Реферат: Intensive phase transformations of alumina are known to occur at temperatures above 1000 °C. In the present work, high temperature behaviour of pure Al2O3 and the carbon coated Al2O3@C sample with core-shell structure was comparatively studied using low-temperature nitrogen adsorption, transmission electron microscopy, powder X-ray diffraction (XRD) analysis and solid-state nuclear magnetic resonance (NMR). The solid-state NMR 27Al method has allowed us to identify and estimate the concentration of all phases appeared during the transformation of pseudoboehmite γ-Al2O3 into corundum α-Al2O3. The data obtained correlate well with the results of XRD analysis and low-temperature nitrogen adsorption. It is shown that the deposition of carbon coating with formation of core-shell Al2O3@C system stabilizes the size of oxide core and prevents the formation of corundum phase until the temperatures of 1350-1400 °C, which are close to the temperature of carbothermal reduction of alumina. The stabilization of the size of the oxide core nanoparticles was considered as a main factor preventing the formation of corundum phase at high temperatures. At the same time, the carbon coating does not affect the phase transformation of γ-Al2O3 to δ-Al2O3.

Библиографическая ссылка: Yakovlev I.V. , Volodin A.M. , Zaikovskii V.I. , Stoyanovskii V.O. , Lapina O.B. , Vedyagin A.A.
Stabilizing Effect of the Carbon Shell on Phase Transformation of the Nanocrystalline Alumina Particles
Ceramics International. 2018. V.44. N5. P.4801-4806. DOI: 10.1016/j.ceramint.2017.12.066 WOS Scopus РИНЦ CAPlus OpenAlex

Даты:

Поступила в редакцию:	2 дек. 2017 г.
Принята к публикации:	8 дек. 2017 г.
Опубликована online:	10 дек. 2017 г.
Опубликована в печати:	1 апр. 2018 г.

Идентификаторы БД:

Web of science:	WOS:000425204400035
Scopus:	2-s2.0-85039045644
РИНЦ:	35522649
Chemical Abstracts:	2017:1972750
OpenAlex:	W2774069611

Цитирование в БД:

БД	Цитирований
Web of science	19
Scopus	22
РИНЦ	22
OpenAlex	24

Альметрики: