a b s t r a c tActivity of uranium was determine d in gallium, indium and gallium-indium eutectic (21.8 wt.% In) based alloys between 573 and 1073 K employing the electromotive force method. In two-phase U-Ga-In alloys, uranium forms the intermetallic compound UGa 3 . Activity coefficients and solubility of uranium in Ga-In eutectic were also determine d in the same temperature range. Partial thermodynamic functions of c-U in saturate d alloys wit h gallium, indium and Ga-In eutectic were calculated.

Crystal and electronic structure, optical absorption and transmission spectra, temperature dependences of conductivity and magnetic susceptibility were studied for copper intercalated ZrSe2 in the copper concentration range of 0 ≤ x ≤ 0.3.

The results of thermodynamic calculations of uranium and lanthanides (praseodymium and neodymium) and experimental data on separation of uranium and neodymium in "LiCl-KCl-CsClbased melt -Ga-In eutectic based alloy" are compared. Additionally the results of calculations of separation of Pr/U and Nd/U couples using liquid gallium, indium and their eutectic alloy at 723, 773 and 823 K are presented.

Activity, activity coefficients, and solubility of lanthanum and praseodymium in Ga-In eutectic alloy (21.8 wt.% In) were determined between 573 and 1073 K employing the e.m.f. method. In addition activity of these metals was also determined in alloys with indium in the same temperature range.