We report here on the preparation, X-ray diffraction with Rietveld refinement, AC susceptibility measurements and effect of heat treatments in (Y1-xSmx)SrBaCu3O6+z. Each sample was subject to two types of heat treatment: oxygen annealing [O] and argon annealing followed by oxygen annealing [AO]. For each x, the [AO] treatment increases the orthorhombicity epsiv = (b -a) / (b + a) (for 0 les x les 1), Tc (for x ges 0.4) and the distance d [Cu(1) - (Sr / Ba)] (decrease Tc ) for x < 0.5 and decrease it (increase Tc ) for x > 0.5 . When x increase from 0 to 1, epsiv decreases with Tc[O]. However, Tc[AO] decreases with epsiv until x = 0.2 and after it increases by 6 K to 85 K for x = 1 [AO]. A remarkable correlations were observed between Tc(x) and the volume of the unit cell V (x) ; and between deltaTc(x) = Tc[AO] - Tc[O] and deltaepsiv(x). A combination of several factors such as decrease in d [Cu(1) - (Sr / Ba)]; increase in cationic and chain oxygen ordering; the number psh(x) of holes by Cu(2) - O2 superconducting plans and in-phase purity for the [AO] samples may account for the observed data.