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Multivoltaic GaSe>SmCl3> clathrate as new hybrid functional nanostructure

Fedir Ivashchyshyn Anna Pidluzhna Dariusz Calus Orest Hryhorchak Piotr Chabecki Oleksandr Makarchuk
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 2 | e136726 | DOI: 10.24425/bpasts.2021.136726
Keywords impedance analysis GaSe multiferroic thermogalvanic effect negative capacity
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Abstract

The electrical properties and behaviour in constant magnetic field of fourfold expanded GaSe matrix intercalated with SmCl 3 guest were investigated by means of impedance spectroscopy and cyclic voltammetry. It was determined that the synthesized GaSe< SmCl 3> clathrate of 4-fold expansion demonstrates the coexistence of mechanisms of generation, transformation and accumulation of electric energy on a quantum level. These mechanisms are driven from external sources of magnetic, thermal and electric field without Faradaic reactions. Therefore, investigated GaSe< SmCl 3> structure is of great attraction in multivoltaics as a prototype of new class of materials. Quantum mechanical model of electro motive force of spin nature is proposed. The main focus of work lies in the prospects of synthesized clathrates for the development of power nanosources and gyrator-free delay nanolines controlled by means of magnetic field.
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Authors and Affiliations

Fedir Ivashchyshyn
1 2
ORCID: ORCID
Anna Pidluzhna
2
ORCID: ORCID
Dariusz Calus
1
ORCID: ORCID
Orest Hryhorchak
3
ORCID: ORCID
Piotr Chabecki
1
ORCID: ORCID
Oleksandr Makarchuk
1 2
ORCID: ORCID
  1. Czestochowa University of Technology, Al. Armii Krajowej 17, 42-200 Czestochowa, Poland
  2. Lviv Polytechnic National University, Bandera 12, Lviv, 79013, Ukraine
  3. Ivan Franko Lviv National University, Cyril and Methodius 8, Lviv, 79005, Ukraine

Electrophysical Properties of the Multiferroic BFN-Ferrite Composites Obtained by Spark Plasma Sintering and Classical Technology

D. Bochenek P. Niemiec D. Brzezińska
Archives of Metallurgy and Materials | 2020 | vol. 65 | No 2 | 799-804 | DOI: 10.24425/amm.2020.132823
Keywords Multiferroic composites BFN ceramics Spark Plasma Sintering (SPS)
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Abstract

In the paper the multiferroic (ferroelectric-ferromagnetic) composites based on ferroelectromagnetic/ferroelectric (BaFe1/2Nb1/2O3 (BFN)) powder and ferrite powder (zinc-nickel ferrite) were obtained by two technological methods. In the composite samples the ratio of the ferroelectromagnetic/ferroelectric powder to the magnetic powder was equal to 90:10. The ceramic powders were synthesized by the classical technological method using powder calcination/solid state synthesis, while densification of the composite powders (sintering) was carried by two different methods: (i) Free Sintering method (FS), and (ii) Spark Plasma Sintering (SPS).

At the work, a comparison of measurement results for composite samples obtained by two sintering methods was made. The studies included the following analysis: DTA, XRD, SEM, DC electrical conductivity, electric permittivity and magnetic properties. The result of measurements presented in the work revealed that the ceramic composite obtained by two different technological sintering method (classical technology – Free Sintering method and Spark Plasma Sintering technique) can be promising lead-free materials for functional applications, for example in sensors for magnetic and electric field.

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Authors and Affiliations

D. Bochenek
P. Niemiec
D. Brzezińska

Correlation Between Structure, Microstructure and Dielectric Properties of Bi7Fe3Ti3O21 Ceramics Obtained in Different Conditions

D. Szalbot J.A. Bartkowska K. Feliksik M. Bara M. Chrunik M. Adamczyk-Habrajska
Archives of Metallurgy and Materials | 2020 | vol. 65 | No 2 | 879-884 | DOI: 10.24425/amm.2020.132834
Keywords multiferroic materials Aurivillius phases Bi7Fe3Ti3O21 dielectric properties
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Abstract

Multiferroic six-layer Aurivillius type Bi7Fe3Ti3O21 ceramics was obtained by conventional mixed oxides method. The final sintering process was taken in several different sintering times, which determined changes in properties of discussed ceramic material. The structure and dielectric properties of the material are reported. In order to examine the technological conditions on the crystal structure, XRD analysis was carried out. The microstructure, as well as the quantitative and qualitative analysis of the chemical composition were investigated by scanning electron microscope with an energy dispersion spectrometer. The main purpose of the paper is to present the effect of sintering time on the microstructure, crystallographic structure and dielectric properties of Bi7Fe3Ti3O21 ceramics.

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Authors and Affiliations

D. Szalbot
ORCID: ORCID
J.A. Bartkowska
K. Feliksik
M. Bara
M. Chrunik
M. Adamczyk-Habrajska
ORCID: ORCID

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