The phase diagrams of the systems PbBr2 + MeBr(Me=Li, Na, K, Rb, Cs, Tl) have been measured by visual and DTA methods.The structures and the thermal characteristics of the intermediate compounds have been pointed out by X-ray diffractometric technique and by DTA-calorimetric measurements, respectively.Moreover, the thermodynamic behaviour of these systems has been discussed.During the last few years, the study of systems containing lead bromide has caught the attention of many authors. In particular, for the systems formed by PbBr2 + MeBr (Me = alkali metal or thallium), Russian authors 1 have investigated various combinations of different salts including binary, ternary and reciprocal systems.The present work was undertaken to continue the study of the thermodynamic properties of systems formed by two salts with bi-monovalent cations and common anion 2 . In order to eliminate gaps found in the work of previous authors, particularly in the study of the solid phases, we have analyzed the systems formed by PbBr2 with (Li, Na, K, Rb, Cs and Tl)Br.Diffractograms taken on intermediate compounds enabled us to characterize the lattice parameters. Moreover, measurements of transition and fusion effects were carried out for compounds with congruent melting points, in order to discuss the solidliquid (SL) curves in the phase diagrams on the basis of structural models. Experimental SectionDTA measurements: The SL curves were measured by DTA and direct visual techniques already described 2 . For the determination of the heats of transition

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