Open Access
Table 1
Color, appearance, film thickness and optical properties of samples prepared at different temperatures with 0.0015 and 0.0035 mol/l concentrations of Fe and Mn, respectively.
| Sample | Preparation temperature (°C) | Color and homogeneity | Film thickness, in microns | Solar absorptance and emittance |
|---|---|---|---|---|
| (a) | 350 | Reddish, uniform | 1.011 | 0.75; 0.03 |
| (b) | 400 | Reddish, uniform | 0.749 | 0.76; 0.04 |
| (c) | 450 | Reddish, uniform | 1.170 | 0.89; 0.05 |
| (d) | 500 | Dark reddish, uniform | 1.008 | 0.78; 05 |
| (e) | 600 | Black, uniform | 0.450 | 0.94; 0.07 |
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