Effect of carbon shell on stabilization of single-phase lanthanum and praseodymium hexaaluminates prepared by a modified Pechini method

Effect of carbon shell on stabilization of single-phase lanthanum and praseodymium hexaaluminates prepared by a modified Pechini method

Detaylı Bibliyografya
Parent link:Ceramics International
Vol. 46, iss. 18.— 2020.— [P. 29150-29159]
Müşterek Yazar: Национальный исследовательский Томский политехнический университет Исследовательская школа химических и биомедицинских технологий
Diğer Yazarlar: Stoyanovskii V. O. Vladimir, Vedyagin A. A. Aleksey Anatolievich, Volodin A. M. Aleksandr, Bespalko Yu. N. Yuliya
Özet:Title screen
A modified Pechini method involving the formation of carbon shell was proposed and used for the synthesis of the unsubstituted lanthanum and praseodymium hexaaluminates with the magnetoplumbite structure. The peculiarities of the LaAlO3 and LaAl11O18 phases' formation were studied in a wide temperature range starting from their appearance at 700 °C and finishing at 1300 °C when the complete phase formation occurs. It was found that the size of the formed hexaaluminate's crystallites is a crucial factor affecting the phase purity of the final product. The critical size of the thermodynamic stability of the LaAlO3 phase is supposed to be 10 nm, which corresponds to the specific surface area of 90 m2/g. The use of a carbon template approach leading to the formation of a core-shell structure during the synthesis procedure allows stabilizing the oxide particles in size and preventing their agglomeration at high temperatures. Depending on the carbon template nature, the carbon content in the samples was found to be 13 wt% (low-carbon-shelled samples) and 40 wt% (high-carbon-shelled samples). In the case of high carbon content, the resulting LaAl11O18 and PrAl11O18 hexaaluminates possess the surface areas as high as 160 m2/g.
Режим доступа: по договору с организацией-держателем ресурса
Dil:İngilizce
Baskı/Yayın Bilgisi: 2020
Konular:
электронный ресурс
труды учёных ТПУ
hexaaluminates
lanthanum
praseodymium
phase transformations
thermodynamic phase stability
carbon shell
фазовые превращения
стабильность
Online Erişim:https://doi.org/10.1016/j.ceramint.2020.08.088
Materyal Türü: Elektronik Kitap Bölümü
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663633

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