Study of the Fe-Si Order-Disorder Transformation

Glaser, Frank W.; Ivanick, W.

doi:10.1007/bf03377868

Cited by 12 publications

(21 citation statements)

References 5 publications

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“…11,[32][33][34]36,37 The analysis of the remaining sextet components is not straightforward and requires a comparison with the possible structures of the Fe 1Àx Si x alloys. These have been long time ago studied in bulk samples 24,[38][39][40] and in homogenous thin films prepared by co-deposition. [19][20][21][22] For x up to $0.12 Si randomly substitutes Fe in the bcc structure of a-Fe, forming a disordered alloy.…”

Section: B Compositional Study By Cemsmentioning

confidence: 99%

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Iron silicide formation at different layers of (Fe/Si)3 multilayered structures determined by conversion electron Mössbauer spectroscopy

Badía-Romano

Rubín

Magén

et al. 2014

Journal of Applied Physics

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The morphology and the quantitative composition of the Fe-Si interface layer forming at each Fe layer of a (Fe/Si)3 multilayer have been determined by means of conversion electron Mössbauer spectroscopy (CEMS) and high-resolution transmission electron microscopy (HRTEM). For the CEMS measurements, each layer was selected by depositing the Mössbauer active 57Fe isotope with 95% enrichment. Samples with Fe layers of nominal thickness dFe = 2.6 nm and Si spacers of dSi = 1.5 nm were prepared by thermal evaporation onto a GaAs(001) substrate with an intermediate Ag(001) buffer layer. HRTEM images showed that Si layers grow amorphous and the epitaxial growth of the Fe is good only for the first deposited layer. The CEMS spectra show that at all Fe/Si and Si/Fe interfaces a paramagnetic c-Fe1−xSi phase is formed, which contains 16% of the nominal Fe deposited in the Fe layer. The bottom Fe layer, which is in contact with the Ag buffer, also contains α-Fe and an Fe1−xSix alloy that cannot be attributed to a single phase. In contrast, the other two layers only comprise an Fe1−xSix alloy with a Si concentration of ≃0.15, but no α-Fe.

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Section: B Compositional Study By Cemsmentioning

confidence: 99%

“…Si. 24,[38][39][40] At x ¼ 0.25, the stoichiometric compound Fe 3 Si is formed (Fig. 3) with the D0 3 type structure; this is an ordered structure, where Si substitutes Fe only at the D sites under the steric constraint of a minimum Si-Si distance ffiffiffiffiffi 2a p (be a the Fe-Fe interatomic distance).…”

Section: B Compositional Study By Cemsmentioning

confidence: 99%

Iron silicide formation at different layers of (Fe/Si)3 multilayered structures determined by conversion electron Mössbauer spectroscopy

Badía-Romano

Rubín

Magén

et al. 2014

Journal of Applied Physics

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“…One of the positive influences of silicon in the alloy, with respect the magnetic properties, is the increase in resistivity while at the same time reducing magnetostriction and energy loss [10 and 96] . This effect may be directly related to ordering: a sample with low ordering presents higher resistivity although short range ordering has the opposite influence [97] . Saturation magnetostriction (the cause of the characteristic "humming" in electric devices) is practically zero at 12.2 at .% Si, making vibration almost disappear.…”

Section: Influence Of Ordering On Electric and Magnetic Propertiesmentioning

confidence: 99%

“…For example, powdered Fe-15 mass. % Si (Fe 3 Si) samples with high degree of order showed a resistivity of 50 mW/cm while for a quenched state the resistivity is 150 mW/cm [97] . It is well established that D0 3 ordering causes deterioration of magnetic properties in magnetic permeability experiments [98] and as such, high maximum permeability is obtained after rapid quench from 500 o C for Si-contents near 12 at.…”

Section: Influence Of Ordering On Electric and Magnetic Propertiesmentioning

confidence: 99%

A review of ordering phenomena in iron-silicon alloys

Villafañe¹,

Houbaert²

2013

REVMETAL

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Silicon steel is an industrially-desired alloy of iron and silicon, characterised by soft magnetic properties, low eddy-current losses, and low magnetostriction. Silicon steels have narrow hysteresis cycles, making them particularly advantageous in applications using electromagnetic fields, such as transformers, generators, electric motor cores, and few other components in industry. Despite its incontestable industrial value, there is not much agreement on the atomic structure of silicon steel. Gaining better understanding of e.g. ordering processes in Fe-Si alloys could not only explain their magnetic properties, but also open opportunities to reduce their weaker characteristics, such as brittleness that adversely affects silicon steel workability and its associated high production costs. This review summarises the state-of-the-art knowledge about ordering in silicon steel and describes the most relevant experimental techniques used for studying its microstructure. In addition, the process of building the iron rich part of the Fe-Si phase diagram is explained. Lastly, the influence of order on the alloy's magnetic and mechanical properties is illustrated. KeywordsOrdering; Iron-silicon alloys; Intermetallic phases; Mechanical properties; Phase diagram. Revisión de fenómenos de orden en aleaciones hierro-silicio ResumenEl acero al silicio es una aleación de importancia industrial, caracterizada por propiedades magnéticas blandas, bajas pérdidas por corrientes de Foucault y baja magnetostricción. Los aceros al silicio tienen ciclo de histéresis estrecho, lo que es una ventaja en aplicaciones con campos electromagnéticos, como transformadores, generadores, núcleos de motores eléctricos y otros componentes industriales. A pesar de su incomparable valor industrial, no hay convenio sobre la estructura atómica del acero al silicio. Obtener mayor conocimiento sobre los procesos de orden no sólo podría explicar las propiedades magnéticas sino que también podría abrir vías para la reducción de sus características más débiles, como su fragilidad, la cual afecta negativamente a la fabricación del acero al silicio y se asocia con altos costes de producción. Esta revisión resume los últimos conocimientos sobre orden en acero al silicio y describe las técnicas experimentales más importantes usadas para estudiar su estructura. Además, se da una explicación sobre la construcción de la parte rica en hierro del diagrama de fases del Fe-Si. Por último se ilustra la influencia del orden en las propiedades magnéticas y mecánicas. Palabras claveOrden; Aleaciones hierro-silicio; Fases intermetálicas; Propiedades mecánicas; Diagrama de fases.

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“…As it follows from the comparison of the experimental data with the reference X-ray diffraction patterns for all the phases [15,21] as well as with the Curie temperatures known (indicated by arrows in Fig. 5) [22][23][24][25][26][27], the following phases -Fe 5 SiC, Fe 3 Si, Fe 3 C and ␣-Fe -are present in the samples after annealing, with the phase proportions dependent on the initial mixture compositions. Note that only one iron silicon carbide forms, which is Fe 5 SiC, whatever the proportion of Si and C content in the quasibinary Fe(70)Si(x)C(30 − x) system is.…”

Section: Annealed Fe(70)si(x)c(30 − X) Samplesmentioning

confidence: 99%