Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Oxide ionic transport features in Gd-doped La nickelates. / Sadykov, Vladislav A.; Sadovskaya, Ekaterina M.; Filonova, Elena A. и др.
в: Solid State Ionics, Том 357, 115462, 01.12.2020.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Oxide ionic transport features in Gd-doped La nickelates
AU - Sadykov, Vladislav A.
AU - Sadovskaya, Ekaterina M.
AU - Filonova, Elena A.
AU - Eremeev, Nikita F.
AU - Belyaev, Vladimir D.
AU - Tsvinkinberg, Viktor A.
AU - Pikalova, Elena Yu
PY - 2020/12/1
Y1 - 2020/12/1
N2 - 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.
AB - 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.
KW - Chemical diffusion
KW - Mass relaxation
KW - Oxygen isotope exchange
KW - Oxygen mobility and surface reactivity
KW - Ruddlesden – Popper phases
KW - Structure evolution
KW - SURFACE EXCHANGE
KW - STABILITY
KW - DEFECT
KW - FUEL-CELLS
KW - MASS-TRANSPORT
KW - INTERSTITIAL OXYGEN
KW - CATHODE
KW - Ruddlesden - Popper phases
KW - OXYGEN-EXCHANGE KINETICS
KW - DIFFUSION
KW - ELECTROCHEMICAL PERFORMANCE
UR - http://www.scopus.com/inward/record.url?scp=85091250040&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2020.115462
DO - 10.1016/j.ssi.2020.115462
M3 - Article
AN - SCOPUS:85091250040
VL - 357
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
M1 - 115462
ER -
ID: 25313372