Abstract
In this contribution we present the first results devoted to studies of structure, morphology and magnetic properties of magnetic alkali-borosilicate glasses prepared by induction melting. This procedure permits to fabricate a large amount of two-phase glasses with magnetic properties due to self-assembled magnetite (Fe3O4) nanoparticles and with branched dendrite-like structure of channels formed by a chemical unstable phase. After withdrawal of this phase we have obtained the porous matrices with two different average pore diameters: ∼6 nm and ∼60 nm. The empty pore spaces in these matrices were filled by ferroelectrics KH2PO4 from water solution. It is shown that application of external magnetic fields above B=1 T results in a linear growth of the ferroelectric phase transition temperature TC on 6 K at B=10 T due to magnetostrictive properties of porous matrices.
Highlights
Mesoporous alkali borosilicate glasses with magnetic properties are very interesting materials for numerous applications because of its attractive physicochemical properties: a controllable average pore diameter, a low thermal expansion coefficient, a chemical and mechanical stability, a high specific surface area, dielectric and optic properties and so on [1,2,3,4,5]
2.1 Production and dielectric studies To obtain the porous magnetic glasses suitable for preparation multifunctional nanocomposites it is necessary to solve the following sequences of intermediate problems: 1 - optimization the initial component mixture, 2 – selection of the preferable melting process parameter, 3 - homogeneity of initial mixture stirring at melting due to convective and electromagnetic agitations, 4 – choice of liquation conditions providing a two-phase interconnected structure after liquation, 5 – developing of etching procedure for production of dendrite throughout pore system with controllable average pore size
To solve the first problem, we have used the results presented in the paper [17] and our preliminary data concerning to melting of porous magnetic glasses (PMG) [22]
Summary
Mesoporous alkali borosilicate glasses with magnetic properties are very interesting materials for numerous applications because of its attractive physicochemical properties: a controllable average pore diameter, a low thermal expansion coefficient, a chemical and mechanical stability, a high specific surface area, dielectric and optic properties and so on [1,2,3,4,5]. In this contribution we present the first results devoted to studies of structure, morphology and magnetic properties of magnetic alkali-borosilicate glasses prepared by induction melting.
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