Conductivity and Oxygen Diffusion in Bixbyites and Fluorites Ln6−xMoO12−δ (Ln = Er, Tm; x = 0, 0.5) | Sciact - CRIS-system of Boreskov Institute of Catalysis

Conductivity and Oxygen Diffusion in Bixbyites and Fluorites Ln6−xMoO12−δ (Ln = Er, Tm; x = 0, 0.5) Full article

Journal

International Journal of Hydrogen Energy
ISSN: 0360-3199 , E-ISSN: 1879-3487

Output data

Year: 2021, Volume: 46, Number: 32, Pages: 16965-16976 Pages count : 12 DOI: 10.1016/j.ijhydene.2021.02.029

Tags

Bixbyite; Fluorite; Molybdates; Oxygen mobility; Proton conductivity

Authors

Shlyakhtina A.V. ¹ , Lyskov N.V. ² , Šalkus T. ³ , Kežionis A. ³ , Patrakeev M.V. ⁴ , Leonidov I.A. ⁴ , Shcherbakova L.G. ¹ , Chernyak S.A. ⁵ , Shefer K.I. ^6,7 , Sadovskaya E.M. ^6,7 , Eremeev N.F. ⁶ , Sadykov V.A. ^6,7

Affiliations

1	Federal Research Center Semenov Institute of Chemical Physics, Russian Academy of Sciences, Kosygina st. 4, Moscow, 119991, Russia
2	Institute of Problems of Chemical Physics, Russian Academy of Sciences, Academician Semenov ave. 1, Chernogolovka 142432, Moscow Oblast, Russia
3	Institute of Applied Electrodynamics and Telecommunications, Faculty of Physics, Vilnius University, Sauletekio ave. 9/3, Vilnius LT-10222, Lithuania
4	Institute of Solid State Chemistry, Urals Branch of Russian Academy of Sciences, Pervomaiskaya str. 91, GSP, Yekaterinburg 620990, Russia
5	Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, Moscow, 119991, Russia
6	Federal Research Center Boreskov Institute of Catalysis, Siberian Branch of Russian Academy of Sciences, Akad. Lavrentieva ave. 5, Novosibirsk 630090, Russia
7	Novosibirsk State University, Pirogova str. 2, Novosibirsk 630090, Russia

Funding (6)

1	Russian Foundation for Basic Research	19-03-00358 (АААА-А19-119031290055-2)
2	Ministry of Science and Higher Education of the Russian Federation	426 (АААА-А20-120013190076-0)
3	Ministry of Science and Higher Education of the Russian Federation	0239-2021-0011
4	Russian Foundation for Basic Research	20-03-00399
5	Ministry of Science and Higher Education of the Russian Federation	075-03-2019-588 (АААА-А19-119061890019-5)
6	Ministry of Science and Higher Education of the Russian Federation	0397-2019-0002 (АААА-А19-119031890026-6)

In the present work erbium and thulium molybdates Ln5.5MoO11.25−δ (Ln = Er and Tm) with fluorite and Ln6MoO12−δ (Ln = Er and Tm) with bixbyite structure have been studied. The materials have been obtained by mechanical activation method followed by sintering at 1600°С for 3 h. New compounds have been characterized by X-ray diffraction. The total conductivity was investigated using impedance spectroscopy method in dry and wet air. Oxygen diffusivity data was acquired by oxygen isotope exchange with C18O2. The combination of different techniques allowed us to determine ionic conductivity components in these compounds. Er and Tm fluorites and bixbyites showed oxygen-ion conductivity in dry air and oxygen-ion and proton conductivity in wet air up to 550–600°С. In wet atmosphere Er and Tm fluorites and bixbyites have total conductivity of about 2∙10−6 S/cm at 500 °C. At higher temperatures they are mixed oxygen-electronic conductors in dry and wet atmosphere. At lower (T < 400 °C) temperatures bixbyites are slightly better ionic conductors compared to fluorites. A high oxygen-ion mobility in all compounds above 200°С has been confirmed by isotope exchange method with С18O2: tracer diffusion coefficient values were ~10−11 – 10−10 cm2/s at 700 °C. Fluorites were demonstrated to have a higher oxygen mobility compared to bixbyites; the effect is more pronounced for Tm molybdates. © 2021 Hydrogen Energy Publications LLC

Shlyakhtina A.V. , Lyskov N.V. , Šalkus T. , Kežionis A. , Patrakeev M.V. , Leonidov I.A. , Shcherbakova L.G. , Chernyak S.A. , Shefer K.I. , Sadovskaya E.M. , Eremeev N.F. , Sadykov V.A.
Conductivity and Oxygen Diffusion in Bixbyites and Fluorites Ln6−xMoO12−δ (Ln = Er, Tm; x = 0, 0.5)
International Journal of Hydrogen Energy. 2021. V.46. N32. P.16965-16976. DOI: 10.1016/j.ijhydene.2021.02.029 WOS Scopus РИНЦ AN OpenAlex

Submitted:	Nov 30, 2020
Accepted:	Feb 4, 2021
Published online:	Mar 4, 2021
Published print:	May 10, 2021

Web of science:	WOS:000644993100014
Scopus:	2-s2.0-85101978930
Elibrary:	46761857
Chemical Abstracts:	2021:509563
OpenAlex:	W3135196370

DB	Citing
Scopus	10
Web of science	7
Elibrary	5
OpenAlex	9