Thickness and Roughness Effect of Pr2NiO4+δ Coating on the Normal Spectral Emittance

• Published in: International journal of thermophysics Vol. 44; no. 12
• Main Authors: Sediri, A., del Campo, L., Cosson, L., Echegut, P., Zaghrioui, M., Laffez, P.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2023; Springer Nature B.V; Springer Verlag
• Subjects: Classical Mechanics; Coating effects; Condensed Matter Physics; Emittance; Geophysics; Heat treatment; Industrial Chemistry/Chemical Engineering; Infrared analysis; Infrared reflection; Magnetron sputtering; Optimization; Physical Chemistry; Physics; Physics and Astronomy; Room temperature; Spectral emittance; Substrates; Surface roughness; Temperature dependence; Thermal management; Thermal response; Thermodynamic properties; Thermodynamics; Thickness; Normal spectral emittance; Pr; Infrared; NiO; Black oxide
• ISSN: 0195-928X; 1572-9567
• DOI: 10.1007/s10765-023-03278-z

Pr 2 NiO (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 Pr 2 NiO 4+δ coatings. These findings contribute to the development of improved materials for thermal management and related applications.