Abstract
1. Isotopic exchange between beryllium, magnesium, calcium, strontium, and barium silicates (MO·SiO2) and molecular oxygen was studied, and it was shown that the exchangeable oxygen is a small proportion (0.1–3%) of the surface oxygen. 2. The equivalence of the exchangeable oxygen with respect to exchange with18O was established. 3. The oxygen in the free alkali-earth metal oxides which form a separate phase on the surface of the MO·SiO2 primarily participates in the exchange. 4. Modification of MO·SiO2 with phosphorus results in a decrease in the mobility of the oxygen.
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