Structural Changes in Two Different Types of Oxide Glass Melts: Borates and Metaphosphates

X-ray diffraction experiments of molten oxide glasses, which give new insights into the structure of melts, were carried out. Using modern means (synchrotron radiation, image plates, container-less hightemperature technique) it could be shown that the short range order of melt and solid glass is often qualitatively different. If vitreous B203 or binary borate glasses with low content of network modifier are heated up above T&, the network topology begins to alter. With rising temperature more and more of the boroxol groups are replaced by independent B03 groups. While melting a metaphosphate glass, however, structural changes of another kind take place. In solid glass the environment of the network modifier ions is similar to the one found in crystalline modifications, and their distances to the surrounding P04 tetrahedra have narrow distributions. In the melt, however, these distances scarcely become evident, probably owing to the increased thermal motion of the modifier ions.