Fig. 1.

(a) XRD pattern of silver (Ag)-doped cobalt ferrite nanoparticles using the sol-gel auto-combustion technique via chemical and green synthesis approach by using, (b) Allium sativam (garlic), and (c) Ocimum sanctum (tulsi); at different concentration of Ag and Co in a compound (Ag_x Co_1−x Fe₂O₄ where, x = 0, 0.005, 0.001, 0.02). The XRD pattern are confirmed with JCPDS No. 01-073-1963 for their spinel crystal structure. Reprinted with permissions from P. Mahajan et al., Vacuum 161 (2019) 389–397, Elsevier copyright 2019 [80]. (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)