Magnetic nanocluster formation of Fe ions embedded in SiO2and Al2O3substrates

MRS Advances ◽  
2018 ◽  
Vol 3 (42-43) ◽  
pp. 2603-2608
Author(s):  
K. Bharuth-Ram ◽  
C. Ronning ◽  
T. B. Doyle
Keyword(s):  
Transition Metal ◽  
Magnetic Behaviour ◽  
Research Focus ◽  
Host Matrix ◽  
Superparamagnetic Relaxation ◽  
Magnetization Measurements ◽  
Ferromagnetic Behaviour ◽  
Conversion Electron Mossbauer Spectroscopy ◽  
Fe Ions ◽  
Extrinsic Effects

ABSTRACTResearch focus in recent years on magnetic behaviour of transition metal (TM) ions embedded in semiconductors has shifted from intrinsic effects to extrinsic effects such as the formation of nanoclusters of the TM ions and the influence of the host matrix on their magnetic behaviour. Our studies, using conversion electron Mössbauer Spectroscopy and magnetization measurements, on SiO2and Al2O3substrates implanted with 4 at. % Fe, show ferromagnetic behaviour of α-Fe clusters in amorphous SiO2, but α-Fe2O3clusters displaying superparamagnetic relaxation in crystalline Al2O3.

On the magnetic behaviour of some UvT compounds (v ev Al, Ga, Sn; T ev Transition metal)

1986 ◽  
Vol 121 ◽  
pp. 169-174 ◽  
Author(s):  
V. SechovskÝ ◽  
L. Havela ◽  
L. Neuv̌il ◽  
A.V. Andreev ◽  
G. Hilscher ◽  
...  
Keyword(s):  
Transition Metal ◽  
Magnetic Behaviour

scholarly journals Synthesis and structural characterization of transition metal dithiolene derivatives containing divalent metals as counter-cations

CrystEngComm ◽  
2019 ◽  
Vol 21 (9) ◽  
pp. 1423-1432 ◽  
Author(s):  
Oscar Castillo ◽  
Esther Delgado ◽  
Diego Hernández ◽  
Elisa Hernández ◽  
Avelino Martín ◽  
...  
Keyword(s):  
Coordination Polymer ◽  
Transition Metal ◽  
Structural Characterization ◽  
Metal Cations ◽  
Magnetic Behaviour ◽  
Divalent Metal ◽  
Divalent Metals ◽  
Divalent Metal Cations ◽  
1D Coordination Polymer

Complexes containing [Fe2(SC6H2Cl2S)4]2− or [Ni(SC6H2Cl2S)2]− entities and divalent metal cations as well as an 1D-coordination polymer K/Zn have been obtained and their magnetic behaviour studied.

The relationship between magnetic behaviour and local structure around Fe ions in Fe-doped TiO2 rutile

2009 ◽  
Vol 404 (18) ◽  
pp. 2838-2840 ◽  
Author(s):  
A.M. Mudarra Navarro ◽  
V. Bilovol ◽  
A.F. Cabrera ◽  
C.E. Rodríguez Torres ◽  
F.H. Sánchez
Keyword(s):  
Local Structure ◽  
Magnetic Behaviour ◽  
Doped Tio2 ◽  
The Relationship ◽  
Tio2 Rutile ◽  
Fe Ions

TEMPERATURE-DEPENDENT ELECTRONIC STRUCTURE AND MAGNETIC BEHAVIOUR OF MOTT INSULATORS

1993 ◽  
Vol 07 (01n03) ◽  
pp. 333-336
Author(s):  
W. NOLTING ◽  
L. HAUNERT ◽  
G. BORSTEL
Keyword(s):  
Magnetic Properties ◽  
Electronic Structure ◽  
Theoretical Model ◽  
Transition Metal ◽  
Magnetic Behaviour ◽  
Mott Insulators ◽  
Temperature Dependent ◽  
Electronic And Magnetic Properties ◽  
Coulomb Correlations

The temperature-dependent electronic and magnetic properties of transition metal monoxides are calculated by use of a theoretical model which takes into account strong 3d Coulomb correlations and 2p-3d hybridization.

scholarly journals Magnetic Behaviour of Implanted Transition Metal Probes at Different Lattice Sites in Metals

1998 ◽  
Vol 51 (2) ◽  
pp. 157 ◽  
Author(s):  
D. Riegel ◽  
W. D. Brewer
Keyword(s):  
Transition Metal ◽  
Kondo Effect ◽  
Theoretical Work ◽  
Heavy Ion ◽  
Magnetic Behaviour ◽  
Special Importance ◽  
Electron Configuration ◽  
Distribution Method ◽  
Recoil Implantation ◽  
Basic Features

Usually, the occurrence of magnetism on isolated, substitutional 3d, 4d and 5d impurity ions in metals is restricted to certain 3d ions (mainly Cr, Mn, Fe, Co, Ni) in alloying metallic systems. The application of the perturbed γ-ray distribution method following heavy ion reactions and recoil implantation has offered an experimental technique for producing and investigating new magnetic systems. Of special importance are nonalloying systems, which can exhibit extreme variations of e.g. density of states and atomic volume in the probe–host combinations produced by recoil implantation. Recent developments in this field include the following: Magnetism and the Kondo effect observed for 43Sc ions in alkali metal hosts are found to be consistent with a nearly localised, ionic 3d1 single-electron configuration, and parallel the behaviour observed in certain Ce systems. More generally, essential features of the magnetism of 3d and 4d ions in sp metal hosts are similar to those of 4f systems. Recent experimental and theoretical studies of 54Fe in d-band metal hosts are of key importance for an understanding of the basic features of local moment formation on substitutional Fe ions in transition metal hosts in general. In many nonalloying 54Fe probe-host combinations, (at least) two different magnetic responses have been detected. These components correspond to substitutional and interstitial sites of the implanted probes, as has been verified by in-beam Mössbauer spectroscopy of 57Fe in a series of host metals. This provides new insight into lattice site occupation as a function of host properties and allows directed investigations of the magnetic behaviour of Fe (and Mo) ions on interstitial lattice sites. Depending on the host metal, interstitial Fe is found to be nonmagnetic, e.g. in Zr, or magnetic, e.g. in Yb. Surprisingly, even the 4d ion Mo can be magnetic on interstitial sites. The experimental results for the substitutional as well as the interstitial sites can be compared to extensive theoretical work within the framework of local spin density calculations.

Design and synthesis of fluorescence-based siderophore sensor molecules for FeIII ion determination

2010 ◽  
Vol 82 (11) ◽  
pp. 2199-2216 ◽  
Author(s):  
Bao-Lian Su ◽  
Nicolas Moniotte ◽  
Noan Nivarlet ◽  
Ge Tian ◽  
Jonathan Desmet
Keyword(s):  
Transition Metal ◽  
High Selectivity ◽  
Ph Value ◽  
Response Speed ◽  
Ion Concentration ◽  
Positional Isomers ◽  
Fluorescent Signal ◽  
Design And Synthesis ◽  
Sensor Molecules ◽  
Fe Ions

The design principles of fluorescence-based siderophore sensor molecules for detection of heavy transition-metal (HTM) ions are first reviewed. As an example, fluorescein-desferrioxamine (FlDFO), a highly efficient fluorophore molecule combining a specific Fe ion receptor and a fluorescence-sensitive signalling site has been designed, synthesized, and used for dosing with Fe ions. Its response test shows its high selectivity and sensitivity to FeIII ions and its potential for nanobiosensor design. This work clearly identified that among two FlDFO positional isomers differing by the attachment of DFO at the 5- or 6-position of the bottom benzene ring of Fl, the fluorescence of 6-FlDFO is insensitive to the complexation with Fe ions. This is independent of the linkage used between Fl and DFO. Only 5-FlDFO could be a highly potential sensor molecule since it has been revealed that in a free state without complexation with Fe ions, this fluoroionophore sensor molecule gave a maximum fluorescent signal. With successive Fe ion complexing, the fluorescence of 5-FlDFO decreased very sensitively and proportionally with ion concentration. The response speed has been evaluated as a function of Fe ion concentration. Responses to other metal ions present in the solution, such as Cu2+, Ca2+, Ni2+, and Al3+, and the effect of pH value on the efficiency of the sensor molecules have also been investigated.

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