Journal of Siberian Federal University. Chemistry / Study of Mobile Oxygen in Ordered/Disordered Nonstoichiometric Sr-Gd-Cobaltate by Simultaneous Thermal Analysis

Full text (.pdf)
Issue
Journal of Siberian Federal University. Chemistry. 2017 10 (3)
Authors
Vereshchagin, Sergei N.; Dudnikov, Vyacheslav A.; Solovyov, Leonid A.
Contact information
Vereshchagin, Sergei N.: Institute of Chemistry and Chemical Technology SB RAS FRC “Krasnoyarsk Science Center SB RAS” 50/24 Akademgorodok, Krasnoyarsk, 660036, Russia; ; Dudnikov, Vyacheslav A.: Kirensky Institute of Physics SB RAS 50/38 Akademgorodok, Krasnoyarsk, 660036, Russia; Solovyov, Leonid A.: Institute of Chemistry and Chemical Technology SB RAS FRC “Krasnoyarsk Science Center SB RAS” 50/24 Akademgorodok, Krasnoyarsk, 660036, Russia
Keywords
disordered perovskite; cobaltate; DSC; TG; crystal structure; mobile oxygen
Abstract

Simultaneous thermal analysis (DSC/TG/mass-spectroscopy) under variable pressure was applied to study properties of mobile oxygen in cubic disordered and tetragonal A-site ordered Sr-Gd-cobaltate (Sr/Gd=4). It was shown that A-site cation ordering results in a decrease of an enthalpy of oxygen elimination, predominant localization of created anion vacancies only at one of four unequivalent crystallographic O-sites and depletion of amount of mobile oxygen, which can be removed at a reduced pressure. The observed properties of mobile oxygen and catalytic activity in reaction of methane deep oxidation for ordered/disordered perovskite phases are discussed in connection with a local environment of O2- crystallographic sites with a different number of Gd3+ cations nearby

Pages
346-357
Paper at repository of SibFU
https://elib.sfu-kras.ru/handle/2311/68941