Geodesic
Equilibrium of intrinsic and impurity point defects in Ca-doped Sm$_2$Zr$_2$O$_7$
Nanosistemy: fizika, himiâ, matematika, Tome 15 (2024) no. 1, pp. 65-79.

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In this work, a doping strategy was used to achieve a good conductivity in samarium zirconate which crystallizes in the pyrochlore. The production of nanopowders made it possible to form high-density ceramics with an optimal microstructure. It is shown that intrinsic and impurity defects coexist in Sm$_{2-x}$Ca$_x$Zr$_2$O$_{7-\delta}$, impairing ion transport at high doping levels. Despite this, Sm$_{1.95}$Ca$_{0.05}$Zr$_2$O$_{7-\delta}$ maintains low activation energy of the parent and has good ionic conductivity (10$^{-3}$ S $\cdot$ cm$^{-1}$ at 600$^\circ$C) which is one of the largest among oxide pyrochlores. It has been shown to have a good chemical stability. The material has a thermal expansion coefficient (TEC) of 12 ppm K$^{-1}$ which is higher than YSZ and provides better compatibility with electrode materials. The above makes it possible to successfully use it as a highly stable oxygen electrolyte or an intermediate thin layer at the electrolyte-electrode interface in electrochemical devices.
Keywords: solid oxide electrolyte, pyrochlores, grain boundary conductivity, nanoscale powders, combustion method. 
@article{NANO_2024_15_1_a8,
     author = {Vladimir A. Vorotnikov and Semyon A. Belyakov and Alexey V. Ivanov and Yulia V. Novikova and Anna Yu. Stroeva and Vadim V. Grebenev and Dmitry N. Khmelenin and Olga V. Emel'yanova and Maksim S. Plekhanov and Anton V. Kuz'min},
     title = {Equilibrium of intrinsic and impurity point defects in {Ca-doped} {Sm}$_2${Zr}$_2${O}$_7$},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {65--79},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {2024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2024_15_1_a8/}
}
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%A Vladimir A. Vorotnikov
%A Semyon A. Belyakov
%A Alexey V. Ivanov
%A Yulia V. Novikova
%A Anna Yu. Stroeva
%A Vadim V. Grebenev
%A Dmitry N. Khmelenin
%A Olga V. Emel'yanova
%A Maksim S. Plekhanov
%A Anton V. Kuz'min
%T Equilibrium of intrinsic and impurity point defects in Ca-doped Sm$_2$Zr$_2$O$_7$
%J Nanosistemy: fizika, himiâ, matematika
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Vladimir A. Vorotnikov; Semyon A. Belyakov; Alexey V. Ivanov; Yulia V. Novikova; Anna Yu. Stroeva; Vadim V. Grebenev; Dmitry N. Khmelenin; Olga V. Emel'yanova; Maksim S. Plekhanov; Anton V. Kuz'min. Equilibrium of intrinsic and impurity point defects in Ca-doped Sm$_2$Zr$_2$O$_7$. Nanosistemy: fizika, himiâ, matematika, Tome 15 (2024) no. 1, pp. 65-79. http://geodesic.mathdoc.fr/item/NANO_2024_15_1_a8/