Magnetic Properties of Two-Phase Borosilicate Glasses Containing β-Fe2O3 and Fe3O4 Nanoparticles

The magnetic properties of two-phase borosilicate glasses containing in the skeleton a mixture of β-Fe2O3 and Fe3O4 nanoparticles have been studied. The sizes of nanoparticles have been determined, the value of blocking temperature (TB ~ 330 K) for ensemble of superparamagnetic nanoparticles is obtained. It is shown that in the high applied magnetic fields the specific magnetization of these glasses increases sharply at approaching and below Neel temperature for the bulk β-Fe2O3.

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Morphology and Magnetic Properties of Ferriferous Two-Phase Sodium Borosilicate Glasses

The Scientific World JOURNAL ◽

10.1155/2014/320451 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 6

Author(s):

Alexander Naberezhnov ◽

Nadezda Porechnaya ◽

Viktor Nizhankovskii ◽

Alexey Filimonov ◽

Bernard Nacke

Keyword(s):

Magnetic Properties ◽

Iron Oxides ◽

Channel Structure ◽

Borosilicate Glasses ◽

Melt Quenching ◽

Two Phase ◽

Furnace Charge ◽

Self Assembling ◽

Quenching Method ◽

Drop Structure

This contribution is devoted to the study of morphology and magnetic properties of sodium borosilicate glasses with different concentrations (15, 20, and 25 wt.%) ofα-Fe2O3in an initial furnace charge. These glasses were prepared by a melt-quenching method. For all glasses a coexistence of drop-like and two-phase interpenetrative structures is observed. The most part of a drop structure is formed by self-assembling iron oxides particles. All types of glasses demonstrate the magnetic properties and can be used for preparation of porous magnetic matrices with nanometer through dendrite channel structure.

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SEM and AFM Studies of Two-Phase Magnetic Alkali Borosilicate Glasses

The Scientific World JOURNAL ◽

10.1155/2017/9078152 ◽

2017 ◽

Vol 2017 ◽

pp. 1-9

Author(s):

N. Andreeva ◽

M. Tomkovich ◽

A. Naberezhnov ◽

B. Nacke ◽

A. Filimonov ◽

...

Keyword(s):

Magnetic Properties ◽

Necessary Condition ◽

Borosilicate Glasses ◽

Two Phase ◽

Force Microscopy ◽

Treatment Processes ◽

Atomic Force ◽

First Results ◽

Magnetic Glasses ◽

Alkali Borosilicate Glasses

The morphology and composition of four types of two-phase alkali borosilicate glasses with magnetic atoms prepared by inductive melting have been studied. The results of scanning electron microscopy point to uniform distribution of Na, Si, and O atoms in these samples while magnetic iron atoms form ball-shaped agglomerates. The magnetic properties of these agglomerates have been confirmed by magnetic force microscopy. Atomic force microscopy had shown that in these samples two different morphological structures, drop-like and dendrite net, are formed. The formation of dendrite-like structure is a necessary condition for production of porous magnetic glasses. The obtained results allow us to optimize the melting and heat treatment processes leading to production of porous alkali borosilicate glasses with magnetic properties. The first results for nanocomposite materials on the basis of magnetic glasses containing the embedded ferroelectrics KH2PO4 demonstrate the effect of applied magnetic field on the ferroelectric phase transition.

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