Synthesis of Fe:Al2O3 thin films by ion beam sputtering: Interface effect

Marest, G.; Moncoffre, N.; Thimon, F.; Brunel, M.; Esnouf, C.

doi:10.1007/bf02065771

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Usually, the reaction assumed for hercynite formation is FeO +Al 2 O 3 Ͼ FeAl 2 O 4 . 39 However, in the present study, as in the previous one we conducted using Fe-Al 2 O 3 arc-melted samples, there are no available sources of free oxygen for the reaction with iron dissolved in alumina. For this reason, we suggest that the iron dissolved in alumina by mechanical action in the milling process forms hercynite with oxygen vacancies, i.e., FeAl 2 O 3+W ͑0 ഛ W ഛ 1͒.…”

Section: Resultsmentioning

confidence: 68%

“…Based on these evidences and on previous Mössbauer data reported in the literature, we attribute the QS component to the hercynite phase ͑FeAl 2 O 4 ͒ in spite of some contradiction in the earlier results on account of different methods of sample preparation. [30][31][32][33][34][35][36][37][38][39] The absence of the lines respective to this spinel structure in our x-ray diffractograms may be attributed to the size of the hercynite grains that are probably too small to be seen by XRD.…”

Section: Resultsmentioning

confidence: 99%

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Structural and Mössbauer characterization of the ball-milledFex(Al2O3)100−x system

Paesano

Matsuda

Cótica

et al. 2004

Journal of Applied Physics

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Metal-oxide composites were synthesized by high-energy ball milling of metallic iron ͑␣-Fe͒ and alumina ͑␣-Al 2 O 3 ͒ powders, varying the starting relative concentration and the milling time. The samples were characterized by scanning electron microscopy, x-ray diffraction, and Mössbauer spectroscopy. The results revealed the formation of a FeAl 2 O 3+W spinel phase (hercynite) and of iron (super)paramagnetic nanoprecipitates, in addition to residual magnetic iron and alumina. We also observed that the relative amounts of nanoprecipitates and hercynite for isochronally milled samples were correlated with the sample nominal concentration x, with the precursor iron being relatively more converted in those phases for low x values. Particularly for x = 10 milled sample, the relative amounts of the (super)paramagnetic and spinel phases were observed to increase linearly with the milling time. An x = 20/ 24 h milled sample was annealed in H 2 atmosphere and revealed the reduction of hercynite, with iron phase separation.

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Section: Resultsmentioning

confidence: 68%

Section: Resultsmentioning

confidence: 99%

Structural and Mössbauer characterization of the ball-milledFex(Al2O3)100−x system

Paesano

Matsuda

Cótica

et al. 2004

Journal of Applied Physics

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Synthesis and characterization of Fe-Al2O3 composites

Paesano

Matsuda

Cunha

et al. 2003

Journal of Magnetism and Magnetic Materials

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Thermally induced transformations at an ion implanted α–Fe2O3/α–Al2O3 interface: A Mössbauer spectroscopy study

Bhagwat

Joshi

Ogale

et al. 1996

Journal of Applied Physics

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Thermally induced chemical transformations at the interface between a 100 nm α–Fe2O3 and a polycrystalline α–Al2O3 substrate are studied and compared for the cases of the as-formed and ion bombarded interfaces. The thermal annealings are carried out under vacuum at 450 °C for different time durations and the transformations are examined by conversion electron Mössbauer spectroscopy. It is shown that in the sample prebombarded with 110 keV Ar+ ions, the formation of Fe3−xAlxO4, FeAl2O4, and FeO phases is favored at variance with a nonbombarded sample in which primarily a defective Fe3O4-y phase is produced with some amount of FeO. This difference is explained in terms of the annealing process of the oxygen vacancies produced during Ar implantation near the interfacial region.

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Synthesis of Fe:Al2O3 thin films by ion beam sputtering: Interface effect

Cited by 3 publications

References 21 publications

Structural and Mössbauer characterization of the ball-milledFex(Al2O3)100−x system

Structural and Mössbauer characterization of the ball-milledFex(Al2O3)100−x system

Synthesis and characterization of Fe-Al2O3 composites

Thermally induced transformations at an ion implanted α–Fe2O3/α–Al2O3 interface: A Mössbauer spectroscopy study

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