Mössbauer study of the reduction ofγ-Fe2O3 in hydrogen

Klissurski, D.; Mitov, Ivan; Tomov, T.; Gyurova, L.; Zapletal, V.; Šubrt, Ján; Bechine, K.

doi:10.1007/bf01728679

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Маггемит (γ-Fe 2 O 3 ) обладает двумя неэквивалентными подрешетками: тетра-(А) и октаэдрической (В), но в отличии от магнетита, в подрешетках находятся только ионы Fe 3+ [53]. Поэтому МС маггемита представляют собой суперпозицию двух парциальных зеемановских секстиплетов, принадлежащих ионам железа в А-и В-подрешетках [56][57][58][59][60][61][62][63].…”

Section: экспериментальные результаты и обсуждениеunclassified

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Мёссбауэровские исследования состава и магнитной структуры нанокомпозитов Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-/γFe-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- типа ядро--оболочка при температура 300 и 80 K (Часть I)

Kamzin¹,

Obaidat

Валлиулин³

et al. 2020

Физика Твердого Тела

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The results of Mössbauer studies of the magnetic structure and composition of Fe3O4 / γ-Fe2O3 nanoparticles at temperatures of 300 and 80 K are presented. It was found that particles Fe3O4 /γ-Fe2O3 is a core / shell nanocomposite (NC) in which magnetite (Fe3O4) is a coated by shell of maghemite (γ-Fe2O3). It was shown that the thickness of the maghemite (γ-Fe2O3) shell depends on the synthesis technology. It was found that, in the Fe3O4 /γ-Fe2O3 NC, on the surface of the maghemite (γ-Fe2O3) shell, a layer whose magnetic structure differs from the structure of the inner part of the shell (γ-Fe2O3). An intermediate layer is formed between the core and the shell in a spin-glass state. The obtained data on the structure of core / shell nanocomposites open up prospects for explaining the properties of such particles, which are of great interest for applications in various fields, including biomedicine.

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Section: экспериментальные результаты и обсуждениеunclassified

“…Fe 2 O 3[56][57][58][59][60][61][62][63]. По положениям зеемановских линий МС НК Fe 3 O 4 /γ-Fe 2 O 3 , полученных при 300 K, были рассчитаны параметры сверхтонких взаимодействий…”

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Мёссбауэровские исследования состава и магнитной структуры нанокомпозитов Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=-/γFe-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- типа ядро--оболочка при температура 300 и 80 K (Часть I)

Kamzin¹,

Obaidat

Валлиулин³

et al. 2020

Физика Твердого Тела

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Size-dependent redox behavior of iron observed by in-situ single nanoparticle spectro-microscopy on well-defined model systems

Karim

Kleibert

Hartfelder

et al. 2016

Sci Rep

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Understanding the chemistry of nanoparticles is crucial in many applications. Their synthesis in a controlled manner and their characterization at the single particle level is essential to gain deeper insight into chemical mechanisms. In this work, single nanoparticle spectro-microscopy with top-down nanofabrication is demonstrated to study individual iron nanoparticles of nine different lateral dimensions from 80 nm down to 6 nm. The particles are probed simultaneously, under same conditions, during in-situ redox reaction using X-ray photoemission electron microscopy elucidating the size effect during the early stage of oxidation, yielding time-dependent evolution of iron oxides and the mechanism for the inter-conversion of oxides in nanoparticles. Fabrication of well-defined system followed by visualization and investigation of singled-out particles eliminates the ambiguities emerging from dispersed nanoparticles and reveals a significant increase in the initial rate of oxidation with decreasing size, but the reactivity per active site basis and the intrinsic chemical properties in the particles remain the same in the scale of interest. This advance of nanopatterning together with spatially-resolved single nanoparticle X-ray absorption spectroscopy will guide future discourse in understanding the impact of confinement of metal nanoparticles and pave way to solve fundamental questions in material science, chemical physics, magnetism, nanomedicine and nanocatalysis.

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The Composition and Magnetic Structure of Fe3O4/γ-Fe2O3 Core–Shell Nanocomposites at 300 and 80 K: Mössbauer Study (Part I)

et al. 2020

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Mössbauer study of the reduction ofγ-Fe2O3 in hydrogen

Cited by 3 publications

References 5 publications

Size-dependent redox behavior of iron observed by in-situ single nanoparticle spectro-microscopy on well-defined model systems

The Composition and Magnetic Structure of Fe3O4/γ-Fe2O3 Core–Shell Nanocomposites at 300 and 80 K: Mössbauer Study (Part I)

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