“…89°, 61.60° and 66.13°, which corresponds to (104), (002), (110), (111), (200), (202), (−202), (311),and (022) crystalline planes of monoclinic CuO, respectively (JCPDS Card No. 48–1548) [ 51 , 52 ]. The significant peaks of Fe 3 O 4 in XRD pattern of sample are observed at 2 θ = 31.61°, 35.53°, 45.33°, 53.41°, 56.89°, and 62.39°, assigned to the respective (200), (311), (220), (422), (511), and (440) crystallographic planes of cubic phase magnetite (JCPDS No.19-0629).…”