Cobalt ferrite Coercivity Magnetization Introduction The sol ndash gel
Fig. 1 displays the FTIR spectra of the whole series of samples. The curves include OG-L002 peaks at 420, 500, 600, 1128, 1385, 1625, 2350 and, 3434 cm−1. The three strong signals appearing around 570–600, 470, and 420 correspond to the characteristic bonds of representing stretching vibration of iron and cobalt bonds with oxygen. These are metal–oxide bonds in the cobalt ferrite crystal lattice which reveal the formation of cobalt ferrite. The peaks at wave number of 1128 cm−1 are related to bond formation during the synthesis process of cobalt ferrite. The peaks with wave number of 1385 cm−1 are due to stretching vibration of nitrate groups, indicating that nitrate ions are present in the calcined samples. The peaks appearing around 1625 cm−1 are due to asymmetric stretching of carbonyl groups. Also, the peaks appearing around 2350 cm−1 confirm the presence of carbonyl groups. The peaks at 3434 cm−1 are due to stretching vibration of bonds of water and the broad nature of these peaks is related to the presence of hydrogen-bonded chains. In the IR spectra of all samples within the range of 800–400 cm−1, the typical metal–oxygen absorption bonds confirm the formation of the spinel structure of cobalt ferrite. The IR spectra of these compounds suggest that the hydroxyl carboxylate groups are coordinated to the metal ions through and groups. It must be noted that C, N, and O atoms form functional groups. According to the low intensity of these functional groups, it is concluded that the reaction occurring between elements such as C, N, and O on the atomic scale during the synthesis process leads to the formation of these functional groups at low levels.