Site-specific long-range order in<sup>57</sup>Fe<sub>3</sub>Al measured by Mössbauer diffractometry

Lin, Jiao; Fultz, B.

doi:10.1080/0141861031000111138

Cited by 3 publications

(6 citation statements)

References 15 publications

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“…The prior analysis of these data [10] showed a significant discrepancy between the measured and calculated simple-cubic long-range order parameter for 57 Fe atoms in the (3) Al 1nn environment. With further Monte-Carlo simulations and transmission electron microscopy study of the alloy structure, explored in the present work, it was possible to show that the discrepancy between the calculated and measured chemical environments likely originates with a non-random point defect population at antiphase domain boundaries in the crystals.…”

Section: Introductionmentioning

confidence: 90%

“…The Mössbauer powder diffractometer consisted of a Bruker X-1000 Xe-filled area detector, a GE XRD-5 goniometer, a 57 Co (Rh) radioactive source, a Wissel Doppler drive system with laser interferometer velocity calibrator, and a control computer. This instrument was described recently [8,10,18]. All Mössbauer diffraction patterns were normalized to incident flux, with units of counts/sr/(mCi Á hour).…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…where F Al ðeÞ and F ðnÞ ðeÞ denote the scattering factors for Al atoms and Fe atoms with ðnÞ Al 1nn, respectively, and vary with the Doppler shift energy, e. The intensities of the fundamental diffraction peaks do not depend on the long-range chemical order (LRO) on the bcc lattice, but they do depend on the short-range order (SRO) of the local chemical environments of 57 Fe because the energy spectrum (intensity versus e) of the nuclear scattering amplitude, F ðnÞ ðeÞ, depends on SRO. Expressions for the form factor for nuclear resonant scattering, including polarization effects, F ðnÞ ðeÞ, were given previously [10]. Analysis of the energy spectra of the bcc fundamental diffractions gave probabilities for 57 Fe atoms having different numbers, n, of Al atoms in their 1nn shells (see Table 1).…”

Section: Measured Mössbauer Diffraction Intensitiesmentioning

confidence: 99%

“…With this chemical selectivity, the spatial periodicities of 57 Fe atoms in different chemical environments can be determined from the energydependence of the nuclear Bragg diffractions. The measurements are enabled by developments in both the theory and practice of Mössbauer powder diffractometry, many of which occurred in the past decade [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…The first direct measurements of spatial periodicities of defect environments in a material were performed recently [10]. Mössbauer diffraction patterns were measured over the full Mössbauer energy spectrum of an alloy of 57 Fe 3 Al, making it possible to quantify the unknown spatial periodicity of 57 Fe atoms with (3) and (5) Al 1nn atoms.…”

Section: Introductionmentioning

confidence: 99%

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Spatial periodicities of defect environments in ⁵⁷Fe₃Al studied by Mössbauer powder diffractometry

Lin¹,

Fultz²

2004

Zeitschrift Für Kristallographie - Crystalline Materials

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Section: Introductionmentioning

confidence: 90%

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Section: Measured Mössbauer Diffraction Intensitiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Spatial periodicities of defect environments in ⁵⁷Fe₃Al studied by Mössbauer powder diffractometry

Lin¹,

Fultz²

2004

Zeitschrift Für Kristallographie - Crystalline Materials

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Mössbauer Spectrometry

Fultz¹

2012

Characterization of Materials

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Mössbauer spectrometry gives electronic, magnetic, and structural information from within materials. A Mössbauer spectrum is an intensity of γ-ray absorption versus energy for a specific resonant nucleus such as 57 Fe or 119 Sn. For one nucleus to emit a γ-ray and a second nucleus to absorb it with efficiency, both nuclei must be embedded in solids, a phenomenon known as the "Mössbauer effect." Mössbauer spectrometry looks at materials from the "inside out," where "inside" refers to the resonant nucleus.Mössbauer spectra give quantitative information on "hyperfine interactions," which are small energies from the interaction between the nucleus and its neighboring electrons. The three hyperfine interactions originate from the electron density at the nucleus (the isomer shift), the gradient of the electric field (the nuclear quadrupole splitting), and the unpaired electron density at the nucleus (the hyperfine magnetic field). Over the years, methods have been refined for using these three hyperfine interactions to determine valence and spin at the resonant atom. Even when the hyperfine interactions are not easily interpreted, they can often be used reliably as "fingerprints" to identify the different local chemical environments of the resonant atom, usually with a good estimate of their fractional abundances. Mössbauer spectrometry is useful for quantitative phase analyses or determinations of the concentrations of resonant element in different phases, even when the phases are nanostructured or amorphous.Most Mössbauer spectra are acquired with simple laboratory equipment and a radioisotope source, but the recent development of synchrotron instrumentation now allow for measurements on small 10 µm samples, which may be exposed to extreme environments of pressure and temperature. Other capabilities include measurements of the vibrational spectra of the resonant atoms, and coherent scattering and diffraction of nuclear radiation. This article is not a review of the field, but an instructional reference that explains principles and practices, and gives the working materials scientist a basis for evaluating whether or not Mössbauer spectrometry may be useful for a research problem. A few representative materials studies are presented.

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Mössbauer studies of complex materials: Energy versus time domain

Planckaert

Callens

Demeter

et al. 2009

Applied Physics Letters

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We present a critical comparison between conventional Mössbauer spectroscopy on the one hand and energy and time resolved nuclear resonant scattering on the other hand. The three Mössbauer techniques are evaluated by the characterization of the complex magnetic structure of an Fe3Al alloy. It is shown how the different scattering processes and detection schemes, which are involved in the respective configurations, determine the specific strengths of the three techniques and how they are optimally suited for the characterization of materials of varying complexity and reduced sizes.

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Site-specific long-range order in⁵⁷Fe₃Al measured by Mössbauer diffractometry

Cited by 3 publications

References 15 publications

Spatial periodicities of defect environments in ⁵⁷Fe₃Al studied by Mössbauer powder diffractometry

Spatial periodicities of defect environments in ⁵⁷Fe₃Al studied by Mössbauer powder diffractometry

Mössbauer Spectrometry

Mössbauer studies of complex materials: Energy versus time domain

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Site-specific long-range order in57Fe3Al measured by Mössbauer diffractometry

Cited by 3 publications

References 15 publications

Spatial periodicities of defect environments in 57Fe3Al studied by Mössbauer powder diffractometry

Spatial periodicities of defect environments in 57Fe3Al studied by Mössbauer powder diffractometry

Mössbauer Spectrometry

Mössbauer studies of complex materials: Energy versus time domain

Contact Info

Product

Resources

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Site-specific long-range order in⁵⁷Fe₃Al measured by Mössbauer diffractometry

Spatial periodicities of defect environments in ⁵⁷Fe₃Al studied by Mössbauer powder diffractometry

Spatial periodicities of defect environments in ⁵⁷Fe₃Al studied by Mössbauer powder diffractometry