Abstract. Al-Sn-Zn alloys are considered to be a good alternative for lead-containing solders; however, their physical properties at high temperatures are investigated insufficiently. In this work we have studied density (by gamma-absorption method), electrical resistivity (by contactless method in rotating magnetic field) and magnetic susceptibility (by Faraday's method) of some Al-Sn-Zn alloys containing up to 10 % of aluminum and up to 65% of zinc. The enlargement of zinc content resulted in the decrease in density and susceptibility values, except for one sample. The resistivity values practically didn't depend on zinc content in crystalline state, whereas it had maximum for one of the samples in liquid state, which might be attributed to the appearance of ternary high-melted intermetallic compound. The hysteresis, i.e. incoincidence of heating and cooling curves in electronic properties, which has been observed for tin-rich samples, might be due to irreversible transition from microheterogeneous state of the melt to true solution state. The work has been made in the frames of COST Action MP0602.

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The optical absorption, luminescence and EPR methods have been used to study LiH(D) single crystals doped with Ru2+. The formation of new absorption bands and EPR signal was observed after the illumination of crystals with light at T=77 K. The possible model of photostimulated processes in LiH(D):Ru crystals is presented.

The formation of two independent paramagnetic centres Ru(JT) and Ru(A) was detected by the EPR method LiH and LiD single crystals doped with ruthenium, after illumination with visible light at T=77 K. Both centres were assigned to Ru+ with low-spin 4d7 configuration. Ru(JT) centres exhibit a quasidynamical Jahn-Teller effect. The values of tunnelling splitting 3 Gamma and random-strain splitting delta were estimated to be 24 cm-1 and 6.0 cm-1, respectively. The Ru(A) centre was found to have tetragonal symmetry with the unpaired electron in a 4d(3z2-r2) orbital.

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