Complexation of trivalent lanthanoid ions with 4-benzoyl-3-phenyl-5-isoxazolone and p-tert-butylcalix[4]arene fitted with phosphinoyl pendant arms in solution during synergistic solvent extraction and structural study of solid complexes by IR and NMR

The liquid extraction of 14 lanthanoids with a 4-benzoyl-3-phenyl-5-isoxazolone (HPBI) alone in CHCl₃ as a diluent from perchlorate medium at constant ionic strength μ = 0.1 is investigated. The synergistic solvent extraction of five selected lanthanoid ions (La³⁺, Nd³⁺, Eu³⁺, Ho³⁺ and Lu³⁺) with 4-benzoyl-3-phenyl-5-isoxazolone (HPBI) and 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis-(dimethylphosphinoylmethoxy)calix[4]arene, (S) in CHCl₃ has been studied too. The stoichiometry of the extracted species was characterised by a classical log–log plot analysis. It was found that the composition of the extracted species with HPBI are Ln(PBI)₃ and in the presence of the phosphorus-containing calix[4]arene the lanthanoid ions have been extracted as [Ln(PBI)₃S₂]. The values of the equilibrium constants and the separation factors have been calculated. The influence of the synergistic agent on the extraction process has been discussed.     

Preparation,Morphology and Structure of Cadmium Telluride Epitaxial Layers on Germanium Substrates

Growth conditions of cadmium telluride single crystal layers on germanium (111), (110), (100), (112) substrates in quasi-closed “sandwich” system in a hydrogen atmosphere, were investigated in this paper. The peculiarities of layer morphology for the different orientations are presented.     

X-ray double crystal topographic measurements of distorted crystals

A procedure to measure local variations in lattice distortions based on the shrink and enlarge effect of contours, observed on topographs taken by X-ray double crystal reflection technique has been proposed and applied in the study of CdTe crystals. A domination of the orientational component of distortions has been established, reaching to hundreds of arcsec for points at a distance of 1 cm. The variation in spacings Δd/d does not exceed hundredths of a per cent.     

Thermodynamic Evaluation of the Nickel-rich Part of the Ni?Zn-System

Optimization of thermodynamic and phase diagram data about the solid and liquid Ni Zn solutions is performed. The temperature and concentration dependence of the Gibbs free excess energy is described by means of second degree polynomials. The calculated liquidus and solidus curves have been compared to the experimental ones.