Synthesis by the Method of Pyrolysis and Electrophysical Properties of Ceramics Based on the K₂O–TiO₂–Al₂O₃ System

Abstract—Using the pyrolysis of citrate-nitrate compositions, ceramic materials are synthesized in the titanium-rich region of the K₂O–TiO₂–Al₂O₃ system. The resulting materials are compositions with different phase contents: K₂Ti₆O₁₃, hollandite K_xAl_xTi_{8 – x}O₁₆, and titanium oxide with a rutile structure. The results of a study of their electrically conductive properties in a wide temperature range are presented. The highest conductivity (σ = 1.2 × 10^–3 S/cm at 750°C) is exhibited by single-phase potassium hexatitanate. The activation energy for this sample in the range 450–750°С is 0.75 eV.