Iron Nickel Oxide Bookmark Notes
(iron nickel oxide)
Topic: Iron Nickel Oxide (NiFe₂O₄)
What Is It?
Iron Nickel Oxide, commonly Nickel Ferrite (NiFe₂O₄), is a significant mixed metal oxide. It belongs to the ferrite family, specifically inverse spinel ferrites. It combines iron (Fe) and nickel (Ni) cations with oxygen (O) anions.
Crystal Structure
Adopts the inverse spinel crystal structure. In this arrangement, half the Fe³⁺ ions occupy tetrahedral sites. The Ni²⁺ ions and the other half of the Fe³⁺ ions occupy octahedral sites within the oxygen lattice. This specific ordering is crucial for its magnetic properties.
Magnetic Properties
NiFe₂O₄ is ferrimagnetic at room temperature. This means it possesses a spontaneous magnetization, like a ferromagnet, but arises from the antiparallel alignment of magnetic moments of different magnitudes (Ni²⁺ and Fe³⁺) on the two sublattices (tetrahedral and octahedral). It exhibits high electrical resistivity, making it suitable for high-frequency applications.
Key Applications
* Magnetic Cores: Widely used in inductors, transformers, and electromagnetic interference (EMI) suppression components due to its high resistivity and magnetic properties.
* Catalysis: Acts as a catalyst or catalyst support in various reactions, including hydrocarbon oxidation and water gas shift reactions.
* Gas Sensors: Utilized for detecting gases like ethanol, LPG, and chlorine due to changes in electrical resistance upon gas adsorption.
* Biomedical: Potential applications in magnetic hyperthermia for cancer treatment and as MRI contrast agents.
* Electrodes: Investigated as an electrode material for supercapacitors and batteries.
Synthesis Methods
Commonly synthesized via:
* Solid-State Reaction: Mixing and calcining nickel and iron oxide powders at high temperatures.
* Co-Precipitation: Mixing nickel and iron salt solutions followed by precipitation and calcination.
* Sol-Gel Process: Using metal alkoxides or salts to form a gel, then drying and calcining.
* Hydrothermal/Solvothermal: Using high-temperature/pressure aqueous or solvent-based reactions.
Important Notes
* Properties highly dependent on synthesis method, purity, and microstructure (grain size).
* Exhibits good chemical stability and corrosion resistance.
(iron nickel oxide)
* Magnetic characteristics (saturation magnetization, coercivity) can be tuned by doping or substituting other metal ions.
Inquiry us
if you want to want to know more, please feel free to contact us. (nanotrun@yahoo.com)