Transition steel oxides, which embody many stoichiometric variations, are shaped into numerous crystal buildings by the atomic association of cations and anions in accordance with stoichiometric composition and are used for a variety of purposes primarily based on this. Amongst them, cobalt oxide, which has large crystal buildings relying on lattice factors of anion and the valence of Co cation, from its hydroxide formulation, is attracting numerous consideration as a result of its fascinating catalytic properties as a result of its crystal construction. On this examine, utilizing the synthesized Co(OH)2 nanosheets, the real-time habits of the part transition that happens when steady warmth is utilized to the pattern has been systematically analyzed utilizing an aberration-corrected scanning transmission electron microscope. The layered Co(OH)2 part passes by hexagonal CoO and cubic CoO phases to lastly grow to be Co particles, however when the temperature is dropped within the hexagonal part, spinel Co3O4 is shaped. These outcomes recommend that numerous phases included in transition steel oxides will be selectively carried out in accordance with temperature vary management.