Zinc ferrites are a series of synthetic

inorganic compound An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds⁠that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as ''inorganic chemistry''. Inorgan ...

s of

zinc Zinc is a chemical element; it has symbol Zn and atomic number 30. It is a slightly brittle metal at room temperature and has a shiny-greyish appearance when oxidation is removed. It is the first element in group 12 (IIB) of the periodic tabl ...

and iron (ferrite) with the general formula of Zn_xFe_3−xO₄. Zinc ferrite compounds can be prepared by aging solutions of Zn(NO₃)₂, Fe(NO₃)₃, and

triethanolamine Triethanolamine, or TEOA, is an organic compound with the chemical formula . It is a colourless, viscous liquid. It is both a tertiary amine and a triol. A triol is a molecule with three alcohol groups. Approximately 150,000 tonnes were produ ...

in the presence and in the absence of

hydrazine Hydrazine is an inorganic compound with the chemical formula . It is a simple pnictogen hydride, and is a colourless flammable liquid with an ammonia-like odour. Hydrazine is highly hazardous unless handled in solution as, for example, hydraz ...

, or reacting

iron oxides An iron oxide is a chemical compound composed of iron and oxygen. Several iron oxides are recognized. Often they are nonstoichiometric, non-stoichiometric. Ferric oxyhydroxides are a related class of compounds, perhaps the best known of which is ...

and

zinc oxide Zinc oxide is an inorganic compound with the Chemical formula, formula . It is a white powder which is insoluble in water. ZnO is used as an additive in numerous materials and products including cosmetics, Zinc metabolism, food supplements, rubbe ...

at high temperature.

Spinel Spinel () is the magnesium/aluminium member of the larger spinel group of minerals. It has the formula in the cubic crystal system. Its name comes from the Latin word , a diminutive form of ''spine,'' in reference to its pointed crystals. Prop ...

(Zn, Fe) Fe₂O₄ appears as a tan-colored solid that is insoluble in water, acids, or diluted alkali. Because of their high opacity, zinc ferrites can be used as

pigment A pigment is a powder used to add or alter color or change visual appearance. Pigments are completely or nearly solubility, insoluble and reactivity (chemistry), chemically unreactive in water or another medium; in contrast, dyes are colored sub ...

s, especially in applications requiring heat stability. For example, zinc ferrite prepared from yellow iron oxide can be used as a substitute for applications in temperatures above . When added to high corrosion-resistant coatings, the corrosion protection increases with an increase in the concentration of zinc ferrite. One investigation shows that the zinc ferrite, which is

paramagnetic Paramagnetism is a form of magnetism whereby some materials are weakly attracted by an externally applied magnetic field, and form internal, induced magnetic fields in the direction of the applied magnetic field. In contrast with this behavior, ...

in the bulk form, exhibits

ferrimagnetism A ferrimagnetic material is a material that has populations of atoms with opposing magnetic moments, as in antiferromagnetism, but these moments are unequal in magnitude, so a spontaneous magnetization remains. This can for example occur wh ...

in nanocrystalline thin film format. A large room temperature magnetization and narrow ferromagnetic resonance line width have been achieved by controlling thin films growth conditions. Moreover, a flexible electrode for hybrid capacitors was developed using nanostructured Gadolinium doped zinc ferrite (GZFO), reinforced with carbon nanotubes (CNT), and supported on aluminum foil (AF). The GZFO/C@AF electrode exhibited high capacitance, long cycle life, and excellent energy and power density, making it a promising choice for wearable electronic device power sources. Recent advancements have explored the use of zinc ferrite in energy storage devices. Notably, a study published in ''

RSC Advances ''RSC Advances'' is an online-only peer-reviewed scientific journal covering research on all aspects of the chemical sciences. It was established in 2011 and is published by the Royal Society of Chemistry. The current editors-in-chief are Russell ...

'' in 2023 detailed the development of a flexible electrode for hybrid capacitors utilizing nanostructured gadolinium-doped zinc ferrite (GZFO). This material was reinforced with

carbon nanotubes A carbon nanotube (CNT) is a tube made of carbon with a diameter in the nanometre range (nanoscale). They are one of the allotropes of carbon. Two broad classes of carbon nanotubes are recognized: * ''Single-walled carbon nanotubes'' (''SWC ...

(CNTs) and supported on aluminum foil (AF), resulting in the GZFO/C@AF electrode. The electrode demonstrated a high specific capacitance of 887 F g⁻¹ at a current density of 1 A g⁻¹ and maintained 94.5% of its capacitance after 7000 charge–discharge cycles at 15 A g⁻¹. Additionally, it achieved an

energy density In physics, energy density is the quotient between the amount of energy stored in a given system or contained in a given region of space and the volume of the system or region considered. Often only the ''useful'' or extractable energy is measure ...

of 40.025 Wh kg⁻¹ and a

power density Power density, defined as the amount of power (the time rate of energy transfer) per unit volume, is a critical parameter used across a spectrum of scientific and engineering disciplines. This metric, typically denoted in watts per cubic meter ...

of 279.78 W kg⁻¹, indicating its potential for powering wearable electronic devices.

References

External links

* * ferrite Spinel group Ferrites {{inorganic-compound-stub

See also

References

External links