Physical Properties of Encapsulated Iron Oxide

The size effect of magnetic nanoparticles provides a various magnetic characteristic as a change of domain size. We report, synthesis of core-shell iron oxide and magnetic properties. Iron oxide particles were synthesized by co-precipitation method of iron (III) FeCl3.6H2O, iron (II) FeCl2.4H2O, in the mixture of with or without TEOS to investigated the physical properties. From XRD measurement, it was observed that all iron oxide particles with or without mixture of SiO2 has a hematite phase of a-Fe2O3. From M-H loop measurement, it was observed that the iron oxide without SiO2 has a ferromagnetic characteristic, while the iron oxide with SiO2 showed a medium state as a contribution of superparamagnetic and ferromagnetic properties.

Fabrication and Characterization of Ni-CNT Composites by Electrical Explosion of Wire in Different Liquids

In this study, Ni-CNT powders and colloids were synthesized via the Electrical explosion of wire (EEW) in different liquid conditions. The influence of ambient solvents (D.I. Water, ethanol, methanol, acetone and ethylene-glycol) on characteristics of the as-synthesized Ni-CNT was investigated. The morphology and size were observed by field emission scanning electron microscopy (FE-SEM). The Ni particles were spherical or near spherical shape. The phase of the composite powders analyzed via X-ray diffraction demonstrate the presence of CNTs in composite powders is not affect the structure of Ni. However, the phase of the composites was changed based on the changing of liquid conditions. Stability of colloids was investigated by Turbiscan technique. Magnetic properties were also investigated by Vibrating sample magnetometer (VSM) at room temperature. The as-synthesized composite powders revealed a ferromagnetic characteristic material.

THERMAL AND MAGNETIC RESPONSE OF DIVALENT Sr DOPED HEXAGONAL YMnO3

Strontium doped polycrystalline YMnO 3 multiferroic ceramics prepared by using conventional solid state reaction method are examined for their structural, thermodynamic and magnetic properties. The observed pointed kinks in the specific heat study are indicative of the probable coupling between the electric and magnetic orders in this class of materials. The reported systematic specific heat studies show that the antiferromagnetic (AFM) transition temperature (TN) shifts to higher value with increasing concentration of Sr 2+ ion in the YMnO 3. The reported compounds show the independence of specific heat behavior and magnetic transition temperature with applied magnetic field of 8 T and 12 T. Our systemic magnetization studies of " Sr " doped YMnO 3 compounds indicated a weak ferromagnetic characteristic in the temperature lower than the AFM transition temperature.