A low-viscosity 60 SnO–40 P2O5 (mol%) glass was reheated at 280 °C (about 45 °C above the glass-transition temperature) for 20 min in various atmospheres (Ar, air, and O2), then the structure- and surface-related properties were examined. It was found that increase in textPtextO 2 {text{P}}_{{{text{O}}_{ 2} }} increases surface hardness, reduces optical transmittance, and improves chemical durability. The above phenomena are explained in terms of the increased oxidation tendency of Sn2+ to Sn4+ on the glass surface during reheating in increased textPtextO 2 {text{P}}_{{{text{O}}_{ 2} }} .
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