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Reversible Exsolution of Nanometric Fe2O3 Particles in BaFe2-x(PO4)(2) (0 <= x <= 2/3): The Logic of Vacancy Ordering in Novel Metal-Depleted Two-Dimensional Latticesстатья
Статья опубликована в высокорейтинговом журнале
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: 17 ноября 2015 г.
- Авторы: Alcover Ignacio Blazquez, David Renald, Daviero-Minaud Sylvie, Filimonov Dmitry, Huve Marielle, Roussel Pascal, Kabbour Houria, Mentre Olivier
- Журнал: Crystal Growth and Design
- Том: 15
- Номер: 9
- Год издания: 2015
- Издательство: American Chemical Society
- Местоположение издательства: United States
- Первая страница: 4237
- Последняя страница: 4247
- DOI: 10.1021/acs.cgd.5b00525
- Аннотация: We show here that the exsolution of Fe2+ ions out of two-dimensional (2D) honeycomb layers of BaFe2(PO4)(2) into iron-deficient BaFe2-x(PO4)(2) phases and nanometric alpha-Fe2O3 (typically 50 nm diameter at the grain surface) is efficient and reversible until x = 2/3 in mild oxidizing/reducing conditions. It corresponds to the renewable conversion of 12 wt % of the initial mass into iron oxide. After analyzing single crystal X-ray diffraction data of intermediate members x = 2/7, x = 1/3, x = 1/2 and the ultimate Fe-depleted x = 2/3 term, we observed a systematic full ordering between Fe ions and vacancies (V-Fe) that denote unprecedented easy in-plane metal diffusion driven by the Fe2+/Fe3+ redox. Besides the discovery of a diversity of original depleted triangular infinityFe2/3+’ O-2-x(6) topologies, we propose a unified model correlating the x Fe-removal and the experimental Fe/V-Fe ordering into periodic one-dimensional motifs paving the layers, gaining insights into predictive crystal chemistry of complex low dimensional oxides. Increasing the x values led to a progressive change of the materials from 2D ferromagnets (Fe2+) to 2D ferrimagnets (Fe2/3+) to antiferromagnets for x = 2/3 (Fe3+).
- Добавил в систему: Филимонов Дмитрий Сергеевич