Mohammad Arif

Mass spectrometry of carbon nitride C3N4

Carbon nitride has been synthesized in macroscopic amounts by means of the original method based on an ecologically safe technology using inorganic initial compounds. The product has been characterized by mass spectrometry (MS), X-ray diffraction, and quantitative chemical analysis. The MS and thermochemical data show that stoichiometry of the samples of carbon nitride obtained using the proposed method corresponds to the empirical formula C3N4.

Structure and magnetic properties of iron based nanoparticles with oxide shells

Oxide-coated iron nanoparticles with average dimensions from 6 to 75 nm have been synthesized by chemical vapor condensation. The structure of particles and their size distribution have been determined. These data are used to interpret the results of measurements of the magnetic hysteresis characteristics.

Preparation and properties of copper indium diselenide CuInSe2

Polycrystalline alloys in the Cu-In-Se ternary system of specified compositions are synthesized using an original silica apparatus designed by the authors and the temperature-time conditions also specially chosen for this synthesis. The region of existence of CuInSe2-based solid solutions in the Cu-In-Se system, the temperature of the polymorphic transformation of the CuInSe2 compound from the chalcopyrite modification into the sphalerite modification, and the melting temperature of the sphalerite modification are determined experimentally.

Investigation of Concretions from the Baltic Sea

The composition and specific features of the dissolution of iron manganese concretions from the Baltic Sea are investigated using an echelle spectrometer and atomic absorption spectrometry. The concretion samples used in the analysis are treated in diluted solutions of hydrochloric and nitric acids with additives of hydrogen peroxide. The as-analyzed ratio Mn : Fe in the samples studied is equal to 1.7, which is an important characteristic of the ratio of d elements involved in concretions from the Baltic Sea. The results of the investigations performed can be used to develop more efficient methods for selective extraction of manganese from similar concretions and to determine the isotope content in noble gases of ancient artifact origin that survive in concretions of the World Ocean.