In Situ and ex Situ Study of Cubic La 0.5 Ba 0.5 CoO 3-δ to Double Perovskite LaBaCo 2 O 6-δ Transition and Formation of Domain Textured Phases with Fast Oxygen Exchange Capability.

Autor: Malyshkin DA; Institute of Natural Sciences and Mathematics , Ural Federal University , 620002 , Ekaterinburg , 19 Mira St. , Russia., Novikov AY; Institute of Natural Sciences and Mathematics , Ural Federal University , 620002 , Ekaterinburg , 19 Mira St. , Russia., Sereda VV; Institute of Natural Sciences and Mathematics , Ural Federal University , 620002 , Ekaterinburg , 19 Mira St. , Russia., Ivanov IL; Institute of Natural Sciences and Mathematics , Ural Federal University , 620002 , Ekaterinburg , 19 Mira St. , Russia., Tsvetkov DS; Institute of Natural Sciences and Mathematics , Ural Federal University , 620002 , Ekaterinburg , 19 Mira St. , Russia., Zuev AY; Institute of Natural Sciences and Mathematics , Ural Federal University , 620002 , Ekaterinburg , 19 Mira St. , Russia.
Jazyk: angličtina
Zdroj: Inorganic chemistry [Inorg Chem] 2018 Oct 01; Vol. 57 (19), pp. 12409-12416. Date of Electronic Publication: 2018 Sep 14.
DOI: 10.1021/acs.inorgchem.8b02167
Abstrakt: The disordered La 0.5 Ba 0.5 CoO 3-δ ↔ ordered LaBaCo 2 O 6-δ transition was studied in detail using several complementary in situ (X-ray diffraction, thermogravimetry, and coulometric titration) and ex situ (transmission electron microscopy) techniques. This transition was found to proceed through the formation of complex domain textured intermediate products. They were shown to have strong affinity to oxygen and exhibit its fast absorption from ambient atmosphere (oxygen partial pressure ( pO 2 ) 0.21 atm) at a temperature as low as 70 °C. The thermodynamic stability limits of the cubic and double perovskites were determined by coulometric titration. The stability diagram of the LaBaCo 2 O 6-δ - La 0.5 Ba 0.5 CoO 3-δ system was plotted as a result. Oxygen nonstoichiometry of the thermodynamically stable cubic perovskite La 0.5 Ba 0.5 CoO 3-δ was measured as a function of pO 2 in the temperature range between 1000 and 1100 °C using a coulometric titration technique.
Databáze: MEDLINE
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