The phase diagrams of the systems ABr/SmBr3 were reinvestigated. The findings of Blachnik for the systems with A = Cs, Rb, K were confirmed; however, the dimorphic compound K3SmBr6 is stable only above 572 K. The equilibrium temperature, found by e.m.f.-measurements in a solid state galvanic cell for the reaction RBr+K2SmBr5 = L-K3SmBr6, is smaller (522 K). The formation temperature for Rb3SmBr6 is 279 K (DTA) and 256 K (e.m.f.) reap. By solution calorimetry was proved that the compounds Cs2SmBr5 and KSm2Br7 don't exist at 0 K. In the system NaBr/SmBr3 only one hitherto unknown dimorphic compound Na3SmBr3 exists above 473 K. L-Na3SmBr crystallizes in the hexagonal space group , above 519 K H-Na3SmBr6 has the monoclinic cryolite-structure. Powder patterns of other compounds not yet investigated - H/L-A(3)SmBr(6), ASm(2)Br(7) (A = Cs, Rb, K) and Cs2SmBr5 - were indexed analogously to known structure families. The structure parameters of SmBr3 . 6H(2)O were determined by single-crystal measurements.