Thermal Processing Parametres Effect on TiO2

Cylindrical TiO2 (anatase) specimens were formed using dry extrusion technology. Thermal treatment was carried out in two stages: sintering in air at temperatures above 1273.15 K (anatase phase changes to rutile) and annealing in high-vacuum conditions at 1548.15 K (generation of oxygen vacancies). There is no waste technology was used: all waste materials generated during processing were used as row materials. There are high values of thermopower were obtained: (97÷150)×10-6 V/K what is typically for semiconductor materials and relatively low values of activation energy 0.024÷0.050 eV were calculated. It was found that thermal processing has affect on grain size in specimen by using SEM in turn grain sizes affect electrical properties