Patent ID: 8143181

Claim:
A glassy or crystal compound made from one or more noncentrosymmetric crystal-glass phase-change materials comprising one or more chalcogenide compounds having a structure of A 1-x A′ x PSe 6 S 6-y (A, A′=K, Rb, Tl, Ag, Cu; 0 ≦x <1; 0≦y<6), A 2-x A′ x P 2 Se 6 S 6-y (A, A′=K, Rb, Cs, Tl, Ag, Cu; 0≦x <1; 0≦y ≦6), or A 1-x A′ x PSe z (A, A′=K, Rb, Cs, Tl, Ag, Cu; 0 ≦x ≦1; 6 <z<12).