проводимость

Cite measuring result spectrum impedance of polycrystalline samples Mg-replace lithium-iron spinel structure Lig 5Fe) 4М2 1 Ол in the frequency range 10-2—105 Hz in temperature range 295—723K. Displayed, that conduct temperature dependence real part of dielectric conductivity from temperature affirm about process activation electron transition between ions of iron varied valence and accompany reorientation dipole in variable field. At high temperatures (7 >573K) make apparent dominating contribution of electro conductivity on direct current.

Properties of Dye Solar Cells with quasi solid electrolytes based on PEG have been investigated. The attempts to enhance the electrolyte conductivity was made with Li electrolyte introduction. 

The new composite material on the basis of polytitanates of potassium and the ionic conductor of iodide of silver with extremely high dielectric permeability is synthesized. Impedance and dielectric characteristics of the received material are investigated.

The electrochemical properties of a ceramic composite material in which a hollandite-like potassiumchromium titanate solid solution is presented as the main phase were studied using impedance spectroscopy. The dependences of the conductivity of the obtained composites on temperature in the range from 250 to 800°C were studied. The activation energies of volumetric, intergranular and grain volume conductivity were determined. The phase composition of the material and the crystallographic structures of individual phases were also established. 

The electrochemical and electrophysical properties of basic and protonated potassium titanates in contact with the graphite electrodes were studied using the method of impedance spectroscopy. The characteristics of potassium titanates are given depending on the methods of modification and on the methods of their processing. The activation energies for some compositions were determined.

The new materials obtained in the potassium polytitanate (PPT)–MnSO₄ system by modifying PPT in aqueous solutions of manganese sulfate of various concentrations, followed by thermal treatment and annealing at 1080°C, were synthesized and studied. The phase composition of the obtained materials was determined. Their electrochemical and electrophysical properties in the temperature range from 250 to 700°C were studied.

The electrochemical and electrophysical properties of the protonated and modified with silver iodide potassium titanates, which can be applied in energy storage units, have been investigated by impedance spectroscopy. It has been shown that the dielectric losses at medium and high frequencies are weakly dependent on the polarizing voltage. It has also been established that transfer in modified potassium titanate can be made through potassium and silver ions.

The temperature dependence of conductivity, enthalpy and 7Li spin-lattice relaxation time for Li₅TiN₃ and Li₅SiN₃, have been measured at temperature range of 300 – 850 K. The migration and formation energy of lithium defects have been estimated. Also the conductivity of Li₉TiN₃O₂, Li₉SiN₃O₂ have been measured and the activation energies of the conduction have been obtained.

The solid lithium electrolytes in the system Li4-3xGaxGeO4 were synthesized and studied. The introduction of Ga3+ ions into lithium orthogermanate leads to the formation of γ-Li3PO4 type structure and sharp increasing of conductivity which have the maximum at x = 0.10÷0.15 and reach ~ 10-1 S·cm-1 at 300°C, > 1 S·cm-1 at 600°C. The main current carriers are interstitial lithium cations which have the weak connection with rigid skeleton of structure. Results are compared with the earlier obtained date on the similar aluminum containing system.

The influence of the pH value in the dispersions during washing the potassium polytitanate powder (PPT) after its molten salt synthesis on electrical properties of the obtained product, namely conductivity, permittivity and tangent of dielectric losses. It is established that the samples obtained in weakly alkaline conditions (pH = 7.44 and 8.50), are characterized by higher values of low-frequency conductivity and dielectric permittivity (up to 10^{5), low value of the relaxation time (0.112 and 0.358, respectively).