Изучение фазообразования в нанокомпозитах Fe2O3-Nd2O3→NdFeO3/Fe2O3 в результате термического отжига

Авторы

  • K.B. Egizbek Евразийский национальный университет им. Л.Н. Гумилева, Казахстан, г.Нур-Султан; Институт ядерной физики МЭ РК, Казахстан, г.Алматы http://orcid.org/0000-0003-1852-4948
  • K.K. Kadyrzhanov Евразийский национальный университет им. Л.Н. Гумилева, Казахстан, г.Нур-Султан http://orcid.org/0000-0002-8796-0316

DOI:

https://doi.org/10.26577/RCPh.2021.v78.i3.05

Ключевые слова:

шпинель, Fe2O3-Nd2O3→NdFeO3/Fe2O3, нанокомпозиты, катализаторы, термический отжиг, фазообразование

Аннотация

The aim of this work is systematic study of the thermal annealing effect on the preparation of nanostructured composites NdFeO3/Fe2O3 with a spinel type structure. The interest in these nanocomposites is due to the enormous potential of their application as a basis for magnetic devices, catalysts, and magnetic carriers for targeted drug delivery. As a synthesis method, two-stage synthesis was used, which includes mechanochemical grinding of nanopowders Fe2O3 and Nd2O3 in a planetary mill, followed by thermal annealing of the resulting mixture in a wide temperature range: 600-1000°C. During the studies carried out, it was found that in the initial state the obtained nanocomposites are a mixture of a solid solution of interstitial and substitutional Fe2O3 and Nd2O3. At an annealing temperature of 600°C, the onset of the formation of the NdFeO3 phase is observed, which at a temperature of 1000°C is fully formed and dominates in the composite structure (content more than 85%). It was also found that during thermal sintering, the processes of phase transformations of the Fe2O3-Nd2O3→NdFeO3/Fe2O3 type are accompanied by an increase in the particle size by a factor of 1.5-2.

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Загрузки

Опубликован

2021-08-26

Выпуск

Раздел

Физика конденсированного состояния и проблемы материаловедения. Нанонаука