Table 2: Experimental samples: manufacturer information and references.
Polytype Mineral Name Grain Size Manufacturer Refractive Index Comments
$\alpha $-SiC synthetic diam. = 6.5 mm Charles & $n_{\rm o}$ = 2.654a round brilliant
  moissanite   Colvard, Ltd$^{\rm TM}$ $n_{\rm e}$ = 2.967 cut gem
$\alpha $-SiC 6H-SiC 2 $\mu $m powder; Alfa/Aesar $n_{\rm o}$ = 2.55, $n_{\rm e}$ = 2.59 (IR) hexagonal plates
  (gray, amber) surf. area = 9-11 m2 g-1 (Lot # C19H06) $n_{\rm o}$ =  $2.5531+(3.34\times 10^{4})\cdot \lambda^{-2}$, purity: 99.8%
        $n_{\rm e}$ =  $2.5852+(3.68\times 10^{4})\cdot \lambda^{-2}$b metals basis
$\alpha $-SiC 6H-SiC (blue-gray); several mm unknown $n_{\rm o}$ = 2.654a Hopper crystal;
  synthetic per crystal   $n_{\rm e}$ = 2.967 (i.e., intergrown
  carborundum       crystals)
$\alpha $-SiC 6H-SiC (green, 4-8 mm wide, Morion Co. $n_{\rm o}$ = 2.654a green: layered, hexagonal, flat
  yellow) 0.25-1.20 Car. each   $n_{\rm e}$ = 2.967 yellow: single crystal
$\beta $-SiC 3C-SiC wafer diam = 5 $\mu $m Rohm & Haas, $n_{\rm o, e}$ = 2.55b CVD wafer
  (fcc cubic)   Advanced Materials $n_{\rm o, e}$ =  $2.55378+(3.417\times 10^{4})\cdot \lambda^{-2}$ c purity: $\geq$99.9995%
      (Grade SC-001)    
$\beta $-SiC 3C-SiC gray diam. $\sim $2.5-25 $\mu $m Superior Graphite $n_{\rm o, e}$ = 2.55 $^{{\rm b}}$ equant (spherical)
  (fcc cubic)     $n_{\rm o, e}$ =  $2.55378+(3.417\times 10^{4})\cdot \lambda^{-2}$ c chips
a Indices of refraction for the O-ray ($n_{\rm o}$) and E-ray ($n_{\rm e}$) given for white light (Gaines et al. 1997) or IR $\lambda$ (Goldberg et al. 2001).
b Values for visible light (467 nm < $\lambda$ < 691 nm at T = 300 K; Schaffer & Naum 1969; Schaffer 1971). Formulae assume $\lambda$ in nanometers.


Source LaTeX | All tables | In the text