Siberian Federal University 
- Issue
- Journal of Siberian Federal University. Chemistry. 2016 9 (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 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
- perovskite; order-disorder; phase transition; DSC
- Abstract
Process of interconversion of tetragonal Sr(0.8)Gd(0.2)CoO(3-d) (with ordered Sr/Gd cations and anion vacancies) to cubic one (with disordered structure) was studied by X-ray structural and thermal analysis at 1100-1473 K. It was shown that the transformation is a first order diffuse phase transition. The ramp rate does not affect cation and anion vacancies disordering which is controlled by thermodynamic parameters of the processes in the solid whereas cubic to tetragonal transition is kinetically controlled. A theory of diffuse phase transition was applied to quantitatively analyze heat capacity temperature dependence
- Pages
- 326-336
- Paper at repository of SibFU
- https://elib.sfu-kras.ru/handle/2311/30718
Journal of Siberian Federal University. Chemistry / DSC+TG and XRD Study of Order-Disorder Transition in Nonstoichiometric Sr-Gd-Cobaltate
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