Table 1.

Grain or crystallite size of the HT-Er₂O₃ NPs

2θ	hkl	FWHM	Grain or crystallite size (nm)
222	222	1.16335	7.37
400	400	1.06846	8.13
440	440	1.1669	7.79
622	622	1.35403	6.98
Average grain or crystallite size			D = 7.56 nm
Dislocation density			δ = 1/D2 = 0.0174 nm−2
Grain or crystallite size using Williamson-Hall method			11 nm
Dislocation density			δ = 1/D2 = 0.008 nm−2
Strain (ε)			0.0378