Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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A.Sediri, L.del Campo, L.Cosson, P.Echegut, M.Zaghrioui, P.Laffez, 'Thickness and Roughness Effect of Pr2NiO4+δ Coating on the Normal Spectral Emittance', Int. J. Thermophys. 44 172 (2023) doi:10.1007/s10765-023-03278-z

Pr2NiO(4+δ) coatings of rare earth nickelate oxide were prepared through RF magnetron co-sputtering, combined with an appropriate heat treatment. The study focused on optimizing the growth conditions to enhance the thermal emittance of the coatings, taking into account the influence of thickness and roughness. The research findings revealed interesting insights. Firstly, by analyzing room temperature infrared reflectivity and studying the temperature dependence of the normal spectral emittance in the range of 500 cm−1 to 5500 cm−1, it was observed that the total emittance increased as the coating thickness increased. However, this increase tended to approach a saturation value at higher thicknesses. Additionally, the study demonstrated that a coating thickness of 2.8 μm was sufficient to effectively shield the substrate's infrared thermal response. This suggests the potential application of these coatings for thermal management purposes. Furthermore, the influence of roughness on the emittance was predominantly observed in the spectral range of 1200 cm−1 to 3600 cm−1. This finding highlights the importance of considering surface roughness when designing coatings for optimal thermal properties. In summary, the research provided valuable insights into the growth conditions and the impact of thickness and roughness on the thermal emittance of Pr2NiO4+δ coatings. These findings contribute to the development of improved materials for thermal management and related applications.