Patent ID: 7166415

Claim:
An optical information recording medium utilizing a crystalline state as a non-recorded state and an amorphous state as a recorded state, which employs a phase-change recording material in an initially crystallized state and having the composition of the following formula (1) as the main component: (Sb 1−x Sn x ) 1−y−w−z Ge y Te w M1 z formula (1) wherein each of x, y, z and w represents atomicity, x, z and w are numbers which satisfy 0.01≦x≦0.5, 0≦z≦0.3 and w=0, respectively, the the element M1 is at least one element selected from the group consisting of In, Ga, Pt, Pd, Ag, rare earth elements, Se, N, O, C, Zn, Si, Al, Bi, Ta, W, Nb and V; and (I) when z=0, y is a number which satisfies 0.1≦y≦0.3, and (II) when 0<z≦0.3, y is a number which satisfies 0.05≦y≦0.3.