Abstract
A study of thermodynamic properties and structure of sodium borosilicate glasses with a range of pressure-temperature histories is presented. It is demonstrated how differences in the pressure-temperature path of the liquid during cooling may result in glasses with identical short-range structure and molar volume but different potential energies and, thus, different mid- or long-range structures. Rates of changes of molar volume, excess enthalpy, and boron coordination with changing fictive pressure and fictive temperature are reported. A structure-energy map is given, and paths for transitions under constant pressure, as well as between different pressures are shown. It is shown for pressures between atmospheric and $500\phantom{\rule{0.3em}{0ex}}\mathrm{MPa}$ that similar rates of cooling produce similar relative variations in fictive temperature in boron coordination environment and in the potential energy as compared to a given reference state. These results indicate that the rate of configurational entropy generation is independent of pressure in this range.
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