Table 2. Average crystalline domain size, lattice parameter, unit volume, number of unit cells, number of domains, B factor, lattice distortion, and domain surface area in hcp Ru NPs obtained using the Rietveld refinement method.

Sample	1	2	3	4
Crystalline domain size (nm)	1.01	1.25	1.27	1.30
a (Å)	3.9113 ± 0.0045	3.8743 ± 0.0029	3.8670 ± 0.0029	3.8706 ± 0.0032
Unit volume (Å3)	59.8357	58.1527	57.8273	57.9858
Number of unit cells	8.90	17.79	18.53	19.93
Number of domains (×1016)	22.03	11.02	10.58	9.84
B factor (Å2)	0.62 ± 0.17	0.77 ± 0.14	0.80 ± 0.14	0.87 ± 0.15
Lattice distortion at (111) plane	0.0374	0.0370	0.0373	0.0357
Domain surface area (×1017 nm2)	7.059	5.411	5.362	5.224