Interaction of lithium-titanium ceramics with air during sintering

Abstract

Interaction of lithium-titanium polycrystalline ferrites with ambient air during their sintering is investigated using the methods of electroconductivity and thermal gravimetry within the temperature interval Т = 600-1300 K. It is found out that the temperatures exceeding Т = 1100 K correspond to effective course of reducing reactions in this material, which results in the formation of an oxygen-deficient ceramic structure in the stage of isothermal tempering (Т = 1280 К). It is shown that in the final cooling stage the process of exchange of the ferrite ceramics with the ambient atmosphere exhibits a pronounced oxidative character. The role of these redox processes in the formation of the oxygen non-stoichiometry of the sintered specimen and the depth of its distribution are analyzed.

The electrical conductivity of the surface layers of oxide polycrystalline semiconductors irradiated by accelerated ions

“…In sintering of ferrite, oxidation-reduction reactions actively proceed and affect the boundary properties. Due to higher diffusion permeability, GBs are actively enriched with oxygen [5]. As a result, it becomes more oxidized; this causes decrease in Fe +2 ion concentration in its vicinity, and hence, charge carrier concentration.…”

Influence of a high-power pulsed ion beam on the mechanical properties of corundum ceramics

“…There are widespread use of oxide ceramics, for example, lithium-ferrite ceramics [1][2][3], zirconium ceramics [4][5][6][7] and corundum ceramics [8][9][10]. When manufacturing of ceramics for functional and instrumental purposes, both traditional and nontraditional methods of processing finished ceramics are used.…”