| Abstract: | Structural information of liquid oxide melts including statements concerning their basicity are important not only for the metallurgy of steelmaking but also for the refractory industry, for ceramic productions and for glass manufacturing. After the introduction of infrared emission spectroscopy of liquid melts up to 1600°C it is now possible to receive UV/VIS-spectra of these melts in different atmospheres. The comparison to already published spectra is possible by recording spectra of quenched samples at room temperature with the same optical system as the high temperature ones. The suitability of the Fe- and Cr-Ions as test-ions for the indications of the features of liquid aluminate melts is discussed. A new spectroscopical method for the investigation of melts above 1450°C was developed. Octahedral-coordinated Fe3+ causes intensive charge-transfer (CT) absorptions in the melts. These CT-bands shift towards higher wavelengths and get broader and more intensive at higher temperatures; the results are discussed by the use of the Urbach-approximation. The CT-bands of Cr(VI) are attached to various chromate species. The properties of liquid silicates will be the subject of a later investigation. |
