Oxygen Diffusion in Mg-Doped Sm and Gd Zirconates with Pyrochlore Structure | Sciact - CRIS-system of Boreskov Institute of Catalysis

Oxygen Diffusion in Mg-Doped Sm and Gd Zirconates with Pyrochlore Structure Full article

Journal

Ionics
ISSN: 0947-7047 , E-ISSN: 1862-0760

Output data

Year: 2020, Volume: 26, Number: 9, Pages: 4621-4633 Pages count : 13 DOI: 10.1007/s11581-020-03614-5

Tags

2D diffusion; Diffusion; Isotope exchange of oxygen; Modeling; O conductors; Pyrochlores

Authors

Sadykov Vladislav ^1,2 , Shlyakhtina Anna ³ , Lyskov Nikolai ⁴ , Sadovskaya Ekaterina ^1,2 , Cherepanova Svetlana ^1,2 , Eremeev Nikita ¹ , Skazka Valery ^2,5 , Goncharov Vladimir ¹ , Kharitonova Elena ⁶

Affiliations

1	SB RAS, Federal Research Center Boreskov Institute of Catalysis, Akad. Lavrentieva ave. 5, Novosibirsk 630090, Russia
2	Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia
3	RAS, N.N. Semenov Federal Research Center for Chemical Physics, Moscow, Russia
4	RAS, Institute of Problems of Chemical Physics, Acad. Semenov ave. 1, Chernogolovka 142432, Russia
5	SB RAS, Sobolev Institute of Mathematics, Acad. Koptyug ave. 4, Novosibirsk 630090, Russia
6	Lomonosov Moscow State University, Leninskiye Gory str. 1/2, Moscow 119991, Russia

Funding (3)

1	Federal Agency for Scientific Organizations	0303-2016-0013
2	Russian Science Foundation	16-13-00112
3	Ministry of Science and Higher Education of the Russian Federation	426 (АААА-А20-120013190076-0)

Oxides with pyrochlore structure are promising materials for SOFCs, oxygen and hydrogen separation membranes, and other devices. Ln zirconates attract interest due to their oxygen and protonic mobility. In this work, oxygen transport mechanism in Mg-doped Sm and Gd zirconates was studied. Sm1.9Mg0.1Zr2O6.95 and Gd1.9Mg0.1Zr2O6.95 oxides have been prepared via the mechanical activation and characterized by XRD, TGA, and SEM. Oxygen transport features were studied by the oxygen isotope exchange with C18O2. Isotope substitution of bulk oxygen was demonstrated to be described by the 2D diffusion model. Very fast diffusion within grain boundaries provides fast isotope label distribution over the oxide domains, then tracer distributes due to a slower diffusion within domains’ bulk. Three forms of oxygen were distinguished within grains’ bulk. Very fast diffusion along grain boundaries (Dgb ~ 10−7 cm2/s at 700 °C) can provide high rates of oxygen transport in oxygen separation membranes.

Sadykov V. , Shlyakhtina A. , Lyskov N. , Sadovskaya E. , Cherepanova S. , Eremeev N. , Skazka V. , Goncharov V. , Kharitonova E.
Oxygen Diffusion in Mg-Doped Sm and Gd Zirconates with Pyrochlore Structure
Ionics. 2020. V.26. N9. P.4621-4633. DOI: 10.1007/s11581-020-03614-5 WOS Scopus РИНЦ AN OpenAlex

Submitted:	Jun 19, 2019
Accepted:	May 8, 2020
Published online:	May 26, 2020
Published print:	Sep 1, 2020

Web of science:	WOS:000535381000002
Scopus:	2-s2.0-85085383761
Elibrary:	45465432
Chemical Abstracts:	2020:1003074
OpenAlex:	W3029442237

DB	Citing
Scopus	21
Web of science	21
Elibrary	23
OpenAlex	24