[en] The purpose of work is improvement of synthesis process of boron- and aluminium hydrides of rare earth metals of yttrium subgroup by mechanical-chemical method; elaboration of conditions of obtaining their borides; to study physicochemical and thermodynamic properties of some borohydrides of rare earth metals of yttrium subgroup; determination of regularities in modifications of thermodynamic properties of studied compounds. Therefore, the optimal conditions of synthesis of de solvated borohydrides of lanthanoids of yttrium subgroup - Ln(BH₄)₃ (Ln=Gd, Dy, Er, Tm, Yb, Lu) and optimal conditions for some aluminum hydrides of these metals have been defined. The temperature interval and dependencies of thermal stability of borohydrides on nature of lanthanides, chemical scheme, thermodynamic characteristics of the process of thermal decomposition of obtained lanthanoid borohydrides have been determined. The conditions of obtaining of three- and hexaboride of yttrium subgroup at thermal decomposition of borohydrides have been defined. The regularities in modifications of thermodynamic characteristics of borohydrides of rare earth metals of yttrium subgroup depending on nature of lanthanides have been determined.

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[en] Present article is devoted to properties of boron- and aluminium hydrides of rare earth metals. Thus, aluminium hydrides of erbium and gadolinium in the medium of dimethyl alcohol diethyleneglycol have been synthesized. Thermal stability of borohydrides and aluminium hydrides of lanthanides has been determined.

[en] Chemical development of borohydride and aluminium hydride lanthanoids is shown in this article. It is shown, that borohydride lanthanoids are stable chemical modes. (author)

[en] Present article is devoted to kinetics of thermal decomposition of complex aluminium- and binary potassium hydrides. The process of thermal decomposition of tetrahydroaluminate of potassium (KAlH₄) was studied by means of tensimetry method with membrane zero-manometer at equilibrium conditions. It was defined that the process at studied temperature rates 470-770 K compose of three stages.

[en] Present article is devoted to synthesis of borohydrides of rare earth metals by mechanic-chemical methods. The borohydrides of rare earth metals were obtained by means of mechanic-chemical methods. Physicochemical properties of obtained lanthanoid borohydrides were studied by means of X-ray phase analysis.

[en] Present article is devoted to enthalpy assessment of oxides formation of 4 f- and 5 f-elements. The enthalpy evaluation of formation of lanthanoid oxides and complex lanthanoid hydrides as well as actinide oxides was conducted by means of semiempirical method.