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

I.M. Ermini (1) , L. Cosson (1) , F. Fayon (1) , D. Zanghi (1) , C. Tardivat (2) , D. de Sousa Meneses (1)

1 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation
2 LSFC - Laboratoire de Synthèse et Fonctionnalisation des Céramiques

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 rst 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 (Al 2 O 3 and SiO 2). The proposed method has high possibilities to be applied to dierent materials to enable the observation of fast structural transformations during liquid to solid phase change through the evolution of the dielectric function.

Mots clés: Real time FT-IR; Material emissivity; High temperature; Reflectance spectra; Solidification process

Domaines: Physique [physics]; Chimie inorganique

I.M. Ermini, L. Cosson, F. Fayon, D. Zanghi, C. Tardivat, et al.. Real time FT-IR observation of materials during their cooling from molten state. Infrared Physics and Technology, 2022, 127, pp.104424. ⟨10.1016/j.infrared.2022.104424⟩. ⟨hal-04309038⟩