Preparation and characterization of spinel nickel ferrite obtained by the soft mechanochemically assisted synthesis

Synergistic Coupling of Anionic Ligands To Optimize the Electronic and Catalytic Properties of Metal–Organic Framework-Converted Oxygen-Evolving Catalysts

“…The existence of two oxidation peaks indicates that Ni 2+ in the catalysts may reside in two different coordination environments, similar to some reported multimetallic OER catalysts. , This deduction was further supported by Raman characterizations of the different catalysts before and after OER tests (detailed discussion on the Raman spectra shown in Figures S4 and S5). Raman modes of the catalysts, especially after OER, reveal the presence of NiFe 2 O 4 and Ni­(OH) 2 phases with the Ni 2+ residing either in a Ni–O–Fe or a Ni–O–Ni motif, respectively. ,, It is suggested that the oxidation peak adjacent to OER onset potential ( V O2 ) represents the chemical environments of active OER catalytic sites. ,, Thus, in light of the well-known inductive effects between Fe 3+ and Ni 2+ sites, − the Ni–O–Fe motif should account for the V O2 peak of the catalysts. As such, V redox was extracted from V O2 and V R of Ni 2+ /Ni 3+ (Figure S18).…”

Photo-Fenton degradation of ammonia via a manganese–iron double-active component catalyst of graphene–manganese ferrite under visible light

“…The D value based on the Debye-Scherrer equation is consistent with that obtained from the TEM observations. , where A and B represent tetrahedral and octahedral sites, respectively [37]. The FT-IR spectra show two characteristic bands.…”

Microstructural, magnetic, and hyperfine characterizations of Cu‐doped cobalt ferrite nanoparticles

“…The significant growth in spinel ferrite research is mainly due to their potential applications in diverse field such as magnetic storage, magnetic resonance imaging, ferrofluid technology, microwave and radio frequency devices, water purification technology, sensors, and targeted drug delivery etc . Bulk cobalt ferrite is a well‐known hard magnetic material with moderate saturation magnetization, high coercivity, high Curie temperature, high magneto crystalline anisotropy, excellent mechanical hardness, good chemical stability, and electrical insulation . Cobalt ferrite has cubic inverse spinel structure with high degree of inversion (inversion parameter i = 0.80) and exhibits ferrimagnetism ( T c = 860 K) at room temperature.…”

“…1 Bulk cobalt ferrite is a well-known hard magnetic material with moderate saturation magnetization, high coercivity, high Curie temperature, high magneto crystalline anisotropy, excellent mechanical hardness, good chemical stability, and electrical insulation. 2 Cobalt ferrite has cubic inverse spinel structure with high degree of inversion (inversion parameter i = 0.80) and exhibits ferrimagnetism (T c = 860 K) at room temperature. The origin of this ferrimagnetic ordering in cobalt ferrite is due to superexchange (A-O-B) interaction between tetrahedral (A) and octahedral (B) sublattices which is stronger than both A-O-A and B-O-B intra-sublattice interactions.…”