxide when ...

Reliable and effective water disinfectants are of paramount importance to address mounting health concerns in drinking water. Herein, Vanadium Tetrasulfide (VS4) nanocomposites supported by different carbon materials, including VS4/CP (carbon powder), VS4/rGO (reduced graphene oxides), VS4/CF (c...

To date, cyanide-assisted gold leaching has been considered to be the predominant method for gold extraction owing to its simple process and low cost. Increasing concerns on the toxicity of cyanide have triggered the efforts to find the non-cyanide methods to extract the gold from gold ores for ...

A silica-based mesoporous adsorbent, SBA-15-S4 was synthesized through the surfactant method and modified by bis(3-triethoxysilylpropyl) tetrasulfide. The obtained sorbent was characterized by FT-IR, BET, TGA, XRD, SEM, TEM, SAXS and EDX. Further studies revealed that the new synthesis sorbent h...

To avoid agglomeration and sedimentation of grains, ceramic slurries should be modified by stabilizers in order to increase the electrostatic interactions between the dispersed particles. In this study we present the spectral analysis of aqueous sodium silicates obtained by different synthesis m...

A simple ultrasonic dip-coating process was utilized to fabricate sodium silicate thin films on aluminum alloy substrates, and their chemical and corrosion properties were investigated as a function of their concentration in the solution. The attenuated total reflectance Fourier transmission inf...

Combined optical and FTIR spectral analysis were used to investigate prepared invert two alkali silicate glasses (Na2O·SiO2K2O·SiO2) containing high titanium oxide content. Glass ceramic derivatives were prepared through thermal two step regime of the parent glasses and they were characterized...

Surface magnetization provides a possible approach for recovering weak or non-magnetic minerals via magnetic separation. In the present study, magnetite selective coating was used to enlarge the magnetic difference between ilmenite and titanaugite and further separate them. During this process, ...

Depressant effects of carboxymethyl cellulose (CMC) and sodium silicate on flotation of ilmenite and forsterite using sodium oleate (NaOL) as a collector were investigated by single mineral flotation, zeta-potential, Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS), and...

In this work, an extremely high activity for visible light driven photocatalytic degradation of organic dyes was achieved on a restacked titanate nanosheets (rs-TNSs) material with the assistance of hydrogen peroxide (H2O2). The photocatalyst was obtained via exfoliating layered titanate precurs...

In the present study, titanate nanotubes (denoted as TNTs) synthesized through a simple hydrothermal approach was applied for the decontamination of Zn(II) from aqueous solution. Batch experimental results showed that the removal kinetics process was fast and reached equilibrium after 60 min. Th...