Investigation of the effect of fractional In3+ ion substitution on the structural, magnetic, and dielectric properties of Co-Cu ferrite

Novel Functional Soft Magnetic CoFe2O4/Fe Composites: Preparation, Characterization, and Low Core Loss

“…802.1 eV, and 785.5 eV, confirming the existence of Co 2+ species [24]. The XPS Fe 2p spectrum exhibited two peaks corresponding to Fe 2p1/2 and Fe 2p3/2 located at approximately 724.4 eV and 711.1 eV, respectively, with a typical satellite peak at approximately 719.4 eV, which were assigned to Fe in the 3+ oxidation state [25]. The survey spectrum of oxidized powder is shown in Figure 6c, which indicate the existence of cobalt, iron, oxygen, and carbon.…”

“…The electron binding energy of the Co 2p level was measured: the Co 2p1/2 and 2p3/2 peaks were located at approximately 795.7 eV and 780.2 eV, respectively, along with characteristic shake-up satellite peaks identified at approximately 802.1 eV, and 785.5 eV, confirming the existence of Co 2+ species [ 24 ]. The XPS Fe 2p spectrum exhibited two peaks corresponding to Fe 2p1/2 and Fe 2p3/2 located at approximately 724.4 eV and 711.1 eV, respectively, with a typical satellite peak at approximately 719.4 eV, which were assigned to Fe in the 3+ oxidation state [ 25 ]. The survey spectrum of oxidized powder is shown in Figure 6 c, which indicate the existence of cobalt, iron, oxygen, and carbon.…”

“…To study the evolution of the CoFe 2 O 4 /Fe composites during annealing, Figure 13 shows the XPS spectra taken from the samples after annealing at 500 °C, 550 °C and 600 °C for 1 h. The Fe 2p1/2 and Fe 2p3/2 peaks are located near 724.4 eV and 710.1 eV, respectively, with a more obvious satellite peak near 719.8 eV, indicating that the CoFe 2 O 4 is exposed on the surface, which proves that the silicone resin coating of the samples annealed at 500 °C was partially decomposed. In addition, As shown in Figure 13 b, a weak peak was surveyed near 706.5 eV, which corresponds to the Fe 2p3/2 peak of the metallic Fe, indicating that part of CoFe 2 O 4 is reduced to Fe during annealing [ 25 ]. Figure 13 c shows the samples annealed at 550 °C, the positions of Fe 2p1/2 peak and Fe 2p3/2 peak remain unchanged, but the satellite peak intensity corresponding to Fe 3+ near 719.8 eV is significantly higher than the test results at 500 °C, indicating that the silicone resin is further decomposed and more CoFe 2 O 4 is exposed to the particle surface.…”

Enhanced Humidity Sensing Response in Eu3+-Doped Iron-Rich CuFe2O4: A Detailed Study of Structural, Microstructural, Sensing, and Dielectric Properties

“…The rare earth-doped CuFe 2 O 4 ferrites have been used in many fields such as electronic devices, drug delivery systems, cancer therapy, and magnetic recording [1]. Rare earth-doped ferrites are also useful in high voltage electronics due to its negligible eddy current losses, high electrical resistivity, high permeability, magneto-optical, and magnetoresistive properties [2][3][4]. Generally, the trivalent ions are lesser in size than a divalent ion, and hence exchange of cations among the A and B sites plays a vital role in studying the structural, morphological, dielectric, and humidity sensing behavior of spinel copper ferrites.…”

“…Generally, the trivalent ions are lesser in size than a divalent ion, and hence exchange of cations among the A and B sites plays a vital role in studying the structural, morphological, dielectric, and humidity sensing behavior of spinel copper ferrites. Copper ferrite has considerable good attraction of potential applications in various devices, like cores in transformers and microwave absorption [3,4]. Copper ferrite nanoparticles can be prepared by various techniques like sol-gel method, coprecipitation method, solution combustion method, etc.…”