The Ru-Sn liquid-solid and some solid-solid equilibria have been compl
etely revised by means of differential thermal analysis, X-ray powder
diffraction and microprobe investigations. The existence of two interm
etallic phases has been clearly established: Ru(0.4)Sn(0.6)decomposed
by a peritectic reaction at 1266(+/-4)degrees C and Ru0.3Sn0.7 congrue
ntly melting at 1257(+/-2)degrees C.