Cu2+ and Al3+ co-substituted cobalt ferrite: structural analysis, morphology and magnetic properties

Abstract

Cu-Al substituted Co ferrite nanopowders, Co 1−x Cu x Fe 2−x Al x O 4 (0.0 ≤ x ≤ 0.8) were synthesized by the co-precipitation method. The effect of Cu-Al substitution on the structural and magnetic properties have been investigated. X-ray diffraction (XRD) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM) are used for studying the effect of variation in the Cu-Al substitution and its impact on particle size, magnetic properties such as M s and H c. Cu-Al substitution occurs and produce a secondary phase, α-Fe 2 O 3. The crystallite size of the powder calcined at 800 • C was in the range of 19-26 nm. The lattice parameter decreases with increasing Cu-Al content. The nanostructural features were examined by FESEM images. Infrared absorption (IR) spectra shows two vibrational bands; at around 600 (v 1) and 400 cm −1 (v 2). They are attributed to the tetrahedral and octahedral group complexes of the spinel lattice, respectively. It was found that the physical and magnetic properties have changed with Cu-Al contents. The saturation magnetization decreases with the increase in Cu-Al substitution. The reduction of coercive force, saturation magnetization and magnetic moments are may be due to dilution of the magnetic interaction.

Effect of Cu2+ substitution on structure, morphology, and magnetic properties of Mg-Zn spinel ferrite

“…The non-magnetic Cu resides in a tetrahedral (A) site whose doping can modify the structural, electrical, and magnetic properties (5)(6)(7) . Doping of Al (8,9) , Ge (10) , Cu (11) , Ni (12) , Cr (13) , Sm-Gd (14) , Ce-Gd (15) on magnesium ferrite and their effects on the electrical, dielectric and magnetic properties were studied (16)(17)(18) . However, solid-state synthesis was rarely used, which has a different impact on the sample size (19) .…”

Study of the structural, electrical, dielectric properties and transport mechanisms of Cu0.5Fe2.5O4 ferrite nanoparticles for energy storage, photocatalytic and microelectronic applications

“…It is therefore necessary to qualitatively describe the surface of the reaction products obtained by the self-combustion synthesis method which allowed us to obtain particles of nanometric size. Therefore, from a chemical point of view, a large surface area of particles tends to coalesce to form larger particles [ 38 ]. Moreover, the TEM image shown in Fig.…”

Characterization of Bi substitution of strontium cobalt zinc ferrites synthesized by micro-emulsion technique

“…Because of the replacement of lighter Bi ions for Fe ions, the tetrahedral extending constancy band slightly alters near to the high frequency province to promote Bi 2+ substitution devotion, as seen in figure 5. The absorption bands acquired in the extant revision is reliable to detect that the figure to increase in Bi fixing attention, the tetrahedral extending regularity band (ν1) because of the replacement of lighter Bi ions for Fe ions towards the advanced frequency province, there are small alterations [28].…”

“…Fig. 2 shows the respective FT-IR spectra of Sr 0.5 Co 0.4 Zn 0.4 Bi x Fe 2-x O 4 at different variation of x= 0.0, 0.05, 0.10, 0.15 [28]. The FTIR spectra of Sr based nanoparticles are displayed in Figure 5, and they exhibit two distinct bands in 4000 to 500 cm -1 region [29].…”