The oxidation kinetics study of ultrafine iron powders by thermogravimetric analysis

Lysenko, Elena; Суржиков, А. П.; Журавков, С. П.; Vlasov, V. A.; Pustovalov, Alexey V.; Yavorovsky, N.

doi:10.1007/s10973-013-3456-x

Cited by 42 publications

(25 citation statements)

References 14 publications

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“…The samples used for Mössbauer Spectrometry were grown from a 57 Feenriched target with the same parameters as above. The target was synthesized as described before, but adding to the standard Fe 2 O 3 precursors 80% of the enriched oxide, prepared by annealing of 57 Fe powders at 800°C for 2 h in a constant oxygen flow of 18 l/h 44 . CEMS measurements were performed in normal incidence using a home-made gas flow (He − CH 4 ) proportional counter 45 .…”

Section: Mössbauer Spectrometrymentioning

confidence: 99%

Structure and magnetic properties of epitaxial CaFe2O4 thin films

et al. 2020

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CaFe 2 O 4 is a highly anisotropic antiferromagnet reported to display two spin arrangements with up-up-down-down (phase A) and up-down-up-down (phase B) configurations. The relative stability of these phases is ruled by the competing ferromagnetic and antiferromagnetic interactions between Fe 3+ spins arranged in two different environments, but a complete understanding of the magnetic structure of this material does not exist yet. In this study, we investigate epitaxial CaFe 2 O 4 thin films grown on TiO 2 (110) substrates by means of pulsed laser deposition (PLD). Structural characterization reveals the coexistence of two out-of-plane crystal orientations and the formation of three in-plane oriented domains. The magnetic properties of the films, investigated macroscopically as well as locally, including highly sensitive Mössbauer spectroscopy, reveal the presence of just one order parameter showing long-range ordering below T = 185 K and the critical nature of the transition. In addition, a non-zero in-plane magnetization is found, consistent with the presence of uncompensated spins at phase or domain boundaries, as proposed for bulk samples.

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Section: Mössbauer Spectrometrymentioning

confidence: 99%

Structure and magnetic properties of epitaxial CaFe2O4 thin films

et al. 2020

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“…The residual mass content does not match exactly the Fe weight percent, and tends to increase with increasing the temperature. This could be due to the formation of iron oxides during the thermal scan, inducted by presence of traces oxygen in the oven and/or inside the EVA samples …”

Section: Resultsmentioning

confidence: 99%

Smart behavior of elastomeric composites produced by injection molding

Volpe

Davino

Sorrentino

et al. 2018

J of Applied Polymer Sci

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This work reports the preparation and characterization of composites based on ethylene vinyl acetate (EVA) and iron based powder produced by an injection molding machine specifically designed to host an electromagnet connected to a power supply which generates a magnetic field during the forming phases. The magnetic field allows the repositioning of the particles along the magnetic field lines leading to an anisotropic structural reinforcement. Thermogravimetric analyses show that the addition of iron powder to the EVA allows thermal stabilization, delaying the first degradation step ascribed to the loss of acetic acid. Mechanical characterizations show that the samples present a higher tensile modulus in the direction of the magnetic field with respect to the same property measured in the direction perpendicular to the magnetic field and considerably higher than the modulus of the samples obtained without the application of magnetic field. Furthermore, the samples obtained in the presence of magnetic field present sensitivity to the application of an external magnetic field. These results demonstrate that the application of a magnetic field during the injection molding process of EVA/Fe composite induced an alignment of the particles, which therefore induce peculiar properties to the samples.

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“…The samples used for Mssbauer Spectrometry were grown from a 57 F e enriched target with the same parameters as above. The target was synthesized as described before, but adding to the standard F e 2 O 3 precursors 80% of the enriched oxide, prepared by annealing of 57 F e powders at 800 • C for 2 hours in a constant oxygen flow of 18 l/h [44]. CEMS measurements were performed in normal incidence using a home-made gas flow (He − CH 4 ) proportional counter [45].…”

Section: Sample Growthmentioning

confidence: 99%

Structure and magnetic properties of epitaxial CaFe2O4 thin films

Damerio,

Nukala,

Juraszek

et al. 2020

Preprint

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CaF e2O4 is a highly anisotropic antiferromagnet reported to display two spin arrangements with up-up-down-down (phase A) and up-down-up-down (phase B) configurations. The relative stability of these phases is ruled by the competing ferromagnetic and antiferromagnetic interactions between F e 3+ spins arranged in two different environments, but a complete understanding of the magnetic structure of this material does not exist yet. In this study we investigate epitaxial CaF e2O4 thin films grown on T iO2 (110) substrates by means of Pulsed Laser Deposition (PLD). Structural characterization reveals the coexistence of two out-of-plane crystal orientations and the formation of three in-plane oriented domains. The magnetic properties of the films, investigated macroscopically as well as locally, including highly sensitive Mssbauer spectroscopy, reveal long-range ordering below T = 185 K and a non-zero in-plane magnetization, consistent with the presence of uncompensated spins at the A/B phase boundaries, as proposed by Stock et al. for bulk samples.

show abstract

The oxidation kinetics study of ultrafine iron powders by thermogravimetric analysis

Cited by 42 publications

References 14 publications

Structure and magnetic properties of epitaxial CaFe2O4 thin films

Structure and magnetic properties of epitaxial CaFe2O4 thin films

Smart behavior of elastomeric composites produced by injection molding

Structure and magnetic properties of epitaxial CaFe2O4 thin films

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