Table 1: Peak position, intensity, and hkl values of possible secondary phases in Fe-doped CuO from XRD pattern.

CuOCuFe2O4Fe3O4Fe2O3

2θInt2θInthkl2θInthkl2θInt

35.66399935.54399931135.4439993 1 135.631719
46.4011447.29900933147.1620073 3 1
53.6157153.59607642253.4380884 2 254.066427
56.8630657.13525951156.9642815 1 1
65.9899665.97401053165.7700095 3 166.030003
75.2353575.24402762275.0020306 2 275.456059
87.1030987.05102264286.7540306 4 2
90.0641589.96408173189.6501027 3 1