Radiative properties of rutile

L. González-Fernández1, L. del Campo2, D. De Sousa Meneses3,4, P. Echegut3, R. Pérez-Sáez1,5 and M. Tello1,5

1Departamento de Física de la Materia Condensada, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Bizkaia, Spain
2Departamento de Física Aplicada II, Facultad de Ciencia y Tecnología, Universidad del País Vasco, Bizkaia, Spain
3CNRS, UPR3079 CEMHTI, Orléans cedex 2, France
4Université d’Orléans, polytech’ Orléans, Orléans cedex 2, France
5Instituto de Síntesis y Estudio de Materiales, Universidad del País Vasco, Bilbao, Spain.

Keywords: FT-IR
property: radiative, optical, dielectric
material: rutile

Titanium dioxide and especially the rutile phase, is responsible for the high corrosion resistance of the Ti-6Al-4V alloy, which covers more than 50% of the industrial applications of titanium alloys. Moreover, TiO2 itself covers a wide range of applications, including its use in thin film coatings. Thus, to complete the study of the radiative properties of the Ti-6Al-4V in working conditions, as well as to improve design capabilities of thin film coatings, the rutile optical properties have to be taken into account.

In this work, the normal spectral emittance of the rutile phase was measured using two Fourier Transform Infrared (FT-IR) spectrometers between 40 and 11200 cm-1,from 500 to 2000 K, and for both polarizations of the tetragonal structure. The strong temperature and wavenumber dependences of the emittance are characterized by a strengthening of emission bands in the opaque zone and a large increase of the rather flat electronic contribution appearing in the semi-transparent region as the temperature rises, leading to nearly black body behaviour at high temperatures. The fitting of the experimental data with a dielectric function model allowed the retrieval of the optical functions of the rutile. Finally, all these results will be compared and discussed with the ones available in the literature.

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