Mössbauer absorption spectra were obtained for the 25.7 keV transitions of 161Dy in dysprosium metal and several compounds at room temperature. Isomer shifts relative to DyF3 are: Dy (metal), 3.05 mm sec−1; DyN, 0.85 mm sec−1; Dy2O3, 0.56 mm sec−1; DyH2.9, 0.55 mm sec−1; DyH2.1, 0.50 mm sec−1; D...

DyH3 has been investigated with the 161Dy Mössbauer resonance. For the first time it is shown that the electric field gradient at the rare earth nucleus in a hexagonal trihydride is non-axial. This verifies that the hydrogen atom contribution lowers the effective symmetry of the local crystal el...

Perturbed angular correlation measurements have been performed on two dysprosium hydrides (DyHx with x ≈ 2 and x ≈ 3) using the 181Ta nucleus as a substitutional probe.When x ≈ 2, the observed electric field gradients result from hydrogen vacancies in a cubic lattice.The contribution of the c...

High-pressure X-ray diffraction studies of gadolinum, holmium and lutetium trihydrides have been carried out in a diamond anvil cell up to 30 GPa at room temperature. A reversible structural phase transformation from the hexagonal to cubic phase has been observed for all the hydrides investigate...

The dysprosium-hydrogen (Dy-H) binary system in the full range of H/Dy = 0 to 3.0 is investigated by accurate pressure composition isotherm (PCI) measurement, including a PCI measurement of the β-DyH2/γ-DyH3 transition for the first time. The Dy/β-DyH2 biphasic region shows well defined plate...

Synchrotron X-ray and Raman scattering investigations have been performed on dysprosium trihydride at high pressure up to 40 GPa. Structural phase transformation from original hexagonal to cubic phase has been observed confirming predictions from other studies and theoretical calculations. Dyspr...

The thermodynamically most stable GeSiH4 isomer – silylgermylene (H3SiGeH(X1A′)) – and its perdeuterated counterpart were detected for the first time via infrared spectroscopy in low temperature silane (SiH4) – germane (GeH4) and D4-silane – D4-germane ices upon irradiation with energetic e...

The adsorption of deuterium and deuterium sulfide was studied on the MoS2(0001) basal surface using temperature programmed desorption (TPD) and four-point surface conductivity measurements. Deuterium did not dissociatively adsorb to the basal MoS2(0001) surface upon exposure, and thus was dissoc...

The absorption spectra of 4f electron transitions of the neodymium and erbium complexes with benzoyl-indan-1,3-dione and cetyltrimethylammonium bromide have been studied by normal and derivative spectrophotometry. The molar absorptivity of 4f electron transitions at the maximum absorption bands ...

Erbium (Er)-doped BiOBr with different Er ions doping concentrations has been synthesized through a solvothermal method in the presence of reactive ionic liquid 1-hexadecyl-3-methylimidazolium bromide ([C16mim]Br). The as-prepared samples were characterized by X-ray diffraction (XRD), X-ray phot...

Spectroscopic properties of optical absorption, luminescence and infrared spectral studies are measured for erbium doped Li2O–BaO–P2O5 glasses. These glasses were prepared by the melt quenching technique in the compositional series containing 0.5, 1.0 and 1.5 mol % of erbium. From the optical ...

A new mixed doped tellurium oxide, TiTe3O8: 2%Er, was synthesized by the conventional solid-state reaction method at a temperature T = 700 °C for 10 h. The structure of the ceramic was investigated using X-ray powder diffraction at room temperature. This compound crystallizes in the Ia3¯ cubic...

The invention, and subsequent development of external cavity quantum cascade lasers (EC-QCLs) has allowed relatively simple access to a wide spectral region for high resolution laser spectroscopy. In this Letter, we demonstrate the application of a broadly tunable 5.3 μm EC-QCL to absorption sp...

The potassium lanthanum ternary halides are appropriate host lattices for various luminescent materials including laser devices. The lanthanum ternary halide lattice, co-doped by different lanthanide ions, can exhibit up-conversion emission in a wide spectral range from blue to red. For this pur...

It is well known that sensing performances depend critically on nature of sensor material, its structure and morphology. Praseodymium oxide nanoparticle has currently been receiving much attention as a new sensor material. Thus, three methods for the preparations of praseodymium oxide nanopartic...

Praseodymium ion selective polyvinyl chloride (PVC) membrane sensors, based on two new Schiff's bases 1,3-diphenylpropane-1,3-diylidenebis(azan-1-ylidene)diphenol (M1) and N,N′-bis(pyridoxylideneiminato) ethylene (M2) have been developed and studied. The sensor having membrane composition ...

The monocrystals of ternary praseodymium bromides were obtained by Bridgman technique. The high resolution absorption emission and emission excitation spectra were studied in the UV, VIS and near-infrared regions at 293, 77 and 4 K. In these spectral regions the 4f–5d and f–f Pr(III) transitio...

The coordination structures formed by calcium complexes with nicotinamide (na), isonicotinamide (ina) and picolinamide (pa) and praseodymium bromide-na are reported. The structures of CaCl2·(C6H6N2O)2·2H2O (Ca-na), CaCl2·(C6H6N2O)2·4H2O (Ca-ina), CaCl2·(C6H6N2O)2·5H2O (Ca-pa) and PrBr3·(C...

l-Kynurenine is a metabolic precursor of kynurenic acid, which is one of the few known endogenous N-methyl-d-aspartate receptor inhibitors. In contrast with kynurenic acid, l-kynurenine is transported across the blood-brain barrier, and it may therefore come into consideration as a therapeutic a...

Excessive stimulation of N-methyl-D-aspartate (NMDA) receptors during ischemia contributes to apoptotic and excitotoxic nerve cell death. Kynurenic acid is a selective antagonist at the glycine co-agonist site of the NMDA receptor complex at low concentration, and it is a broad-spectrum excitato...