Patent ID: 7498284

Claim:
A nitride glass with the general formula α x β y γ z , wherein α is at least one electropositive element chosen from the group consisting of Na, K, Rb, Be, Mg, Ca, Sr, Ba, Zr, Hf, Nb, Ta, W, Mo, Cr, Fe, Co, Ni, Zn, Sc, Y, La, Pb, Bi, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Mn, Ho, Er, Tm, Yb, Lu, Th, Pa and U; β comprises Si and optionally at least one element chosen from the group consisting of B, Ge, Ga and Al; and γ is N together with O, wherein in an atomic ratio of O:N, where O+N equals 100, O is in the range of 20-65 and N is in the range of 35-80; wherein x, y and z are all independently >0.