[en] A variety of dendritic forms of borax grown from solutions by the film formation method is given. The changing growth morphology is followed as a function of concentration and temperature. The initial, intermediate and final growth morphologies are described and discussed. Influence of evaporation rate and supersaturation on the mechanism of growth is assessed. It is suggested that under all crystallization conditions, borax crystals have dendritic form in the initial stages of growth. (author)

[en] A technique is proposed based upon angular scanning of a bent crystal shifted from the rotation axis. The axis-to-crystal distance providing the maximum reflecting efficiency is used to determine the bending radius of reflecting planes, and the diffraction profile can be obtained using an efficiency variation with a crystal shift tangential to Rowland circle at front focus. A rocking curve plotted - a 'topogram' of the crystal surface is used to measure its reflecting area and a regularity of bending. The technique is suitable for various types of analyzers in both the reflecting and transmitting arrangements. Instrumental conditions are defined and some experimental examples are given. (author)

[en] Thermoluminescence (TL) and optical absorption measurements have been carried in γ-irradiated KCl, KBr and various compositions of KCl/sub x/Br/sub 1-x/ mixed crystals as a function of irradiation time and composition. The position of the main glow peak (high temperature peak) and F-band position are found to vary non-linearly with composition, showing a correlation between colour centers and TL. The TL peaks have been analysed by numerical fitting and the trap depths and frequency factors have been calculated for different compositions of the mixed crystals. The thermal ionisation energy of F-centers has been calculated for the mixed crystals and it is found to vary non-linearly with composition. The results obtained in mixed crystals have been discussed in terms of high disorder present in them. (author)

[en] The chalcopyrite-type compounds AgGaS₂ and CdGeAs₂ are investigated by means of thermal expansion data in order to get information about the anisotropy of the Grueneisen parameters

[en] The temperature dependence of the thermoelectric power theta of unquenched and quenched polycrystalline NaYF₄ samples is investigated in order to understand the transport properties clearly. After increasing of theta with temperature up to 365 K the curve saturates

[en] The exchange of Zn²⁺, Cd²⁺ and Hg²⁺ with zeolite NaX has been studied. The influence of the above cations on crystalline structure of zeolite X and its thermal stability has been shown on the grounds of X-ray diffraction, differential thermal analysis and infrared spectroscopic measurements. (author)

[en] It has been carried out the investigation of the mosaic structure of ZnO crystals by two methods providing the information on mosaic structure and inner stresses (γ-ray diffraction and conoscopic method). It has been observed a certain correlation between the results obtained by the two methods. (author)

No abstract available

[en] The spectroscopic model for the heat of formation of tetrahedrally coordinated binary compounds is extended to the ternary chalcopyrite semiconductors. The heats of formation of all A/sup I/B/sup III/C₂/sup VI/ compounds are evaluated and compared with experimental data. Possible reasons for existing discrepancies between theory and experiment are discussed. (author)

[en] Two methods are described and compared to determine the crystallographic polarity of (111)-oriented InP crystals. The results obtained by means of the Kossel method are in good agreement with the results of chemical etching using 1% bromine/methanol