Thermal stability and hyperfine interactions of mechanically alloyed Fe–Ge phases

Jartych, E.; Oleszak, D.; Кубалова, Л. М.; Vasilyeva, O.Ya.; Żurawicz, J.K.; Pikula, T.; Fedotov, S. A.

doi:10.1016/j.jallcom.2006.04.053

Cited by 8 publications

(5 citation statements)

References 13 publications

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“…Fe-Ge may be considered as a model system [3] for studying the sensitivity of various mechanisms of energy losses to such structural changes, as it involves several phase transformations due to structural ordering by varying Ge content and temperature [4][5][6][7][8][9][10]. Depending on structure different mechanisms of anelasticity caused by point defects, dislocations and grain boundaries would be expected.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on structure different mechanisms of anelasticity caused by point defects, dislocations and grain boundaries would be expected. Many studies on the structure and magnetic transitions [5,6] in Fe-Ge alloys using X-ray and neutron diffraction [7] and Mö ssbauer spectroscopy [3,5,[7][8][9][10] have been performed, and a rich variety of structures and transformations of sometimes metastable phases in rapidly solidified [11] or mechanically alloyed samples [8] has been documented. Further interest in these alloys arises from the observation of dislocations on octahedral and cube planes in connection with an anomalous temperature dependence of the flow stress [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Structure and anelasticity of ordered and disordered Fe–Ge alloys

et al. 2010

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure and anelasticity of ordered and disordered Fe–Ge alloys

et al. 2010

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“…There is considerable interest in the Fe -Ge alloy system as a model system [9] involving several phase transformations including structural ordering [10] and variation of ferromagnetic properties [11,12], as shown, e.g. by X-ray and neutron diffraction studies [13] and by Mössbauer spectroscopy [9, 11, 13 -16].…”

Section: Introductionmentioning

confidence: 99%

Structure and Anelasticity of Fe-Ge Alloys

Golovin

Ivleva

Jäger

et al. 2008

SSP

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Several ternary Fe – Ge - C alloys with Ge contents ranging between 3 and 27 at. % have been studied. The structure, anelastic, thermodynamic and kinetic phenomena in Fe - 3, - 12, - 19/21 and – 27 Ge have been examined by X-ray diffraction (XRD), heat flow (DSC), vibrating sample magnetometry (VSM), optical-light and scanning electron microscopy, and internal friction (IF) methods. The Fe - 3Ge and Fe - 12Ge alloys form b.c.c. solid solutions. A Snoek-type internal friction (P1) peak is recorded in the Fe - 3Ge alloy with parameters similar to those for α-Fe: Н = 0.86 eV, Δ = 0.015, β = 0.72 and τ0 = 2 × 10-15 s, showing that Ge atoms have little influence on the diffusivity of carbon in iron. The Fe - 12Ge alloy, with a Curie point around 1008 K, has several IF peaks: a broad Snoek-type (P1 and P2), the P3 peak caused by structural changes in as quenched specimens during annealing, and a P4 (Zener) peak at higher temperature (Tm ≈ 773 K at f = 2 Hz, β ≈ 0.7). The Fe - 21Ge alloy has bcc or bcc plus hexagonal structure depending on heat treatment. The structure of the Fe3Ge-type alloy (Fe - 27Ge) consists mainly of hexagonal phases, i.e. hexagonal ε (D019), β (B81), and cubic ε′ (L12), and exhibits corresponding magnetic ordering transitions below 873 K which are not well-reflected in the common Fe - Ge phase diagrams. In particular a high stability of the hexagonal ε phase at room temperature is noted. A broad internal friction relaxation peak with Δ = 0.0036, H ≈ 1.8 eV and τ 0 = 2 ⋅ 10-17 s is found in Fe – 27 Ge and is classified as a double Zener peak in the ε and β two-phase mixture.

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“…At the same time, this systems (e.g. Fe-Ge alloys) may be used as a model system involving several phase transformations like structural ordering [1][2][3][4] and ferromagnetic transitions [5] as well as they are regarded as a model one for experimental and theoretical studies of the thermodynamic properties [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Properties of Dilute Fe-Ge Alloys Studied by the ⁵⁷Fe Mössbauer Spectroscopy

Konieczny

Chojcan

2018

Acta Phys. Pol. A

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The room temperature Mössbauer spectra of 57 Fe were measured for Fe-Ge containing approximately from 1 at.% till 5 at.% germanium. The spectra were analysed in terms of hyperfine parameters of their components related to unlike surroundings of the nuclear probes 57 Fe, determined by different numbers of germanium atoms existing in the neighbourhood of iron atoms. The intensity of the spectrum of components allowed to determine the short-range order, the binding energy E b between two germanium atoms in the studied systems using the extended Hrynkiewicz-Królas idea and the enthalpy of solution HFe−Ge of germanium in iron. It was found that the germanium atoms dissolved in iron matrix interact repulsively and the estimated value of HFe−Ge = −0.88(19) eV/atom. Moreover, the negative values of short-range order parameters α indicate ordering tendencies in annealed samples of Fe-Ge alloys. The results were compared with corresponding values given in the literature which were obtained from calorimetric experiments and the Miedema's model of alloys.

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Thermal stability and hyperfine interactions of mechanically alloyed Fe–Ge phases

Cited by 8 publications

References 13 publications

Structure and anelasticity of ordered and disordered Fe–Ge alloys

Structure and anelasticity of ordered and disordered Fe–Ge alloys

Structure and Anelasticity of Fe-Ge Alloys

Thermodynamic Properties of Dilute Fe-Ge Alloys Studied by the ⁵⁷Fe Mössbauer Spectroscopy

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Thermal stability and hyperfine interactions of mechanically alloyed Fe–Ge phases

Cited by 8 publications

References 13 publications

Structure and anelasticity of ordered and disordered Fe–Ge alloys

Structure and anelasticity of ordered and disordered Fe–Ge alloys

Structure and Anelasticity of Fe-Ge Alloys

Thermodynamic Properties of Dilute Fe-Ge Alloys Studied by the 57Fe Mössbauer Spectroscopy

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Product

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Thermodynamic Properties of Dilute Fe-Ge Alloys Studied by the ⁵⁷Fe Mössbauer Spectroscopy