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Nanocrystalline ferrites NixZn1-xFe2O4: Influence of cation distribution on acidic and gas sensing propertiesстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Kazin A.P., Rumyantseva M.N., Prusakov V.E., Suzdalev I.P., Gaskov A.M.
- Журнал: Journal of Solid State Chemistry
- Том: 184
- Номер: 10
- Год издания: 2011
- Издательство: Elsevier B.V.
- Местоположение издательства: Netherlands
- Первая страница: 2799
- Последняя страница: 2805
- DOI: 10.1016/j.jssc.2011.08.029
- Аннотация: This work is devoted to a detailed analysis of the interconnection between composition, cation distribution and acidic properties of the surface of nanocrystalline ferrites NixZn1-xFe2O4 obtained by aerosol pyrolysis. The detailed analysis of the Mossbauer spectra allows us to determine the distribution of cations between tetrahedral and octahedral positions in spinel structure. Depending on samples composition, the tetrahedral positions can be occupied by only Fe3+ cations (inverse spine!, x >= 0.4) or by Fe3+ and Zn2+ cations (mixed spinel, x=0, 0.2). Increasing the nickel concentration in the ferrite leads to decrease in the number of strong acid centers on the surface. It was found that the decrease in the contribution of strong surface acid sites leads to an increase in sensory sensitivity of the ferrite towards ammonia. For ethanol detection an inverse relationship between sensor signal and surface acidity was observed. (C) 2011 Elsevier Inc. All rights reserved.
- Добавил в систему: Румянцева Марина Николаевна