Dielectric and frequency dependent transport properties in magnesium doped CuFe2O4 composite

Formation, Structure and Magnetic Properties of MFe2O4@SiO2 (M = Co, Mn, Zn, Ni, Cu) Nanocomposites

“…The XRD pattern of CFO exhibited a broad diffraction halo in the range 15°–30° corresponding to the amorphous SiO 2 matrix and cubic spinel CoFe 2 O 4 crystalline single phase (JCPDS card no. 02-1045, [ 32 ])) indexed to (111), (220), (311), (222), (400), (422), (511), and (440) planes, belonging to Fd3m space group [ 2 , 3 , 33 ]; this confirms the good homogeneity and crystallization of the prepared compound [ 17 ]. The single CoFe 2 O 4 phase started to form at 300 °C due to the strong reducing atmosphere (CO) generated during decomposition, when amorphous, very reactive CoO and γ-Fe 2 O 3 were formed [ 34 , 35 , 36 , 37 , 38 ].…”

“…The SiO 2 matrix produces steric repulsion between nanoparticles, preventing uncontrolled aggregation [ 27 ]. The oxidation-reduction reactions also depend on the oxygen partial pressure and the presence of air during the annealing process [ 17 ]. In the cases of ZFO and CuFO, beside the main ZnFe 2 O 4 and CuFe 2 O 4 phases, a secondary SiO 2 (α-cristobalite) phase was also present.…”

“…The crystallite size is an important parameter to tailor the magnetic and optical properties of ferrites [4][5][6]. The average crystallite size (D CS ) was calculated using the most intense diffraction peak of (311) crystalline plane by Debye-Scherrer formula using Equation ( 1) [1,4,[6][7][8][15][16][17]20,23,[33][34][35][36][37][38]. The lattice parameter (a) calculated according to Equation (2) [6,7,16] is presented in Table 2.…”

“…These properties make them suitable for applications such as sodium-ion batteries, microwave absorbers, magnetic liquids, magnetic refrigeration, magnetic storage, dye removal, enhancement of water oxidation processes, magnetic recording, photocatalysis, ferrofluid technology, medical diagnostics, etc. [ 8 , 17 , 18 , 19 , 20 ]. Depending on the size and shape of particles, NFO exhibits paramagnetic or ferromagnetic behavior, while CuFO exhibits ferromagnetic behavior [ 18 ].…”

Investigation of Structural, Morphological and Magnetic Properties of MFe2O4 (M = Co, Ni, Zn, Cu, Mn) Obtained by Thermal Decomposition

“…CuFe 2 O 4 is a soft material with low coercivity, low-saturation magnetization, high electrical resistance, low eddy current losses, great resistance to corrosion, thermal stability, excellent catalytic properties and environmental benignity, and it is not readily demagnetized [ 12 , 14 , 24 , 25 ]. CuFe 2 O 4 shows ferromagnetic behavior with a single-domain state and is widely used in magnetic storage, catalysis, photocatalysis, pollutant removal from wastewater, color imaging, magnetic refrigeration, magnetic drug delivery and high-density information storage [ 8 , 12 , 24 , 25 , 26 ].…”