Siberian Federal University 
- Issue
- Journal of Siberian Federal University. Chemistry. 2018 11 (4)
- Authors
- Vereshchagin, Sergey N.; Dudnikov, Vyacheslav A.; Orlov, Yury S.
- Contact information
- Vereshchagin, Sergey N.: Institute of Chemistry and Chemical Technology SB RAS FRC “Krasnoyarsk Scientific Center of the SB RAS” 50/24 Akademgorodok, Krasnoyarsk, 660036, Russia; ; Dudnikov, Vyacheslav A.: Kirensky Institute of Physics FRC “Krasnoyarsk Scientific Center of the SB RAS” 50/38 Akademgorodok, Krasnoyarsk, 660036, Russia; Orlov, Yury S.: Kirensky Institute of Physics FRC “Krasnoyarsk Scientific Center of the SB RAS” 50/38 Akademgorodok, Krasnoyarsk, 660036, Russia
- Keywords
- perovskite; order-disorder; phase transition; TG; DSC
- Abstract
For the first time a method of TG/DSC analysis under constant and variable gas phase composition was applied to reveal interconnection between quenching ramp rates and degree of phase transformation of cubic nonstoichiometric disordered perovskite (I) Sr(0.8)Dy(0.2)CoO(3-d) to tetragonal structure (II) with ordered Sr/Dy cations and anion vacancies. It was shown that the transformation is a first order phase transition and the ordering process is kinetically controlled. Based on the experimental transition enthalpy it was found that a formal conversion degree of I to II was 98-30% under cooling ramp rates 3-99 K/min. Non-linear relationship between the completeness of I-to-II transformation and mobile oxygen characteristics (content and the enthalpy of O-removal) was demonstrated
- Pages
- 507-517
- Paper at repository of SibFU
- https://elib.sfu-kras.ru/handle/2311/109213
Journal of Siberian Federal University. Chemistry / Application of TG/DSC Analysis under Variable Gas Phase Composition to Study Order-Disorder Transition in Nonstoichiometric Sr-Dy-Cobaltate
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