Interlamellar Space Configuration under Variable Environmental Conditions in the Case of Ni-Exchanged Montmorillonite: Quantitative XRD Analysis

Table 2

Structural parameters used to reproduce experimental patterns of SWy-2-Ni as a function of RH along the first cycle.

	% RH	Layer type	L. Thck					Total contribution; 0W/1W/2W/3W
Hydration procedure	40 (start)	0W	—	—	—	—	—	0/46.4/53.6/0	8
		1W	12.00	1.5	10.50	0.15	10.50
		2W	15.75	3.6	11.30/14.50	0.15	12.80
		3W	—	—	—	—	—
	50	0W	—	—	—	—	—	0/36.60/63.40/0	9
		1W	12.30	1.7	10.00	0.15	10.00
		2W	15.75	3.8	11.30/14.50	0.15	12.80
		3W	—	—	—	—	—
	60	0W	—	—	—	—	—	0/13.50/70.10/16.40	9
		1W	12.65	1.7	10.20	0.15	10.20
		2W	15.85	4.2	11.00/14.00	0.15	12.80
		3W	18.60	5.4	10.00/14.50/16.20	0.15	14.50
	70	0W	—	—	—	—	—	0/17.47/54.33/28.20	8
		1W	12.00	2	10.50	0.15	10.50
		2W	15.80	4.8	10.70/14.60	0.15	12.60
		3W	18	6	10.20/14.70/16.50	0.15	14.70
	80	0W	—	—	—	—	—	0/13.30/41.34/45.36	8
		1W	12.80	1.8	10.00	0.15	10.00
		2W	15.85	5	11.00/13.50	0.15	12.40
		3W	18.70	6.6	10.30/14.30/16.30	0.15	14.30
Dehydration process	70	0W	—	—	—	—	—	0/19.34/58.90/4.41	8
		1W	12.30	2	10.00	0.15	10.00
		2W	15.80	4.4	10.90/14.70	0.15	12.70
		3W	18.50	6.6	10.50/14.90/16.20	0.15	14.90
	60	0W	—	—	—	—	—	0/24/58.50/17.50	7
		1W	12.60	1.5	9.90	0.15	9.90
		2W	15.60	4	11.00/14.30	0.15	12.70
		3W	18.50	5.4	10.70/14.50/16.50	0.15	14.50
	50	0W	—	—	—	—	—	0/28.98/62.35/8.67	8
		1W	12.20	1.5	10.00	0.15	10.00
		2W	15.70	4	11.00/14.30	0.15	12.70
		3W	18.20	5.4	10.70/14.50/16.50	0.15	14.50
	40	0W	—	—	—	—	—	0/37.50/62.50/0	8
		1W	12.20	1.5	10.20	0.15	10.20
		2W	15.65	4	11.00/14.30	0.15	12.70
		3W	—	—	—	—	—
	30	0W	—	—	—	—	—	0/55.50/44.50/0	8
		1W	12.20	1.5	10.40	0.15	10.40
		2W	14.90	4	11.00/14.50	0.15	12.70
		3W	—	—	—	—	—
	20	0W	10.50	—	—	0.15	8.90	31.45/61.80/6.75/0	9
		1W	12.75	1.4	10.00	0.15	10.00
		2W	14.90	4	11.00/14.00	0.15	12.70
		3W	—	—	—	—	—
	10	0W	10.15	—	—	0.15	8.90	45/55/0/0	7
		1W	12.60	1.4	10.00	0.15	10.00
		2W	—	—	—	—	—
		3W	—	—	—	—	—
Hydration	20	0W	10.15	—	—	0.15	8.90	32/68/0/0	8
		1W	12.30	1.4	10.00	0.15	10.00
		2W	—	—	—	—	—
		3W	—	—	—	—	—
	30	0W	10.50	—	—	0.15	8.90	22.95/63.50/13.55/0	7
		1W	12.40	1.4	10.50	0.15	10.50
		2W	15.60	3	11.00/14.00	0.15	12.65
		3W	—	—	—	—	—
	40 (return)	0W	—	—	—	—	—	0/58.20/41.80/0	6
		1W	12.60	1.5	10.00	0.15	10.00
		2W	15.20	4	11.00–14.50	0.15	12.80
		3W	—	—	—	—	—

Note: layer thickness (L. Thck in Å). : number of H₂O molecules for hydrated layers (per O₂₀ (OH)₄). : position of H₂O molecule along the axis. : number of exchangeable cations per half-unit cell. : position of exchangeable cations per half-unit cell calculated along axis respectively, for 2W, 1W, and 0W, and : average layer number per stacking.