Analysis of Polymorphic Nanocrystals of TiO₂ by X-Ray Rietveld Refinement and High-Resolution Transmission Electron Microscopy: Acetaldehyde Decomposition

Table 1

DRX-Rietveld refinement, phase concentration, and crystal size of the sol-gel TiO₂ samples.

Sample	Structure	Phase (%)	Crystal size (nm)	Scherrer crystal size (nm)	Phase	a (nm)	b (nm)	c (nm)
TiO2-P200	Tetragonal	62.88	6.9	7.03	Anatase	0.3790926	0.3790926	0.9495732
	Orthorhombic	37.12	6.0	18.26	Brookite	0.9167624	0.5416461	0.5210546
TiO2-P500	Tetragonal	82.67	20.5	22.04	Anatase	0.3786167	0.3786167	0.9506104
	Orthorhombic	14.90	13.1	34.02	Brookite	0.9142567	0.5442068	0.5191934
	Monoclinic	2.43	34.7	27.14	Rutile	0.4591337	0.4591337	0.2951845