Oxide Ionic Transport Features in Gd-Doped La Nickelates | Sciact - CRIS-system of Boreskov Institute of Catalysis

Oxide Ionic Transport Features in Gd-Doped La Nickelates Full article

Journal

Solid State Ionics
ISSN: 0167-2738

Output data

Year: 2020, Volume: 357, Article number : 115462, Pages count : 8 DOI: 10.1016/j.ssi.2020.115462

Tags

Ruddlesden – Popper phases; Oxygen isotope exchange; Mass relaxation; Structure evolution; Oxygen mobility and surface reactivity; Chemical diffusion

Authors

Sadykov Vladislav A. ^1,2 , Sadovskaya Ekaterina M. ^1,2 , Filonova Elena A. ³ , Eremeev Nikita F. ¹ , Belyaev Vladimir D. ¹ , Tsvinkinberg Viktor A. ^3,4 , Pikalova Elena Yu. ^3,4

Affiliations

1	Federal Research Center Boreskov Institute of Catalysis, Akad. Lavrentieva ave. 5, 630090 Novosibirsk, Russia
2	Novosibirsk State University, Pirogova str. 2, 630090 Novosibirsk, Russia
3	Ural Federal University named after the First President of Russia B.N. Yeltsin, Mira str. 19, 620002 Yekaterinburg, Russia
4	Institute of High Temperature Electrochemistry, UB RAS, Akademicheskaya str. 20, 620137 Yekaterinburg, Russia

Funding (2)

1	Russian Science Foundation	16-13-00112
2	Russian Foundation for Basic Research	20-03-00151 (АААА-А20-120022090045-9)

In this work new RP materials of the La2-xGdxNiO4+δ series were synthesized and their structural features, oxygen stoichiometry and transport properties were studied by X-ray diffraction, TGA, mass relaxation method and oxygen isotope exchange with C18O2 in a flow reactor. According to XRD data, La2-xGdxNiO4+δ (x = 0.0; 0.2; 0.4) are single-phase samples with a tetragonal structure. Doping with Gd resulted only in the insignificant increase of the interstitial oxygen content (δ changes in the range of 0.13–0.15). A high oxygen mobility was demonstrated: at 700 °C Dchem ~ 10−5 cm2/s (mass relaxation data) and self–diffusion coefficient D* ~ 10−8 cm2/s (oxygen isotope exchange data). Such characteristics are determined by the cooperative mechanism of oxygen migration involving both regular and highly-mobile interstitial oxygen. Gd doping, however, resulted in non-uniformity of the oxygen migration routes. To describe this feature, a mathematical model has been developed including a slow exchange between neighboring oxide anions. Oxygen mobility decreases with increasing Gd content.

Sadykov V.A. , Sadovskaya E.M. , Filonova E.A. , Eremeev N.F. , Belyaev V.D. , Tsvinkinberg V.A. , Pikalova E.Y.
Oxide Ionic Transport Features in Gd-Doped La Nickelates
Solid State Ionics. 2020. V.357. 115462 :1-8. DOI: 10.1016/j.ssi.2020.115462 WOS Scopus РИНЦ AN OpenAlex

Submitted:	Apr 30, 2020
Accepted:	Sep 6, 2020
Published online:	Sep 23, 2020
Published print:	Dec 1, 2020

Web of science:	WOS:000591907000004
Scopus:	2-s2.0-85091250040
Elibrary:	45317719
Chemical Abstracts:	2020:1959333
OpenAlex:	W3087970755

DB	Citing
Scopus	15
Web of science	13
Elibrary	13
OpenAlex	17