Electrical properties and defect chemistry of anatase (TiO2)

Alicia Weibel (1) , Renaud Bouchet (1) , Philippe Knauth (1)

1 MADIREL - Matériaux divisés, interfaces, réactivité, électrochimie

The electrical properties of pure Anatase are investigated by impedance spectroscopy as function of temperature and oxygen partial pressure. The experimental results are fully interpreted by point defect chemistry. A transition from predominant Schottky to Frenkel cation disorder is observed when the temperature increases and/or the oxygen partial pressure decreases. The reduction enthalpies are near those obtained for Rutile in previous studies.

Mots clés: Ceramic; Microstructure; Point defects

Mots clés: Impedance spectroscopy

Domaines: Matériaux

Alicia Weibel, Renaud Bouchet, Philippe Knauth. Electrical properties and defect chemistry of anatase (TiO2). Solid State Ionics, 2006, 177 (3-4), 229-236 available on : http://oatao.univ-toulouse.fr/686/1/weibel_686.pdf. ⟨hal-00474858⟩