Table 1
Sample composition and parameters for the computation of the optical constants and their extrapolation to short and long wavelengths.
| Sample name | Composition | Density (g cm−3) | nvis | Shape | Axis ratio (a/b) | λNIR (µm) | λFIR(4) (µm) |
|---|---|---|---|---|---|---|---|
| X35 (1) | (0.65)MgO–(0.35)SiO2 | 2.7 | 1.61 | Prolate | 1.5 | 5 | 1000 |
| X40 (2) | (0.60)MgO–(0.40)SiO2 | 2.7 | 1.52 | Prolate | 1.5 | 5 | 1000/500/500 |
| X50A (3) | (0.5)MgO–(0.5)SiO2 | 2.7 | 1.55 | Prolate | 1.5 | 5 | 750 |
| X50B (3) | (0.5)MgO–(0.5)SiO2 | 2.7 | 1.55 | Prolate | 1.5 | 5 | 750/850/1000 |
| E10 | Mg0.9 Fe0.1 SiO3 ;Fe3+ | 2.8 | 1.56 | Prolate | 2 | 5 | 650 |
| E20 | Mg0.8 Fe0.2 SiO3 ;Fe3+ | 2.9 | 1.58 | Prolate | 2 | 5 | 1000 |
| E30 | Mg0.7 Fe0.3 SiO3 ;Fe3+ | 3.0 | 1.62 | Prolate | 2 | 5 | 650 |
| E40 | Mg0.6 Fe0.4 SiO3 ;Fe3+ | 3.1 | 1.65 | Prolate | 2 | 5.4 | 750 |
| E10R | Mg0.9Fe0.1 SiO3 ; Fe2+ | 2.8 | 1.56 | Prolate | 2 | 5 | 800 |
| E20R | Mg0.8 Fe0.2 SiO3 ;Fe2+ | 2.9 | 1.58 | Prolate | 2 | 5 | 800 |
| E30R | Mg0.7 Fe0.3 SiO3;Fe2+ | 3.0 | 1.62 | Prolate | 2 | 5 | 900 |
| E40R | Mg0.6 Fe0.4 SiO3;Fe2+ | 3.1 | 1.65 | Prolate | 2 | 5 | 850 |
Notes. (1)Mean composition close to Mg2SiO4.(2)Intermediate composition between MgSiO3 and Mg2SiO4.(3)Mean composition of MgSiO3 ; the two samples have different structures at the nanometer scale. (4)If more than one value is indicated, they correspond to the spectra measured at 300 K, 100 K, and 30–10 K respectively, otherwise the same value for λFIR is adopted for all the temperatures.
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