Ternary rare-earth manganese arsenides RE4Mn2As5 (RE = La–Pr) have been synthesized by direct reactions of the elements in the presence of Ga flux. They are the first examples of RE–Mn–As phases containing trivalent RE metals. Powder and single-crystal X-ray diffraction analysis revealed that...

“1 1 1”-type iron arsenide compounds AFeAs (A = Li, Na) were synthesized. These compounds crystallize into Cu2Sb type tetragonal layered structure with space group P4/nmm and show superconductivity with the transition temperature ∼18 K for LiFeAs and ∼23 K for NaFeAs. The effect of pressure ...

We investigated the in-plane anisotropy of the thermopower and electrical resistivity on detwinned single crystals of BaFe2As2. The in-plane anisotropy of the resistivity was clearly observed far above the magnetostructural transition temperature TAFO. While, the thermopower showed the in-plane ...

Using a local real-space microscopy probe, we discover evidence of nanoscale interlayer defects along the c-crystallographic direction in BaFe2As2 (‘122’) based iron-arsenide superconductors. We find ordered 122 atomic arrangements within the ab-plane, and within regions of ∼10 to 20 nm size ...

The effects of adding sodium (Na) ion into lithium (Li) ion containing organic electrolyte on the cycle behaviors of Li deposition–stripping on Li22Sn5 substrate are investigated. The functions and mechanism of Na+ addition to the electrolyte are evaluated through scanning electron microscopy, ...

The reactivity of (heptafluoro-1,4-cyclohexadien-1-yl)xenon(ii) hexafluoroarsenate 1 towards a fluoride donor and acceptor has been investigated; the interaction of 1 with NaF led to perfluoro-3-methylenecyclopentene and xenon. No dication [C6F6Xe]2+ was detected by 19F NMR spectroscopy when [1-...

A spectrophotometric method for the hexafluoroarsenate anion is described. The determination involves selective extraction of the tris(1,10-phenanthroline)iron(II) salt of the anion into n-butyronitrile, followed by measurement of the absorbance of the organic layer. The extracts give good Beer&...

The arsenic species hexafluoroarsenate has been described as a contaminant of surface waters of anthropogenic origin. Here, we undertake to identify the most sensitive biological receptor among several sentinel aquatic species used in eco-toxicological assessment and to understand toxicity in te...

Arsenic predominantly occurs in natural ground and surface waters as arsenate and arsenite. Other arsenic species can also be present in anthropogenically influenced waters. By means of a newly-developed speciation technique an arsenic compound was identified as hexafluoroarsenate at high concen...

The rate of hydrolysis of the AsF6− was examined over a wide range of both acidic and basic conditions in aqueous solutions. No hydrolysis was detected in basic solutions, but it was possible to follow the rate of decomposition in concentrated sulfuric acid. The rate equation found was that for ...

A first-stage graphite intercalation compound of a strong fluoroacid. graphite hexafluoroarsenate (C10AsF6) reacts with fluorobases such as potassium fluoride in anhydrous hydrogen fluoride (AHF) to give a second-stage compound. X-ray diffraction and XPS analyses revealed that the compound is co...

Dysprosium and ytterbium monophosphides have been prepared by the solid state reaction. The optical and electrical properties have been studied. Evidence that DyP and YbP are semiconductors has been obtained from the study of the absorption spectrum, the negative temperature coefficient of resis...

The data in the literature relevant to the rare earth antimonide phase diagrams and the crystallochemical and thermodynamic properties of the rare earth antimonides are summarized. The data obtained in an investigation of Dy-Sb compounds are reported. This investigation was performed using X-ray...

The thermal expansion behaviour of rare earth antimonides of the Ln5Sb3 type (Ln ≡ Nd, Sm, Gd, Tb, Dy or Ho) was studied in the temperature range 300–1100 K.The thermal expansion coefficients and the characteristic Debye temperatures were determined. It was shown by differential thermal analys...

New ternary antimonide Dy3Cu20+xSb11−x (x≈2) was synthesized and its crystal structure was determined by direct methods from X-ray powder diffraction data (diffractometer DRON-3M, CuKα-radiation, RI=6.99%,Rp=12.27%,Rwp=11.55%). The compound crystallizes with the own cubic structure type: space...

Equilibrium and non-equilibrium molecular dynamics (EMD and NEMD) simulations were performed to investigate the thermal conductivities of americium dioxide and sesquioxide up to 2000 K using the Born–Mayer–Huggins interatomic potential with the partially ionic model. The potential parameters w...

The vaporisation behaviour of americium dioxide in vacuum at high temperatures up to 2400 K has been studied. A Knudsen cell coupled with a mass spectrometer was used to perform vapour pressure measurements. The ionisation efficiency curves of Am+, AmO+ and AmO2+ were simultaneously recorded. Ap...

(Uranium + americium) mixed oxides are considered as potential targets for americium transmutation in fast neutron reactors. Their thermophysical properties and notably their melting behaviour have not been assessed properly although required in order to evaluate the safety of these compounds un...

The paper analyzes four new borate-free aluminum alloys cleaners, designed for the removal of grease, ink or solid soils contaminating the surface of aluminum components before anodizing or painting stages. Different borate-free formulations (2 proposed by Italtecno MG19 NB2, MG19 NB3 and two av...

In this work, several nanostructured borates such as magnesium, zinc, aluminum and titanium borates were synthesized. These borates were added to drilling muds and their ability to improve tribological properties of water-based drilling fluids, was investigated. The tribological properties of th...