Volume 43, BibTeX The spinel structure is formulated MM' 2 X 4, where M and M' are tetrahedrally and octahedrally coordinated cations, respectively, and X is an anion (typically O or F). Institutional subscribers have access to the current volume, plus a You do not need to reset your password if you login via Athens or an Institutional login. The structure of partially inverse spinel CoFe 2 O 4 as well as its electronic and magnetic properties through a systemic theoretical calculation of (Co 1−x Fe x) Tet (Co x Fe 2−x) Oct O 4 (x = 0, 0.25, 0.5, 0.75 and 1.0) have been investigated by the generalized gradient approximation (GGA) … Examples of Normal Spinels: MgAl2O4 (known as spinel), Mn3O4, ZnFe2O4, FeCr2O4(chromite) etc. It is found that the Co and Fe ions prefer their high spin configurations with higher spin moments at octahedral sites in all the studied cases, in line with experimental observations. NiAl2O4 for which the formula can be written as (Al0.75Ni0.25)tet [Ni0.75Al1.25]octaO4 is a Random Defected Inverse Spinel. Journal of Physics D: Applied Physics, The spinels have the general chemical formula AB2X4. So, the classic spinel structure of formula M (II)M' (III)2O4 has M (II) in the tetrahedral sites and M (III) in the octahedral sites. Find out more about journal subscriptions at your site. The space group for a spinel group mineral may be Fd3m (the same as for diamond), but in some cases (such as spinel itself, MgAl 2O 4) it is actually the tetrahedral F43m. Find out more. The structure of partially inverse spinel CoFe2O4 as well as its electronic and magnetic properties through a systemic theoretical calculation of (Co1−xFex)Tet(CoxFe2−x)OctO4 (x = 0, 0.25, 0.5, 0.75 and 1.0) have been investigated by the generalized gradient approximation (GGA) + U approach. Please choose one of the options below. 10-year back file (where available). In the normal spinel structure, there is a close-packed array of anions. If you have a user account, you will need to reset your password the next time you login. Phys. It has a common structural arrangement shared by many oxides of the transition metals with formula AB 2 O 4. Y H Hou1, Y J Zhao2, Z W Liu1, H Y Yu1, X C Zhong1, W Q Qiu1, D C Zeng1 and L S Wen1, Published 21 October 2010 • The CFSE of NiII is greater in octahedral than tetrahedral coordination. Spinel is the magnesium/aluminium member of the larger spinel group of minerals. Its name comes from the Latin word "spinella", which means spine in reference to its pointed crystals. To find out more, see our, Browse more than 70 science journal titles, Read the very best research published in IOP journals, Read open access proceedings from science conferences worldwide, First-principles investigations into the thermodynamics of cation disorder and its impact on electronic structure and magnetic properties of spinel Co(Cr, Air annealing effects on lattice structure, charge state distribution of cations, and room temperature ferrimagnetism in the ferrite composition Co, Probing optical band gaps at nanoscale from tetrahedral cation vacancy defects and variation of cation ordering in NiCo, Systematic analysis of structural and magnetic properties of spinel CoB. It has the formula MgAl2O4 in the cubic crystal system. Partially inverse spinel CoFe2O4, which may be prepared through various heat treatments, differs remarkably from the ideal inverse spinel in many properties. Form and we will follow up with your librarian or Institution on your behalf. D: Appl. 2010 IOP Publishing Ltd To gain access to this content, please complete the Recommendation For corporate researchers we can also follow up directly with your R&D manager, or the information Where: AII= a divalent cation like Mg, Cr, Mn, Fe, Co, Ni, Cu, Zn, Cd, Sn BIII= a trivalent cation like Al, Ga, In, Ti, V, Cr, Mn, Fe, Fe, Co, Ni X = O, S, Se etc. By continuing to use this site you agree to our use of cookies. You will only need to do this once. But Al3+ also has strong preference for octahedral sites due to high lattice energy. The computer you are using is not registered by an institution with a subscription to this article. The Co ions at the octahedral sites favour being far away from each other in the partial inverse spinels, which also show half metallicity at certain inversion degrees. RIS. Number 44, 1 School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, People's Republic of China, 2 Department of Physics, South China University of Technology, Guangzhou, 510640, People's Republic of China, Received 14 June 2010 management contact at your company. This site uses cookies. The structure of inverse Spinels.
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