Table 3.
Particle size and SSAext values of nanocrystalline mackinawite by different methods
| Method | Particle dimensiona | SSAext (m2/g) | Reference |
|---|---|---|---|
| XRPD, FWHM (K = 0.9) | 7.0 nm × 5.2 nm | 219 | this study |
| XRPD, IB (K = 1.05) | 8.0 nm × 4.3 nm | 220 | this study |
| XRPD, FWHM (K = 0.5) | 3.9 nm × 2.9 nm | 392 | this study |
| TEM | 21.7 nm × 7.5 nm | 103 | this study |
| EGME | 276b, 294c, 345d | this study | |
| PCS | 3.5 nm | 424 ± 130 | this study |
| BET | 53.0 ± 46.3 | Kornicker (1988) | |
| BET | 36.5 | Rickard (1997) | |
| BET | 0.05 | Butler and Hayes (1998) | |
| BET | 16–21 | Benning et al. (2000) | |
| BET | 80 | Wilder and Seward (2002) | |
| BET | 47 ± 1 | Wolthers et al. (2003) | |
| TEM | 20–400 nm | 4–73 | Wolthers et al. (2003) |
| SEM + XRPD | 10–35 nm | 40–140 | Rickard (1997) |
| Microscopy | 33 nm | 44 | Rickard (1975) |
| HR-TEM | (3–10.8) nm × (2-5.7) nm | 380 ± 10 | Ohfuji and Rickard (2006) |
| LAXRPD | 4.2 ± 0.5 nm | 350 | Wolthers et al. (2003) |
a
For single numbers, diameter is given; for paired numbers, length is followed by thickness.
b
Nc is estimated by FWHM at K = 0.9.
(c)
Nc is estimated by IB at K = 1.05.
d
Nc is estimated by FWHM at K = 0.5.