The kinetics of formation of crystal boron was studied by X-ray structure and differential-thermal analyses. The enthalpy of transition of amorphous boron to crystal boron with formation of an intermediate non-equilibrium phase was determined by the calorimetric method. Studies were carried out by using the differential scanning calorimeter SETARAM. Amorphous boron received by diboron cracking was used as the starting material. The test sample is characterized by stability even at a high temperature. When heated, amorphous boron first transforms to crystal boron of α-modification, and during a further heating, there occur several phase transitions, which means the transition of α-rhombohedric crystal boron to the βʹ and βʺ metastable states. Studies of various modifications were carried out by radiographic and electro-optic methods. The high sensitiveness of the calorimeter made it possible to control temperature in the oven, make records and detect even the smallest thermal effects.

Abstract. Based on arsenic compounds obtained by transformation of arsenic industrial waste and natural resources (arsenic (III) oxide, arsenic (III) chlorides, alkoxides, stibium (III) oxide), we obtained and studied new coordination compounds, "white arsenic", hyperpure metallic arsenic and various materials with specific properties.By using obtained non-volatile inorganic-organic complexes we created and tested new cheap anti-microbe substances and fungicides for protection of archaelogical items and museum exhibits and biological stuff. Based on the organic hetero-chain polymers modified by carbofunctional siliconorganic oligomers we created anti-biocorrosive covers for woodwork, goods from plastics and leather. We discussed the possibility of obtaining siloxane-arsenic oligomeric additions for under-water hydrophobic bioactive dye composites. We have shown the real perspective to manufacture madications, anti-helmintes, semi-conductors, optical glass-fibers and bio-medical nano composites based on Georgian region arsenic industrial waste and natural resources.

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