Research Article
Crystalline Swelling Process of Mg-Exchanged Montmorillonite: Effect of External Environmental Solicitation
Table 4
Structural parameters used to fit experimental patterns of SWy-2-Mg complex as a function of RH along the second hydration-dehydration cycle.
| | | % RH | % of MLS | % of 0W/1W/2W/3W- | L.Th | nH2O | ZH2O | ZMg | M | | 0W | 0W | 0W | 0W | | 1W | 1W | 1W | 1W | | 2W | 2W | 2W | 2W | | 3W | 3W | 3W | 3W |
| | Dehydration | 40 (start) | 60 | 0/0/100/0–R0 | — | — | — | — | | | 40 | 0/45/55/0–R0 | 12.35 | 2 | 10.60 | 10.60 | 9 | | | | 15.55 | 4 | 10.00/14.50 | 12.40 | | | | | — | — | — | — | | | 30 | 55 | 0/15/85/0–R0 | — | — | — | — | | | 45 | 0/45/55/0–R0 | 12.30 | 2 | 10.60 | 10.60 | 8 | | | | 15.28 | 4 | 10.00/14.50 | 12.40 | | | | | — | — | — | — | | | 20 | 62 | 0/45/55/0–R0 | — | — | — | — | | | 38 | 0/15/85/0–R0 | 12.30 | 1.8 | 10.60 | 10.60 | 10 | | | | 15.28 | 3.6 | 09.00/13.50 | 12.40 | | | | | | — | — | | | | | | — | | | | | | 10 | 75 | 0/75/25/0–R0 | — | — | — | — | | | 25 | 0/55/45/0–R0 | 12.25 | 1 | 10.60 | 10.60 | 11 | | | | 15.10 | 2.4 | 09.00/13.50 | 12.60 | | | | | | — | — | — | |
| | Hydration | 20 | 100 | 0/55/45/0–R0 | — | — | — | — | | | | | 12.15 | 2 | 10.70 | 10.70 | 10 | | | | 15.15 | 3.6 | 09.90/13.00 | 12.60 | | | | | — | — | — | — | | | 30 | 55 | 0/55/45/0–R0 | — | — | — | — | | 45 | 0/65/35/0–R1 | 12.20 | 2 | 10.30 | 10.30 | 10 | | | | 15.20 | 4.4 | 09.00/13.50 | 12.40 | | | | | — | — | — | — | | | 40 | 55 | 0/0/100/0 | — | — | — | — | 7 | | 45 | 0/45/55/0–R0 | 12.20 | 2 | 10.60 | 10.60 | | | | | 15.35 | 4 | 10.00/14.50 | 12.50 | | | | | — | — | — | — | | | 50 | 70 | 0/0/85/15–R0 | — | — | — | — | | | 30 | 0/45/55/0–R1 | 12.20 | 2 | 10.30 | 10.30 | 8 | | | | 15.60 | 4 | 10.00/14.80 | 12.50 | | | | | 18.20 | 5.8 | 09.90/14.50/16.70 | 14.50 | | | 60 | 85 | 0/0/70/30–R0 | — | — | — | — | | | 15 | 0/45/55/0–R0 | 12.20 | 2 | 10.70 | 10.70 | | | | | 15.60 | 4 | 10.00/14.60 | 12.40 | 10 | | | | 18.30 | 5.4 | 10.60/14.60/16.70 | 14.60 | | | 70 | | | — | — | — | — | | | 75 | 0/0/65/35–R0 | 12.30 | 2 | 10.70 | 10.70 | | | 25 | 0/40/60/0–R1 | 15.70 | 4 | 10.50/14.90 | 12.40 | 11 | | | | 18.30 | 6 | 10.60/14.50/16.20 | 14.50 | | | 80 | 75 | 0/0/60/40–R0 | — | — | — | — | | | 25 | 0/40/60/0–R1 | 12.30 | 2.2 | 10.30 | 10.30 | 12 | | | | 15.70 | 4.4 | 10.50/14.90 | 12.50 | | | | | 18.30 | 6.6 | 10.50/14.60/16.20 | 14.60 | | | Dehydration | 70 | 65 | 0/0/70/30–R0 | — | — | — | — | | | 35 | 0/60/40/0–R1 | 12.20 | 2.2 | 10.30 | 10.30 | | | | | 15.70 | 4.4 | 10.50/14.90 | 12.50 | 12 | | | | 18.20 | 6.6 | 10.50/14.60/16.20 | 14.60 | | | 60 | 65 | 0/0/85/15–R0 | — | — | — | — | | | 35 | 0/45/55/0–R1 | 12.30 | 2 | 10.20 | 10.20 | | | | | 15.70 | 4 | 10.50/14.80 | 12.50 | 11 | | | | 18.20 | 6 | 10.50/14.60/16.20 | 14.60 | | | 50 | 55 | 0/10/90/0–R0 | — | — | — | — | | | 45 | 0/45/55/0–R1 | 12.20 | 2 | 10.20 | 10.20 | | | | | 15.15 | 4 | 10.50/14.80 | 12.50 | 11 | | | | — | — | — | — | | | 40 (return) | 66 | 0/15/85/0–R0 | — | — | — | — | 12 | | 34 | 0/65/35/0–R1 | 12.00 | 2 | 09.70 | 09.70 | | | | | 15.15 | 4 | 10.00/14.50 | 12.40 | | | | | — | — | — | — | |
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nMg: number of H2O molecule per half unit cell fixed to 0.15, indicating full saturation of the cationic exchange capacity CEC of the minerals.
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