Reliable, with one-point correction of energy scale
Comment:
A mixture of reagent-grade AgNO3 and NH4H2PO4 in appropriate proportions was preheated (T = 573 K, time = 30 min) and then melted (T = ~ 873 K, time = 30 min) and quenched. The area ratio of the non-bridging/bridging oxygen components was 1.196.