Mössbauer study of atomic order in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ni</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Fe. I. Determination of the long-range-order parameter

Drijver, J. W.; Vanderwoude, F

doi:10.1103/physrevb.16.985

Cited by 66 publications

(16 citation statements)

References 30 publications

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“…The small intensity doublet in Figure 4 (Table I) can indicate the presence of the ferrihydrite which can occur in Ni rich Fe-Ni system [22]. Similar component was also observed with fine particle (20 nm) evaporated Ni-Fe alloys [20].…”

Section: Methodssupporting

confidence: 57%

“…Figure 3 shows the X-ray diffractogram of the pulse plated Fe-Ni layer, deposited with same pulse parameters as used for Fe-P group 1. The relative broad peaks besides the narrow reflections of Cu substrate can be well identified as the pattern of disordered solid (Table I) correspond to those of Ni-Fe alloys [20,21]. The spectrum can be understood as a Ni-22 wt.% Fe solid solution by decomposition of the spectrum into sextets taking into consideration the polarization effect of the Ni neighbors [20], located in the different coordination spheres of iron, on the iron, in agreement with the 78 wt.% Ni content determined by chemical analysis.…”

Section: Methodsmentioning

confidence: 97%

“…The relative broad peaks besides the narrow reflections of Cu substrate can be well identified as the pattern of disordered solid (Table I) correspond to those of Ni-Fe alloys [20,21]. The spectrum can be understood as a Ni-22 wt.% Fe solid solution by decomposition of the spectrum into sextets taking into consideration the polarization effect of the Ni neighbors [20], located in the different coordination spheres of iron, on the iron, in agreement with the 78 wt.% Ni content determined by chemical analysis. Consequently, the Mössbauer spectroscopy together with the XRD reveal that a highly disordered microcrystalline solid solution Ni-Fe layer was successfully prepared by the pulse plating electrochemical route.…”

Section: Methodsmentioning

confidence: 97%

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Mössbauer and XRD study of pulse plated Fe–P and Fe–Ni thin layers

et al. 2005

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57 Fe conversion electron Mössbauer spectroscopy, X-ray diffraction, electrochemical and magnetic measurements were used to study pulse electroplated Fe-P and NiFe coatings. XRD and 57 Fe CEMS measurements revealed the amorphous character of the novel pulse plated Fe-P alloys. CEM spectra indicated significant differences in the short range order and in the magnetic anisotropy between the Fe-P deposits pulse plated at medium long deposition time (t on =2 ms), with short relaxation time (t off =9 ms) and low current density (I p =0.05 Acm −2 ) or at short deposition time (t on =1 ms) with long relaxation time (t off =250 ms) and high current density (I p =1.0 Acm −2 ). The broad peaks centred around the fcc reflections in XRD of the pulse plated Ni-22 wt.% Fe deposit reflected a microcrystalline Ni-Fe alloy with a very fine, 5-8 nm, grain size. The CEM spectrum of the pulse plated Ni-22 wt.% Fe coating corresponded to a highly disordered solid solution alloy containing a minute amount of ferrihydrite. Extreme favourable soft magnetic properties were observed with these Ni-Fe and Fe-P pulse plated thin layers.

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Section: Methodssupporting

confidence: 57%

Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 97%

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Mössbauer and XRD study of pulse plated Fe–P and Fe–Ni thin layers

et al. 2005

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“…The use of Mössbauer spectroscopy is limited to those few alloys where at least one of the constituents is a Mössbauer-active isotope. This spectroscopy is complimentary but does not compete with diffuse scattering measurements as a direct method for obtaining detailed information about nearneighbor chemical environments and bond distances (Drijver et al, 1977;Pierron-Bohnes et al, 1983).…”

Section: Competitive and Related Techniquesmentioning

confidence: 99%

X‐Ray and Neutron Diffuse Scattering Measurements

Ice¹,

Robertson²,

Sparks³

2002

Characterization of Materials

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Diffuse scattering from crystalline solid solutions is used to measure local compositional order among the atoms, dynamic displacements (phonons), and mean species‐dependent static displacements. In locally ordered alloys, fluctuations of composition and interatomic distances break the long‐range symmetry of the crystal within local regions and contribute to the total energy of the alloy. Local ordering can be a precursor to a lower temperature equilibrium structure that may be unattainable because of slow atomic diffusion. In addition to local atomic correlations, neutron diffuse scattering methods can be used to study the local short‐range correlations of the magnetic moments. Interstitial defects, as opposed to the substitutional disorder defects described above, also disrupt the long‐range periodicity of a crystalline material and give rise to diffusely scattered x rays, neutrons, and electrons. This article will concentrate on the use of diffuse x‐ray and neutron scattering from single crystals to measure local chemical correlations and chemically specific static displacements. Particular emphasis is placed on the use of resonant (anomalous) x‐ray techniques to extract information on atomic size from binary solid solutions with short‐range order. Here the alloys have a well‐defined average lattice but have local fluctuations in composition and displacements from the average lattice. In stoichiometric crystals with long‐range periodicity, sharp superlattice Bragg reflections appear. If the compositional order is correlated only over short distances, the superlattice reflections are so broadened that measurements throughout a symmetry related volume in reciprocal space are required to determine its distribution. In addition, the displacement of the atom pairs (e.g., the A‐A, A‐B, and B‐B pairs in a binary alloy) from the sites of the average lattice because of different atom sizes also contributes to the distribution of this diffuse scattering. By separating this diffuse intensity into its component parts—that associated with the chemical preference for A‐A, A‐B, and B‐B pairs for the various near‐neighbor shells and that associated with the static and dynamic displacements of the atoms from the sites of the average lattice—we are able to recover pair correlation probabilities for the three kinds of pairs in a binary alloy. The interpretation of diffuse scattering associated with dynamic displacements of atoms from their average crystal sites are discussed only briefly in this article.

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“…In this method, neither single crystals nor very fine powders are required. Drijver et al (16) reported an attempt to determine the long-range-order parameters for Ni3Fe, and Chang et al (13) for Fe3Al using the 57Fe Mossbauer spectroscopy.…”

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confidence: 99%

Determination of Long-Range-Order Parameter of Fe<SUB>3</SUB>Si Alloy by means of <SUP>57</SUP>Fe Mössbauer Effect

1985

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A site population analysis of iron atoms in Fe3Si alloys with D03 superlattice structure was performed by 57Fe Mossbauer spectroscopy using crushed and annealed powder specimens with silicon concentrations of 23.3 and 25.5 at%. The Mossbauer spectra obtained were found to be superpositions of at least three six-line components. The relative intensity for each component has been analyzed using the thin foil approximation. The atomic configuration and the relative number of iron atoms of the component were determined from the values of the hyperfine field and the relative intensity for each component, and from these data the short-range-order parameter was determined.In order to determine the long-range-order parameters of the alloys, a two step procedure was used: First, the perfectly ordered D03 lattice of 25 at% Si was constructed by computer, and then atoms were replaced randomly so that any desired values of the alloy concentration and the degree of order are reached. By comparing the computer simulation with the result of the Mossbauer experiment, the long-rangeorder parameters, S(D03) and S(B2), were determined. The values agree well with those obtained by the powder X-ray diffraction technique. (Received June 12, 1985) Keywords: Mossbauer spectroscopy, site population, atomic configuration, hyperfine field order-disorder transformation, iron-silicon alloys, DO3 lattice, B2 lattice, long-range-order Parameter. short-range-order parameterAs shown in the equilibrium phase diagram, the Fe-Si alloy near room temperature has a disordered structure (bcc) when the silicon concentration is less than 10 at%, the B2 structure for 10-20 at% Si and the D03 structure for 12-25 at% Si. Especially in the composition region of 12-24 at% Si, the temperature change induces a phase transformation among D03, B2 and bccc(1).57Fe Mossbauer spectra of ferromagnetic materials show the nuclear Zeeman splitting which is caused by the hyperfine field at the nucleus. In many ferromagnetic iron alloys, the electronic state of 57Fe and the hyperfine field at 57Fe nucleus mainly depend on the surrounding atomic configuration; this is the so called local environment effect. Fe3Si and Fe3Al are typical examples of compounds which show a large local environment effect. Many 57Fe Mossbauer spectroscopic studies (besides a great number of results obtained by other methods) have been reported on these alloy systems to investigate the site populations in ordered and disordered states of these alloy systems(2)- (15) .Information which can be obtained directly from Mossbauer spectra in this alloy system depends mainly on the short-range atomic configurations. However, if it is possible to determine long-range-order parameters by Mossbauer spectra, this method is very useful to gain information on order-disorder transformations which is usually obtained from other methods such as X-ray diffraction, because data on short-range and on long-range order can be obtained at the same time. In this method, neither single crystals nor very fine powders ...

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Mössbauer study of atomic order inNi3Fe. I. Determination of the long-range-order parameter

Cited by 66 publications

References 30 publications

Mössbauer and XRD study of pulse plated Fe–P and Fe–Ni thin layers

Mössbauer and XRD study of pulse plated Fe–P and Fe–Ni thin layers

X‐Ray and Neutron Diffuse Scattering Measurements

Determination of Long-Range-Order Parameter of Fe<SUB>3</SUB>Si Alloy by means of <SUP>57</SUP>Fe Mössbauer Effect

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Mössbauer study of atomic order inNi3Fe. I. Determination of the long-range-order parameter

Cited by 66 publications

References 30 publications

Mössbauer and XRD study of pulse plated Fe–P and Fe–Ni thin layers

Mössbauer and XRD study of pulse plated Fe–P and Fe–Ni thin layers

X‐Ray and Neutron Diffuse Scattering Measurements

Determination of Long-Range-Order Parameter of Fe<SUB>3</SUB>Si Alloy by means of <SUP>57</SUP>Fe M&ouml;ssbauer Effect

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Determination of Long-Range-Order Parameter of Fe<SUB>3</SUB>Si Alloy by means of <SUP>57</SUP>Fe Mössbauer Effect