BaSnO3 has attracted attention as a transparent conducting oxide with high room temperature carrier mobility. We report a series of measurements that were carried out to assess the structure of BaSnO3 over a variety of length scales. Measurements included single crystal neutron and x-ray diffrac...

Adsorption of NO from a gas stream containing oxygen and water and desorption and reduction using a rich gas mixture were investigated in the temperature range 230–315 °C on Na–Y zeolite loaded with 3 wt.% ruthenium. The NOx storage capacity was found little dependent on temperature and water...

Ruthenium species, volatilized from damaged fuel during a severe accident in a nuclear power plant, are radiotoxic and can be transported to the containment atmosphere in gaseous form. To limit the possible source term to the environment, it is of interest to understand the behaviour of Ru after...

Phosphate glasses of the ternary system BaO-Nb2O5-P2O5 were studied in two compositional series, namely 40BaO-xNb2O5-(60-x)P2O5 (series A), with x = 0–40 mol% Nb2O5, and yBaO-20Nb2O5-(80-y)P2O5 (series B), with y = 20–60 mol% BaO. Nine homogeneous glassy samples were prepared altogether in bot...

The Chuktukon niobium-rare earth elements ore deposit is located in Siberia (Russia). Weathered carbonatite crusts are the basis of the ore deposit. The deposit itself is 3.5 km in length, about 800 to 1400 m in width and up to 200–300 m in thickness. The ores are composed of iron-manganese oxi...

BaBi4Ti4–5/4xNbxO15 (BBNTx, x = 0, 0.05, 0.15, 0.30) ceramics have been prepared by solid state method. XRD data indicate the formation of single-phase-layered perovskites for all compositions. SEM micrographs suggest that the grain size decreases with Nb doping. The effect of niobium doping on...

Photooxidation of alcohols without solvents in the presence of O2 takes place at the atmospheric pressure and room temperature over niobium oxide. From the results of photooxidation of 1-pentanol over niobium oxides calcined at various temperatures, we judged that niobium oxide calcined at 773 K...

Magnetic dilution and NEXAFS spectroscopy were used in the study of iron-containing solid solutions Bi2MNb2O9 (M – Ba, Sr) with layered perovskite-like structure. The analysis of the NEXAFS Fe2p-spectra of iron-containing solid solutions and iron oxides revealed that the studied Fe atoms were m...

In the system Ba–Nb–O–N a superconducting ceramic material with Tc=22 K was synthesized. The temperature dependencies of magnetic susceptibility and resistivity of these ceramics with different oxygen concentrations was studied. A large increase of Tc was observed, from 12 K for samples prepa...

This study describes the application of TiO2 in different forms (anatase, P25, TiO2 commercial), ZnO and Nb2O5 for barium ions (Ba(II)) reduction by photocatalysis process. Specific surface area (B.E.T method), X-ray diffraction and photo-acoustic spectroscopy techniques were applied for the cat...

The catalytic activity of niobium oxide-based materials, containing the same amount of Nb2O5 (∼15 wt%) and prepared by different methods, with that of pure Nb2O5 in the epoxidation of methyl oleate with hydrogen peroxide was compared.The catalytic performances of the catalyst prepared by impreg...

In recent decades, environmental issues and the emphasis on sustainable development has resulted in increasing pressure to use natural resources more efficiently and reduce the generation and emission of industrial waste. Therefore, the metallurgical industry has focused on the exploration and p...

Phosphate glasses containing a high amount of niobium oxide exhibit non-linear optical properties which make them attractive for various optical devices. This contribution is devoted to the investigation of glasses of the series (100 − x)[0.5BaO–0.1B2O3–0.4P2O5]–xNb2O5 with x = 0–45 and 80[0...

A density functional mPW1PW91 study of the most stable conformers of MOH(H2O)0–3 clusters (M = alkali or alkaline-earth atom) was performed, along with quantum chemistry CCSD(T,Full) calculations for M = Li and Be. The resulting binding energies for hydration, atom-charge and valence-electron d...

Thin films of YbB4 and YbB6 have been deposited on sapphire substrates via hybrid physical chemical vapor deposition (HPCVD) using elemental ytterbium and decaborane, B10H14, as sources. The deposition condition dependence of the composition, purity, crystallinity and electrical properties has b...

A holmium boride HoB50 polycrystalline sample was synthesised by boron-thermal reduction from the elements at high temperature. The temperature dependencies of the heat capacity Ср(Т) and the unit cell parameters a(T), b(T), c(T) of holmium boride were determined experimentally in the tempera...

The neptunium and americium boride systems have been examined by X-ray powder diffraction techniques. In the neptunium-boron system, four phases, NpB2, NpB4, NpB6, and NpB12, were observed, while in the americium-boron system, only two phases, AmB4 and AmB6, were found. Lattice parameters and th...

From analysing the electronic paramagnetic resonance (EPR) spectra and from the heat capacity at low temperatures it was concluded that the. transition from metal to semiconductor behaviour in some compounds is connected with the formation of s states. The EPR spectrum in SmB6 can be due either ...

Using as initial data the most reliable values of standard entropy for 10 compounds, the entropies for 40 compounds of non-transition metals, rare-earth metals and actinides have been evaluated by the method of comparative calculation. Taking into account the features of boride structures, two m...

Ternary iron-praseodymium-boron alloys with 12 at.% Pr and 4 at.% B are potential high-performance permanent magnets in the bulk and respond to conventional processing methods. The magnetic phase is Fe21Pr3B with a primitive tetragonal lattice (a = 0.886, c = 1.224 nm). It exhibits high magnetoc...