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In-situ high-temperature XANES spectra at the Ti-K edge demonstrate that the coordination number of Ti in Rb2~nSi40n in the glassy, supercooled and stable liquid regimes

In-situ high-temperature XANES spectra at the Ti-K edge demonstrate that the coordination number of Ti in Rb2~nSi40n in the glassy, supercooled and stable liquid regimes remains essentially unchanged at a mean value close to 5 up to a temperature of 1400 ° C . A slight increase in the intensity of the pre-edge peak with temperature can be taken as evidence for a minor decrease in the average coordination number of Ti (from ca. 5.0 in the glassy state to ca. 4.75 at 1400 °C). Introduction Most studies of melt structures have been performed on their quenched equivalents, i. e. glasses and assumed that these structures represent that of the melt near the glass-transition temperature (cf. Mysen, 1988). A limited temperature range (on the order of several tens of degrees) is accessible for such studies by changing the quench-rate (Dingwell and Webb, 1990). For covering a wider temperature range, in particular into the region of stable liquids, in-situ techniques have to be used instead. Such studies are rare, mostly because of methodological difficulties. It has been shown, however, that the main structural features such as the topology of the network remains unchanged with temperature in fully polymerized melts such as GeÜ2 (Seifert et al., 1981) and that, in •depolymerized melts, only rather subtle changes occur, such as in the connectivity of S 1 O 4 tetrahedra (i.e. the distribution of Q-species) via disproportionation reactions of the type Q 3 = Q 4 + Q 2 (Brandriss and Stebbins, 1988; Mysen and Frantz. 1992; Seifert et al.,