Abstract: 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 °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 ZrO2@C and δ-Al2O3@C it is demonstrated that it is the preservation of the small particle size that accounts for the preservation of cubic ZrO2 and δ-Al2O3 until the carbothermal reduction temperatures of the corresponding oxides (above 1400 °C for Al2O3). 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.

Cite: Volodin A.M. , Bedilo A.F. , Stoyanovskii V.O. , Zaikovskii V.I.
High-Temperature Synthesis of Finely Dispersed Oxide Materials and C12A7:e Electrides in Carbon Nanoreactor Conditions
Наносистемы: физика, химия, математика = Nanosystems: physics, chemistry, mathematics. 2018. V.9. N4. P.558-567. DOI: 10.17586/2220-8054-2018-9-4-558-567 WOS RSCI РИНЦ AN OpenAlex

Files: Full text from publisher

Dates:

Submitted:	Jun 9, 2018
Accepted:	Jul 10, 2018
Published print:	Aug 28, 2018
Published online:	Aug 31, 2018

Identifiers:

Web of science:	WOS:000454046200017
RSCI:	RSCI:35450441
Elibrary:	35450441
Chemical Abstracts:	2019:1719121
OpenAlex:	W2889155520

Citing:

DB	Citing
Elibrary	14
Web of science	6
OpenAlex	5

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