Investigation of  the frequency dispersion of  the complex permittivity  of lithium-iron spinel doped with La,Y

A.V. Vakalyuk; V.M. Vakalyuk; H.V. Voitkiv; I.M. Gasiuk

doi:10.15330/pcss.25.3.492-497

Authors

A.V. Vakalyuk Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
V.M. Vakalyuk Ivano Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine
H.V. Voitkiv Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
I.M. Gasiuk Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine

DOI:

https://doi.org/10.15330/pcss.25.3.492-497

Keywords:

impedance spectroscopy, spinel, fractal structure, frequency dispersion of dielectric permittivity, dielectric susceptibility, dielectric loss angle, hopping mechanism of conduction

Abstract

The temperature-frequency dependences of the complex dielectric permittivity of Li₂Fe_2.5-xMe_xO₄(Ме = La; Y, x = 0.01; 0.03; 0.05) spinels, synthesized by the «sol-gel» autocombustion technology, were obtained by the method of impedance spectroscopy, in temperature range 298-473K. Their analysis indicates the presence of a fractal structure in the studied samples, the influence of which is manifested in the entire studied temperature interval. To study the electric polarization phenomenon associated with this structure, Josher's generalized law has been used.

References

I.M. Gasyuk, I.M. Budzulyak, S.A. Galiguzova, V.V. Uhorchuk, L.S. Kaikan, Cathode materials of lithium current sources based on Li0,5Fe2,5O4, Nanosystems, Nanomaterials, Nanotechnologies, 4(3), 613 (2006).

H.M. Widatallah, C. Jonson, F.J. Berry, E.A. Moore, E. Jartych, Synthesis, structural andтьmagnetic characterization of aluminium-substituted Li0,5Fe2,5O4 spinel lithium ferrite, United Nations Educational Scientific and Cultural Organization and International Atonomic Energy Agency. IC., 159 (2002).

E.Wolska, J.Darul, W.Nowicki, P.Piszora, C.Baehtz, M.Knapp, Order-disorder phase transition in the spinel lithium ferrite, HASYLAB Jahresbericht, 317 (2004).

E. Wolska, J. Darul, W. Nowicki, P. Piszora, C. Baehtz, M. Knapp, High temperature X-ray powder diffraction studies on the LiFe5O8-LiAl5O8 spinel solid solutions, HASYLAB Jahresbericht, 357 (2005).

B.K. Ostafychuk, I.M. Gasiuk, B.Ya. Deputat, I.P. Yaremiy, L.S. Kaikan, T.V. Grabko, X-ray structural studies of lithium-iron spinel Li0,5Fe 2,5O4 doped with aluminum ions, Physics and Chemistry of Solid State, 9(1), 24 (2008).

B.Ya. Deputat, Temperature dependence of the conductivity of Li2O-Fe2O3-Al2O3 ceramics on the aluminum content, Physics and Chemistry of Solid State, 15(1), 186 (2014).

I.M. Gasyuk, A.V. Vakalyuk, V.M. Vakalyuk. Thermal dependency of Li+-ion conductivity in Li2O-Fe2O3-Al2O3 ceramics, Materials Today: Proceedings, 35(4), 567 (2021); https://doi.org/10.1016/j.matpr.2019.10.103.

A.V. Vakalyuk, V.M. Vakalyuk, M.I. Hasiuk, I.M. Hasiuk Mechanisms of electrical polarization of disordered systems based on Al-substituted LiFe-oxospinel, Physics and Chemistry of Solid State, 22(2), 336 (2021); https://doi.org/10.15330/pcss.22.2.336-340.

M. N. Akhtar, M.A. Khan, Effect of rare earth doping on the structuraland magnetic features of nanocrystalline spinel ferrites prepared via sol gel route, Journal of Magnetism and Magnetic Materials (2018),doi: https://doi.org/10.1016/j.jmmm.2018.03.069.

M. Yousaf, M.N. Akhtar, B. Wang, A. Noor, Preparations, optical, structural,conductive and magnetic evaluations of RE's (Pr, Y, Gd, Ho, Yb) doped spinel nanoferrites, Ceramics International (2019), doi: https://doi.org/10.1016/j.ceramint.2019.10.149.

Majid Niaz Akhtar, Muhammad Yousaf , Yuzheng Lu, Muhammad Azhar Khan, Ali Sarosh, Mina Arshad, Misbah Niamat, Muhammad Farhan, Ayyaz Ahmad, Muhammad Umar Khallidoon, Physical, structural, conductive and magneto-optical properties of rare earths (Yb, Gd) doped Ni–Zn spinel nanoferrites for data and energy storage devices, Ceramics International 47, 11878 (2021); https://doi.org/10.1016/j.ceramint.2021.01.028.

A.V. Vakalyuk, I.M. Gasiuk, V.M. Vakalyuk, The temperature dependence investigation of the frequency dispersion of the electrical properties of lithium-iron spinel doped with La, Y, Physics and Chemistry of Solid State, 25(1), 148 (2024); https://doi.org/10.15330/pcss.25.1.148-156.

I.I. Popov, R.R. Nigmatullin, A.A. Khamzin, and I.V. Lounev, Conductivity in disodered structure:Verification of the generelized Jonscher’s law experimental data, Journal of Applied Physics 112, 094107 (2012); https://doi.org/10.1063/1.4764343.

M. Abdullah Dar, Khalid Mujasam Batoo, Vivek Verma, W.A. Siddiqui, R.K. Kotnala, Synthesis and characterization of nano-sized pure and Al-doped lithium ferrite having high value of dielectric constant, J. Alloys and Compounds 493, 553 (2010); https://doi.org/10.1016/j.jallcom.2009.12.154.