What is spinel ferrite?
A spinel ferrite is a complex oxide crystal structure with a face-centered cubic core and a unit formula of AFe2O4. This can be formed from the combination of a trivalent cation (Fe3+) and another divalent metallic cation, such as either a transition or post-transition metallic cation (A = Mn, Mg, Co, Ni, Zn).
What is structure of ferrite?
A ferrite is a ceramic material made by mixing and firing large proportions of iron(III) oxide (Fe2O3, rust) blended with small proportions of one or more additional metallic elements, such as strontium, barium, manganese, nickel, and zinc.
How do you make zinc ferrite?
Zinc ferrite powder was prepared by two steps in first step the stoichiometric amount of zinc chloride (ZnCl2) dissolved in distilled water and allowed to react with sodium hydroxide (NaOH) solution dissolved in distilled water with vigorous stirring and in second step a solution of ferric chloride FeCl3.
What is spinel ferrite nanoparticles?
Spinel ferrite nanoparticles (NPs) are in the spotlight of current nanoscience due to immense application potential. Very interesting aspects of the spinel ferrite NPs are their excellent magnetic properties often accompanied with other functional properties, such as catalytic activity.
Where is spinel found?
Spinel can be found on several continents, from Brazil in South America, Kenya in Africa, and especially across the southern portion of Asia, stretching from Afghanistan to Vietnam. It has been commonly found in gravel beds in Sri Lanka, Tanzania, and Madagascar, and marble deposits in Vietnam.
Is ferrite FCC or BCC?
Ferrite is a common constituent in steels and has a Body Centred Cubic (BCC) structure [which is less densely packed than FCC].
What is austenite structure?
Austenite is a solid solution of mostly iron and carbon. It has a face-centered cubic crystal structure. Austenite only forms when an iron-based alloy is heated above about 750°C (1382°F) but not above about 1450°C (2642°F).
Why is MgFe2O4 inverse spinel?
In fully “inverse” spinels, the tetrahedral (IV) site contains only B cations and the octahedral (VI) site contains an equal number of A and B cations, so the octahedral site is disordered. MgFe2O4 is partly inverse and partly normal and is, therefore, one of the most interesting ferrite spinels (Paladino 1960).
Why is ZnFe2O4 normal spinel?
Conventionally ZnFe2O4 has a normal spinel structure with Zn2+ cations occupying octahedral sites10. However, the cation distribution in spinel ferrites and thus zinc-ferrite, is greatly influenced by the synthesis procedure, especially when nanosized particles are obtained11-15.
What is an spinel ferrite?
Spinel ferrites have been investigated in recent years for their useful electrical and magnetic properties and applications in information storage systems, magnetic bulk cores, magnetic fluids, microwave absorbers and medical diagnostics.
What are magnetic nanoparticles of spinel ferrites?
Magnetic nanoparticles of spinel ferrites are of great interest in fundamental science, especially for addressing the fundamental relationships between magnetic properties and their crystal chemistry and structure.
Can microemulsions be used as nanoreactors for spinel ferrite synthesis?
It also describes the important magnetic properties of these spinel ferrites. The focus then shifts to the use of microemulsions as nanoreactors for the synthesis of spinel ferrites. This work gives a short review on the various synthesis methods of spinel ferrites in microemulsions in the recent years. 1. Introduction
Why are ferrites used in high frequency circuits?
At high frequencies the use of ferrites is relatively more routine as compared to that of other circuit components whose performance needs improvement. An important factor in choosing ferrites is that they are generally cheaper than magnetic metals and alloys.