Geodesic
High-temperature synthesis of finely dispersed oxide materials and C12A7:e electrides in carbon nanoreactor conditions
Nanosistemy: fizika, himiâ, matematika, Tome 9 (2018) no. 4, pp. 558-567.

Voir la notice de l'article provenant de la source Math-Net.Ru

Solid-state transformations of the oxide core in core-shell structures Oxide@C consisting of oxide nanoparticles covered with a carbon coating were studied at temperatures of up to 1500$^\circ$ C. It is shown that such coating can stabilize the size of the oxide core nanoparticles for alumina, zirconia, calcium and lanthanum aluminates and act as a shell of a nanoreactor where phase and chemical transformation can take place. For ZrO$_2$@C and Al$_2$O$_3$@C it is demonstrated that it is the preservation of the small particle size that accounts for the preservation of cubic ZrO$_2$ and $\delta$-Al$_2$O$_3$ until the carbothermal reduction temperatures of the corresponding oxides (above 1400$^\circ$ C for Al$_2$O$_3$). The electride state C12A7:e is shown to be formed in C12A7@C material at temperatures above its melting point. The surface of activated C12A7 was found to have a significant concentration of active OH radicals capable of converting diphenylamine into stable nitroxyl radicals.
Keywords: Core-shell, nanocrystalline oxide, electride, Al$_2$O$_3$, carbon nanoreactor.
Mots-clés : ZrO$_2$ 
@article{NANO_2018_9_4_a16,
     author = {A. M. Volodin and A. F. Bedilo and V. O. Stoyanovskii and V. I. Zaikovskii},
     title = {High-temperature synthesis of finely dispersed oxide materials and {C12A7:e} electrides in carbon nanoreactor conditions},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {558--567},
     publisher = {mathdoc},
     volume = {9},
     number = {4},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2018_9_4_a16/}
}
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A. M. Volodin; A. F. Bedilo; V. O. Stoyanovskii; V. I. Zaikovskii. High-temperature synthesis of finely dispersed oxide materials and C12A7:e electrides in carbon nanoreactor conditions. Nanosistemy: fizika, himiâ, matematika, Tome 9 (2018) no. 4, pp. 558-567. http://geodesic.mathdoc.fr/item/NANO_2018_9_4_a16/