Mechanical properties of magnetite (Fe3O4), hematite (α-Fe2O3) and goethite (α-FeO·OH) by instrumented indentation and molecular dynamics analysis

Chicot, Didier; Mendoza, Johnny; Zaoui, A.; Louis, G.; Lépingle, V.; Roudet, Francine; Lesage, Jacky

doi:10.1016/j.matchemphys.2011.05.056

Cited by 180 publications

(74 citation statements)

References 51 publications

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“…2a. The absence of sharp, well defined peaks could be attributed to the local structural disorder of the oxides [52]. The spectra from the outer layer shows several broad bands.…”

Section: Sem/edx and Raman Spectroscopymentioning

confidence: 95%

Evaluation of the Mechanical Properties of Naturally Grown Multilayered Oxides Formed on HCM12A Using Small Scale Mechanical Testing

et al. 2015

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The microstructure and mechanical integrity of protective multilayered oxide films grown in liquid metal on F/M steel HCM12A was investigated utilizing Raman spectroscopy, nanoindentation and micro-cantilever testing methods. The Raman spectra showed a Fe 3 O 4 outer layer and a Cr-rich spinel structure inner layer. The nanoindentation results showed a higher hardness value for the inner layer than for the outer layer. In addition, the hardness of the diffusion layer in between the inner layer and the bulk steel was measured. Quantitative fracture properties were obtained of the steel/oxide interface and within the oxide layers utilizing microcantilever testing. Furthermore the strength and elastic properties of the multilayered oxide film were measured and it was found that the porous structure in the inner Fe-Cr oxide limits the integrity of the steel/oxide interface.

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“…2a. The absence of sharp, well defined peaks could be attributed to the local structural disorder of the oxides [52]. The spectra from the outer layer shows several broad bands.…”

Section: Sem/edx and Raman Spectroscopymentioning

confidence: 95%

Evaluation of the Mechanical Properties of Naturally Grown Multilayered Oxides Formed on HCM12A Using Small Scale Mechanical Testing

et al. 2015

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“…Young' modulus, E, poisson's ratio, ν and effective surface energy, γ of hematite and magnetite at each temperature were taken from the references [32][33][34][35] and listed in Table 3. γ is expressed by the Griffith's fracture criterion, 36) as shown in Eq.…”

Section: Basic Concept Of Crack Areamentioning

confidence: 99%

“…However, the influence of Poisson's ratio of the porous material has on its rigidity is known as small, 38) utilizing the literature value at room temperature 33) in this study.…”

Section: Basic Concept Of Crack Areamentioning

confidence: 99%

Influence of Reducing Gas Composition on Disintegration Behavior of Iron Ore Agglomerates

et al. 2017

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H 2 injection through the shaft into blast furnace (BF) is a potential option for a further reduction of CO 2 emission from BF. H 2 promotes reduction reaction of burden materials, but its influence on their reduction disintegration behavior remains unknown in detail. This study has investigated the influence on the iron ore sinter, self-fluxed and acid pellets and specified essential factors governing the reduction disintegration behavior.Mass ratios of particles below 3 mm in size were measured as an index for reduction disintegration (RDI) after the reduction of burden samples applying the gas mixtures of CO-H 2 -CO 2 -N 2 at 823 K. The reduced samples were observed by an optical-microscope and an electron probe micro-analyzer for evaluation of reaction mode. Further, using the measurement results, stress, strain energy and crack area generated during reduction were calculated and formation mechanism of cracks was examined.RDI value of self-fluxed pellet increased under higher H 2 condition (40%N 2 -20%H 2 -10%CO-30%CO 2 ) and reached to 26 mass%. Such an increase was larger than expected from the standard RDI measure without H 2 . Sample observation revealed a fact that reaction mode governed RDI value, that is, disintegration worsened under the reduction with non-topochemical mode. The fact was explained by the calculation as an influence of crack formation and propagation. In a case of reduction with topochemical reaction, cracks generated in a concentric fashion. Meanwhile, reduction with non-topochemical reaction tended to generate cracks in radial direction, which causes pellet chipping and further degradation. Calculated crack areas showed good correlation with RDI values. The Crack area of non-toochemical reaction was more than double than that of topochemical reaction. This result indicates that disintegration does not much progress when crack area is less than the certain limit value, but it proceeds drastically when it exceeded the limit value.

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“…Our calculations use parameters ν c = 0.37, K c = 84 GPa, G c = 24 GPa, 26) ν Fe 3 O 4 = 0.37, K Fe 3 O 4 = 227 GPa, and G Fe 3 O 4 = 63 GPa. 27) Since the shell is a medium and Fe 3 O 4 (roundly f = 0.4) mixure, the bulk and shear modulus are calculated by…”

Section: Thermal Strain Of Ag@fe 3 O 4 Nanoflowersmentioning

confidence: 99%

Thermal-Induced Stress of Plasmonic Magnetic Nanocomposites

2017

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We present theoretical calculations to interpret optical and mechanical properties of Ag@Fe 3 O 4 nanoflowers. The microstructures and nature of optical peaks of nanoflowers are determined by means of the Mie theory associated with effective dielectric approximation and the experimental absorption spectrum. Under laser illumination, the thermal strain fields inside and outside the structure due to the absorbed optical energy are studied using continuum mechanics approach. Our findings provide simple but comprehensive description of the elastic behaviors of previous experiments.

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Mechanical properties of magnetite (Fe3O4), hematite (α-Fe2O3) and goethite (α-FeO·OH) by instrumented indentation and molecular dynamics analysis

Cited by 180 publications

References 51 publications

Evaluation of the Mechanical Properties of Naturally Grown Multilayered Oxides Formed on HCM12A Using Small Scale Mechanical Testing

Evaluation of the Mechanical Properties of Naturally Grown Multilayered Oxides Formed on HCM12A Using Small Scale Mechanical Testing

Influence of Reducing Gas Composition on Disintegration Behavior of Iron Ore Agglomerates

Thermal-Induced Stress of Plasmonic Magnetic Nanocomposites

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