Raman spectra of the superionic conductors Ag7TaS6, Ag7NbS6 and Ag7TaSe6, which crystallize in the argyrodite structures, have been studied in the temperature range from 300 to 80K for the first time. In these compounds, there exist the nearly isolated tetrahedral MX4 (M=Ta, Nb; X=S, Se) units, ...

Crystalline thin films of BiTeSe were deposited onto well cleaned glass substrates (BK7 type) by the vacuum thermal evaporation technique at a pressure of 10−3 Pa. Bulk samples were used as targets to evaporate the corresponding films. The internal microstructure of bulk samples and films were c...

The electrocatalysis of nanoscale group V metal carbides (e.g. TaC) has almost received far less attentions owing to lack of active sites. Our theoretical calculations show that high-index (222) facets of TaC are dramatically more active than its other facets towards hydrogen evolution reaction ...

Magnesium reduction of MCl5 (M = Nb or Ta) in the presence of R2S (R = Me or nBu) affords the complexes [M2Cl4(R2S)2(μ-Cl)2(μ-R2S)]. The X-ray structures of those complexes where M = Nb or Ta, R = nBu2S, and of a new polymorph of [Ta2Cl4(Me2S)2(μ-Cl)2(μ-Me2S)], show that they have confacial ...

Two-layered tantalum chalcogenides are evaluated as alkali metal intercalation hosts in lithium and sodium electrochemical cells. The metal-rich pseudo-two-dimensional solid Ta2Se shows a poor intercalation behaviour. Lithium reacts with the selenide by deintercalating selenium from the blocks o...

Cadmium selenide is a direct band gap material which finds applications in optoelectronic devices. Preparation of the compound semiconductor in thin film form with stable electrical characterization has been investigated in the present study. As deposited films at room temperature (25°C) are no...

Zinc Selenide optical substrates have high transparency within the 0.5 to 14.0 μm wavelength range. This makes them an attractive candidate for multi band imaging applications in the optical components. In order to minimize reflection losses for visible, near-infrared and mid-infrared applicati...

The selenide systems of niobium and tantalum were investigated under high pressures in the composition limits of MX2 to MX3. Two distinct phases, NbSe2 and NbSe3, were obtained in the niobium system. In the tantalum system, there were three phases, TaSe2, “TaSe3,” which has been thought of as ...

Amorphous molybdenum selenide nanoparticles were synthesized by the solvothermal treatment of Mo(CO)6 and Se in dimethylformamide. By varying the Mo(CO)6 over Se molar ratio, we obtained a family of MoSe nanoparticles having comparable morphology but different chemical composition. Using a combi...

The complexes [TaSCl3(L-L)] (L-L = MeSCH2CH2SMe, iPrSCH2CH2SiPr, PhSCH2CH2SPh, nBuSCH2CH2CH2SnBu, MeSCH2CH2CH2SMe, MeSeCH2CH2SeMe, nBuSeCH2CH2CH2SenBu) have been synthesised and isolated in good yield as powdered solids by the reaction of TaCl5 with the appropriate chalcogenoether in a 1:1 molar...

The thermal decomposition of (YbO)2Se(s) was studied over the temperature range 1753–1997 K by the Knudsen effusion weight loss technique. The decomposition leads to a gas phase containing ytterbium and selenium with a molar ratio of 2:3 and to a residue of Yb2O3(s). Using literature and estima...

Synthesis and high temperature transport properties of NaCu1+xMn1−xSe2, (x=0−0.75) a new quaternary layered selenide, are reported. NaCuMnSe2 crystallizes in a trigonal unit cell with space group of P-3m1 (a=4.1276 Å, c=7.1253 Å). The isovalent substitution of Mn2+ by Cu2+ is carried out. All th...

Metal chalcogenides with large active sites have been received great attention as an excellent catalyst due to their hierarchical structural properties. Here, we have demonstrated the synthesis of ytterbium-doped molybdenum selenide (YbMoSe2) in the form of two-dimensional nanosheets by using a ...

The congruent vapourization of solid ytterbium (II) selenide of practically stoichiometric composition was studied over the temperature range 1744–2040 K by the Knudsen effusion weight loss technique. Using enthalpy and entropy data for the gaseous species YbSe, Yb, Se and Se2 as well as estima...

Luminescent properties of the ytterbium doped zinc selenide crystals with 0.00–8.00 at % concentrations of the Yb impurity within the temperature interval from 6 K to 300 K were studied. Ytterbium doping was performed within three technological processes: during the growth by chemical vapor tra...

This paper demonstrates the integration of quantum dot (QD) cadmium selenide (CdSe) nanoparticles, which is embedded into polymethyl methacrylate (PMMA) film into an ytterbium-doped fiber laser (YDFL) cavity to produce Q-switched and mode-locked fiber lasers. The QD CdSe based film functions as ...

This paper portrays a simple Q-switched Erbium-doped fibre (EDF) and Ytterbium doped fibre (YDF) lasers by using topological insulator (TI) Bismuth Selenide (Bi2Se3) as saturable absorber. The modulation depth of the fabricated Bi2Se3 is about 39.8% while its saturating intensity is about 90.2 M...

The interaction of trivalent europium and terbium ions with arachidic acid monolayers is reported. The ions are incorporated into the monolayer from the subphase solution, increasing the minimum area per molecule and modifying the pressure–area isotherms. Europium and terbium arachidate bonding...

A new type of terbium diselenide (Tb2Se2) was prepared in the structure of nano octagon and integrated with oxidized carbon nanofiber (f-CNF) by using a simple hydrothermal technique. The oxidation of CNF and the formation of f-CNF/Tb2Se2 nanocomposite were studied by using various analytical te...

In this contribution we use a numerical model to study the photoluminescence emitted by Tb3+ doped chalcogenide-selenide glass fibers pumped by laser light at approximately 3 µm. The model consists of the set of ordinary differential equations (ODEs), which describe the spatial evolution of the...