Details

Autor(en) / Beteiligte

• Rodenbücher, Christian
• Meuffels, Paul
• Speier, Wolfgang
• Ermrich, Martin
• Wrana, Dominik
• Krok, Franciszek
• Szot, Kristof

Titel

Stability and Decomposition of Perovskite-Type Titanates upon High-Temperature Reduction (Phys. Status Solidi RRL 9/2017)

Ist Teil von

• Physica status solidi. PSS-RRL. Rapid research letters, 2017-09, Vol.11 (9), p.1770345

Ort / Verlag

Weinheim: Wiley Subscription Services, Inc

Erscheinungsjahr

2017

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Perovskite-type oxides such as strontium titanate (SrTiO3) are the key materials for future energy-efficient information and energy technology due to their extraordinary properties. A frequently employed method to tailor those properties is thermal reduction under vacuum conditions whereupon the oxide gains metallic properties due to the release of oxygen. The question now arises: What else could happen in course of thermal reduction? In order to investigate this question, Rodenbucher et al. (article no. 1700222) have performed thermal annealing experiments under different conditions. It is shown that under standard vacuum conditions the oxide is macroscopically stable and changes its electronic properties without a significant structural transformation. However, as soon as a material with high oxygen affinity such as Ti acting as oxygen getter is placed in the vicinity of the oxide during vacuum annealing, an evaporation of Sr sets in and a porous surface layer consisting of titanium suboxides in nanocrystalline form evolves. This surprising behaviour can be understood as an incongruent sublimation of the alkaline earth metal (here Sr) taking place at extremely low oxygen partial pressures.