Abstract
The structures of B2O3 and two-component alkali silicate and alkali borate glasses and melts have been investigated by small-angle X-ray scattering at temperatures up to 1200°C. Structural inhomogeneities, with regions 15 Å in size, are present in B2O3 in the equilibrium supercooled liquid state. After rapid changes of temperature this submicroheterogeneous structure develops independently of the changes in the thermal density fluctuations. The rate of change in the heterogeneous structure is almost one order of magnitude more than that in the level of the thermal density fluctuations. This structure and its changes should be taken into account to explain the behaviour of the glass properties as a function of the thermal history of the sample. Chemical inhomogeneities due to supercritical fluctuations or clustering phenomena of a different type may also be present in two-component glasses and melts.
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