Real time FT-IR observation of materials during their cooling from molten state

A new methodology allowing real time observation of materials during their cooling, from the molten state to low temperature has been developed. This possibility originates from the implementation of a Rapid Scan feature on a FT-IR emissometer designed to probe materials submitted to extreme temperature conditions. Original time-resolved emissivity dependence during the phase transition are reported for the first time. The resulting out of equilibrium, dynamic, new data have been compared to the equilibrium, static, classical measurements to demonstrate the reliability of the new technique on two reference samples (Al2O3 and SiO2). The proposed method has high possibilities to be applied to different materials to enable the observation of fast structural transformations during liquid to solid phase change through the evolution of the dielectric function.

Automated summary

A new methodology has been developed to observe the real-time cooling process of materials, from the molten state to low temperature, using an FT-IR emissometer with a Rapid Scan feature. The time-resolved emissivity dependence during phase transition is reported for the first time, and the new dynamic data are compared with equilibrium measurements to demonstrate the reliability of the technique. The proposed method has the potential to be applied to different materials in order to observe fast structural transformations during liquid to solid phase change by analyzing the evolution of the dielectric function.