Table 1.

Lattice parameters of and crystallite sizes of CeONP

CeO2 samples	Lattice parameter (nm)	Crystal size (nm)
Undoped	0.5412	8.9
Al3+-doped	0.5413	7.9
Cr3+-doped	0.5412	8.6
Cu2+-doped	0.5416	8.6
Ag+-doped	0.5420	8.1

Notes: The lattice parameter was fitted to a cubic cell, based on the line positions of ten X-ray diffraction peaks. The crystallite size is calculated with the Scherrer formula using FWHM of the (111) diffraction line.

Abbreviations: CeONP, cerium oxide nanoparticles; CeO₂, cerium oxide; FWHM, full width at half maximum.