O/ 0.01 to 2.0(YO2 + WO + Z2 O5 + X2 O3)______________________________________ wherein e and f are the weighted average valences of M and R, respectively, M is an alkali or alkaline earth metal ion and R comprises an ion of the formula R1 R2 R3 R4 Q+, wherein Q is nitrogen or phosphorus and wherein at least one of R1, R2, R3 and R4 is selected from the group consisting of aryl of from