Prediction of thermal radiative properties (300-1000 K) of La2NiO4+δ ceramics

A multiscale numerical model is developed to predict the thermal radiative properties (TRP) of rough La2NiO4+delta coatings. The model integrates intrinsic and extrinsic contributions related to the chemical composition and the texture, respectively. High-temperature infrared reflectivity and thermogravimetric measurements on a La2NiO4+delta single crystal make it possible to understand the role of the excess oxygen in the intrinsic TRP. We show that dense ceramics with thicknesses higher than 4 mu m are optically thick, and that one can adjust the surface roughness parameters to predict their TRP. (c) 2010 American Institute of Physics. [doi:10.1063/1.3511344]