Lymar D.V.1, Glazunova E.V.1,2, Shilkina L.A.1, Kulikova E.S.3, Nazarenko A.V.4, Spivakov A.A.1, Verbenko I.A.1, Khasbulatov S.V.2, Reznichenko L.A.1
1Institute of Physics, Southern Federal University, Rostov-on-Don, Russia
2Kh. Ibragimov Complex Institute of the Russian Academy of Sciences, Groznyi, Russia
3National Research Center “Kurchatov Institute”, Moscow, Russia
4Federal Research Center Southern Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia
Email: glazunova@sfedu.ru
The paper presents the results of X-ray diffraction analysis, microstructure and dielectric characteristics studies of solid solutions in the Li1-xNaxNi0.5Mn1.5O4 system. X-ray diffraction analysis showed that solid solutions in the Li1-xNaxNi0.5Mn1.5O4 system have a disordered structure of the Fd3m spinel type. The introduction of Na+ into the system leads to the formation of NiO and LiMnO2 impurity phases, the concentration of which increases with increasing Na+ concentration. It is shown that the introduction of Na+ into the system leads to a decrease in the cell parameter, which indicates its non-inclusion or limited inclusion in the LiNi0.5Mn1.5O4 crystal lattice. Analysis of the dielectric spectral dependencies showed that there is no transition to the ferroelectric phase in Li1-xNaxNi0.5Mn1.5O4 solid solutions. The increase in electrical conductivity above 150 K is due to hopping conductivity. Keywords: solid-phase synthesis, spinel-type structure, LiNi0.5Mn1.5O4, modification, dielectric spectroscopy.
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