A fine and platelet tungsten carbide patterned structure with fine yttrium containing dispersed phase was observed in liquid phase sintered WC-20%Co-1%Y2O3 cemented carbide with ultrafine tungsten carbide and nano yttrium oxide as starting materials. By comparing the microstructures of the alloy...

Effects of yttrium on the calcination of ammonium paratungstate (APT), reduction of tungsten oxide, carbonization of tungsten and sintering of cemented carbides were studied during the preparation of yttrium-doped cemented tungsten carbide. The phase compositions, particle sizes and morphologies...

During the production of uranium oxide microspheres with carbon using internal gelation, a small fraction of microspheres will not meet the required size or sphericity specification. The uranium microspheres with carbon can be rejected after they have been air-dried or converted into uranium car...

The oxidation of a mixed uranium dicarbide and graphite powder has been investigated by simultaneous thermal gravimetric (TGA) and differential thermal (DTA) analyses coupled with gas phase chromatography. For isothermal oxidation conditions with temperatures below 330 °C, only the UC2 chemical...

The transport behaviour of strontium and iodine through single and polycrystalline SiC wafers was investigated using ion beam analysis and electron microscopy. Fluences of 2 × 1016 Sr+ cm−2 and 1 × 1016 I+ cm−2 were implanted at temperatures between 23 °C and 600 °C with an energy of 360 keV...

The influence of swift heavy ions (SHIs) irradiation on the microstructure and the migration behavior of strontium (Sr) implanted into polycrystalline SiC were investigated using Rutherford backscattering spectrometry (RBS), Raman spectroscopy and scanning electron microscopy (SEM). The as-impla...

A series of Fe/SiO2 catalysts with different strontium/iron molar ratios were used to investigate the chemical and structural effects of strontium on the iron-based Fischer-Tropsch synthesis (FTS) catalysts. It was found that the chemical effect of strontium strengthened FeO bonds of Fe2O3 and h...

The radiation enhanced diffusion (RED) of three key fission products in SiC: cesium, europium, and strontium was investigated following ion irradiation at a damage rate of 4.6 × 10−4 dpa s−1 at temperatures between 900° C and 1100° C. The radiation enhancement of diffusion was as large as 107...

A novel multi-layer diffusion couple was used to isolate the diffusion of strontium, europium and cesium in SiC without introducing radiation damage to SiC and at concentrations below the solubility limit for the fission products in SiC. Diffusion occurred by both bulk and grain boundary pathway...

The 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim]BF4, is an ionic liquid when pure. The acid base properties of aqueous solutions of [bmim]BF4 were examined by potentiometric titration. Then, protonation constants of glycine in binary mixtures of water and [bmim]BF4 were determined, from...

The autoprotolysis constants (Ks) of water – 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF4) mixtures were determined at 298 K over the composition range of 0 to 77.43 vol.% bmimBF4 using potentiometric method with a glass electrode. A slight increase in the autoprotolysis constant was ...

The effect of water and methanol on the self-assembled structures formed by the polyethylene oxide–polypropylene oxide–polyethylene oxide block copolymer Pluronic P123 in ethylammonium nitrate was investigated by small angle X-ray scattering (SAXS). Two ternary phase diagrams were established....

The increasing number of publications reflects the still growing interest in nonaqueous microemulsions containing room-temperature ionic liquids. Recently, we characterized microemulsions composed of the room-temperature ionic liquid ethylammonium nitrate (EAN) as polar phase, dodecane as contin...

Values of partial molar volumes at infinite dilution of 9 inorganic and 4 organic 1:1 electrolytes have been determined in (water + ethylammonium nitrate) (EAN) binary at 298.15 K throughout the composition scale. Our theoretical analysis shows that the values of partial molar volumes at infinit...

Electrochemical impedance spectroscopy was used to evaluate protic ionic liquid (pIL)-water mixtures in the temperature range of −35–25 °C. The pIL used in this study was ethylammonium nitrate (EAN). At room temperature, the resonant mode of conductivity was observed in the high frequency regi...

The aggregation behavior of long-chain pyrrolidinium ionic liquids, N-alkyl-N-methylpyrrolidinium bromide (CnMPB, n = 12, 14, and 16) was investigated by surface tension measurements in a protic room temperature ionic liquid, ethylammonium nitrate (EAN), at various temperatures. A series of para...

Densities and viscosities of binary mixtures containing 1-butyl-3-methylimidazolium tetrafluoroborate with water over the salt-rich region concentrations are reported for a temperature range of (283.15 to 373.15) K and compared with literature. The temperature dependence of the mixture densities...

In pure ethylammonium nitrate (EAN), which is a protic ionic liquid (pIL), multiple crystallization pathways are extracted by simultaneous X-ray diffraction and differential scanning calorimetry measurements. Multiple pathways for crystallization are selected by minimum temperatures in a pure EA...

This study concerns volumetric behaviour of mixtures between water and three ionic liquids: 1-butyl-3-methylimidazolium tetrafluoroborate (bmimBF4), 1-butyl-2,3-dimethylimidazolium tetrafluoroborate (bdmimBF4), and ethylammonium nitrate (EAN). We report that the pseudo-lattice theory proposed by...

Crystal structure of NaCl-type transition metal monocarbides MC (M = V, Ti, Nb, Ta, Hf and Zr) has been investigated by Rietveld analysis of neutron powder diffraction data measured at 23 °C. The unit-cell parameter a of MC compounds increased with increasing of ionic radius of the metal specie...