Structural, optical and magnetic studies of CuFe2O4, MgFe2O4 and ZnFe2O4 nanoparticles prepared by hydrothermal/solvothermal method

AbstractThe monodisperse Ni0.5Zn0.5Fe2O4 nanospheres have been synthesized via a simple solvothermal method. The effects of reactant concentration on structural and magnetic properties have been studied. X-ray diffraction analysis results indicate that the lattice constant and crystallite size can be tuned by controlling reactant concentration. The nanosphere size monotonically decreases from 238 to 35 nm with increasing reactant concentration. The magnetic studies show that blocking temperature is enhanced, and these single-domain particles are superparamagnetism at room temperature. The hollow nanospheres exhibit a high saturation magnetization value of 52.6 emu/g. The nanospheres with various diameters exhibit different magnetic saturation values which may be caused by the domain structure, surface effects and the distribution of metal ions on A and B sites. These superparamagnetic Ni0.5Zn0.5Fe2O4 nanospheres are expected to have potential application in biomedicine and magnetic fluid technology.

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MAGNETIC STUDIES OF Clb-COMPOUNDS OF TRANSITION METALS

Le Journal de Physique Colloques ◽

10.1051/jphyscol:1971120 ◽

1971 ◽

Vol 32 (C1) ◽

pp. C1-74-C1-75 ◽

Cited By ~ 1

Author(s):

K. ENDO ◽

Y. FUJITA ◽

R. KIMURA ◽

T. OHOYAMA ◽

M. TERADA

Keyword(s):

Transition Metals ◽

Magnetic Studies

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MAGNETIC STUDIES OF FeNdB COMPOSITIONALLY MODULATED THIN FILMS

Le Journal de Physique Colloques ◽

10.1051/jphyscol:19888825 ◽

1988 ◽

Vol 49 (C8) ◽

pp. C8-1807-C8-1808

Author(s):

B. Martinez ◽

M. A. Moreu ◽

J. Tejada

Keyword(s):

Thin Films ◽

Magnetic Studies

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Synthesis, Spectral and Antimicrobial Investigation of 2-(Naphthalenel-ylamino)-2- Phenylacetonitrile and 1, 10-Phenanthroline with Five Divalent Transition Metal Ions

International Journal of Pharmaceutical Quality Assurance ◽

10.25258/ijpqa.10.1.6 ◽

2019 ◽

Vol 10 (01) ◽

Author(s):

Mohammed Al-Amery1 ◽

Ashraf Saad Rasheed ◽

Dina A. Najeeb

Keyword(s):

Transition Metal ◽

Metal Ions ◽

Transition Metal Ions ◽

Molar Conductance ◽

Octahedral Geometry ◽

Mixed Ligand ◽

Gram Negative Bacteria ◽

Magnetic Studies ◽

Gram Positive Bacteria

Five new mixed ligand metal complexes have been synthesized by the reaction of divalent transition metal ions (Hg, Ni, Zn, Cu and Cd) with 2-(naphthalen-l-ylamino)-2-phenylacetonitrile (L1 ) and 1,10-phenanthroline (L2). The coordination likelihood of the two ligands toward metal ions has been suggested in the light of elemental analysis, UV-Vis spectra, FTIR, 1H-NMR, flam atomic absorption, molar conductance and magnetic studies. Results data suggest that the octahedral geometry for all the prepared complexes. Antibacterial examination of synthesized complexes in vitro was performed against four bacterias. Firstly, Gram-negative bacteria namely, Pseudomonas aerugin and Escherichia. Secondly, Gram-positive bacteria namely, Bacillus subtilis, Staphylococcuaurouss. Results data exhibit that the synthesized complexes exhibited more biological activity than tetracycline pharmaceutical.

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Exchange-Biasing in a Dinuclear Dysprosium(III) Single-Molecule Magnet with a Large Energy Barrier for Magnetization Reversal

10.26434/chemrxiv.10260494 ◽

2019 ◽

Author(s):

Tian Han ◽

Marcus J. Giansiracusa ◽

Zi-Han Li ◽

You-Song Ding ◽

Nicholas F. Chilton ◽

...

Keyword(s):

Single Molecule ◽

Magnetization Reversal ◽

Energy Barrier ◽

Magnetic Hysteresis ◽

Large Energy ◽

Magnetic Studies ◽

Bridging Ligands ◽

Single Molecule Magnet ◽

Exchange Biasing

A dichlorido-bridged dinuclear dysprosium(III) single-molecule magnet [Dy2L2(µ-Cl)2(THF)2] has been made using a diamine-bis(phenolate) ligand, H2L. Magnetic studies show an energy barrier for magnetization reversal (Ueff) around 1000 K. Exchange-biasing effect is clearly seen in magnetic hysteresis with steps up to 4 K. Ab initio calculations exclude the possibility of pure dipolar origin of this effect leading to the conclusion that super-exchange via the chloride bridging ligands is important.

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