Table 1.

Rietveld refinement parameters for TiO₂-1% Fe-N hydrothermal samples.

Sample	Lattice Parameters (Å)			Crystallite Size (nm)	Phase Assignment/Abundance (wt %)
	a	b	c
Sample 1 (pH = 8.5)	3.7912	-	9.4909	12.3	Anatase 85.3
	9.1429	5.4215	5.2450	8.5	Brookite 14.7
Sample 2 (pH = 5.5)	3.7907	-	9.4743	10.4	Anatase 79.4
	9.1629	5.4437	5.1809	11.6	Brookite 20.6
Errors	±0.0005	±0.0005	±0.0005	±1.5	±1.4