Table 3.
XRD d-spacingsa
| Smectite | Treatment | d001 (Å) | d02ℓ (Å)b | d060 (Å) |
|---|---|---|---|---|
| A | unaltered | 16.19(8) | 4.579(6) | 1.5636(2) |
| air-oxidized | 16.99(5) | 4.552(3) | 1.5584(2) | |
| re-crystallized | 15.18(4) | 4.601(5) | 1.5617(2) | |
| re-oxidized | 15.76(3) | 4.506(3) | 1.5249(2) | |
| peroxide | 15.61(4) | 4.519(2) | 1.5203(1) | |
| B | unaltered | 15.55(2) | 4.652(3) | 1.5523(2) |
| air-oxidized | 15.10(1) | 4.560(2) | 1.5400(1) | |
| peroxide | 15.43(1) | 4.513(2) | 1.5203(1) | |
| C | unaltered | 15.67(1) | 4.600(2) | 1.5385(1) |
| air-oxidized | 15.61(1) | 4.584(1) | 1.5381(1) | |
| re-crystallized | 15.87(1) | 4.573(1) | 1.5378(1) | |
| re-oxidized | 15.76(1) | 4.567(1) | 1.5358(1) | |
| peroxide | 14.98(1) | 4.530(1) | 1.5242(1) | |
| D | unaltered | 14.78(1) | 4.579(2) | 1.5321(1) |
| air-oxidized | 15.66(1) | 4.549(1) | 1.5318(1) | |
| peroxide | 15.00(1) | 4.522(1) | 1.5229(1) |
a
Uncertainty for final digit is given in parentheses.
b
Because of the high asymmetry of the (02ℓ) peak, we report as d(02ℓ) the peak fitting results for the (02ℓ) maximum.