CLATHRATE SEMICONDUCTOR MULTIFERROICS, SYNTHESIZED IN SYSTEM GаSE-NаNO2-FеSO4 AND INFLUENCE OF COINTERCALATION

I. I. Grygorchak, F. O. Ivashchyshyn, A. K. Borysiuk, R. Ya. Shvets, Yu. O. Kulyk

Abstract


Context. The task for electric energy accumulation in non-electrochemical way but by means of electrons and spins was developed on the basis of quantum accumulators and spin capacitors. Synthesized clathrates of 4 folds expanded GaSe matrix with guest component sodium nitrite NaNO2, Iron II Sulfate FeSO4 and combination of them NaNO2⊕FeSO4 are the object of research.

Objective. Synthesis of heterostructured nanocomposite materials with large developed interface, anisotropic electric conductance and high values of dielectric permittivity in combination with loss tangent less than 1.

Method. The intercalation approach to heterostructured nanocomposite materials formation was proposed. It allows creating developed atomic-molecular complexes of host-guest type and hierarchical structures of subhost-host-guest type. The X-ray diffractometry data show the structural changes in macro composite NaNO2⊕FeSO4 at the transition to the guest nanoscale geometry. With the help of frequency dependence of specific complex impedance the main features of current flow and charge accumulation processes in synthesized nanohybrids and effect of cointercalation were determined. Impedance photo- and magneto- responses show a gigantic photodielectric, magnetoresistive and magnetocapacitive effects at room temperature. These effects open up a new possibilities of theirs application as highly sensitive sensors of constant magnetic and light wave field.

Results. Clathrates GaSe<NaNO2>, GaSe<FeSO4> та GaSe<NaNO2⊕FeSO4> were synthesized. Electric charge accumulation at the interface was determined. The effects of negative photoconductivity and giant magnetoresistance, drastic increase in photo-EMF, giant photodielectric and magnetocapacitive effects were registered at room temperature.

Conclusions. Cointercalation of NaNO2⊕FeSO4 modifies the energetic specter of GaSe more than individual intercalation. Synthesized clathrates are promising materials for novel approaches in thechnology of highly sensible sensors of capacitive type for magnetic and light wave field at room temperatures as well as for quantum accumulators and quantum capacitors as a new alternative of chemical power sources


Keywords


Supramolecular ensembles; clathrates; nanohybrids; Galium Selenide; impedance spectroscopy; photodielectric effect; magnetocapacity; quantum accumulators; spin capacitors

References


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DOI: https://doi.org/10.15588/1607-3274-2017-3-1



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