Nuclear spectroscopy of nanocrystalline metals and alloys

Würschum, Roland

doi:10.1016/0965-9773(95)00033-x

Cited by 9 publications

(3 citation statements)

References 34 publications

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“…5 To understand the origin of the feature important for technical applications of these materials it is necessary to concentrate on their microstructure. 6 Structural properties of nanocrystalline alloys ͑size and form of the grains, homogeneity of the matrix͒ are studied by x-ray diffraction ͑XRD͒ and transmission electron microscopy ͑TEM͒ whereas magnetic measurements provide information about macroscopic magnetic properties ͑coercivity, magnetization, etc.͒. 7 The 57 Fe Mössbauer spectrometry can be effectively utilized in these investigations because of its local probe character: It enables us to reveal different types of hyperfine interactions a͒ Author to whom correspondence should be addressed; electronic mail: bruno@elf.stuba.sk via distributions of hyperfine fields as well as to give the crystalline-amorphous ratio and to provide information about interfacial regions.…”

Section: Introductionmentioning

confidence: 97%

Structure, hyperfine interactions, and magnetic behavior of amorphous and nanocrystalline Fe80M7B12Cu1 (M=Mo, Nb, Ti) alloys

Miglierini

Kopcewicz

Idzikowski

et al. 1999

Journal of Applied Physics

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Section: Introductionmentioning

confidence: 97%

Structure, hyperfine interactions, and magnetic behavior of amorphous and nanocrystalline Fe80M7B12Cu1 (M=Mo, Nb, Ti) alloys

Miglierini

Kopcewicz

Idzikowski

et al. 1999

Journal of Applied Physics

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“…In order to understand such a two-phase magnetic system, diverse methods of both structural and magnetic analysis are applied. Especially useful results are provided by microscopic techniques [5] that are able to track contributions from individual atoms. Among them, Mössbauer spectrometry plays a unique role, providing a chance to probe the structural arrangement and magnetic states of resonant atoms at the same time [6].…”

Section: Introductionmentioning

confidence: 99%

Structure and hyperfine interactions of melt-spun Fe₈₀Mo₇X₁B₁₂(X = Cu or Au) before and after transformation into nanocrystalline states

Miglierini

Tóth

Seberíni

et al. 2002

J. Phys.: Condens. Matter

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Mössbauer spectrometry ( 57 Fe transmission and conversion-electron techniques), differential scanning calorimetry, and x-ray diffraction are employed to study the microstructure and magnetism of amorphous and nanocrystalline Fe 80 Mo 7 X 1 B 12 (X = Cu, Au) alloys. Heat treatment of amorphous specimens below the temperature of primary crystallization causes structural relaxation that, in turn, stabilizes the amorphous arrangement. Changes observed in the topological short-range order are more pronounced for X = Au because this alloy shows a higher degree of disorder in the bulk of the as-quenched state. For both alloys, three-step crystallization behaviour is observed.Annealing performed in temperature range of the first crystallization provided different amounts of body-centred-cubic Fe nanograins. Magnetic interactions among them and their impact on the surrounding amorphous residual matrix are discussed using hyperfine-field distributions. Differences in hyperfine interactions between surface regions and bulk of the alloys are revealed from conversion-electron Mössbauer spectrometry and transmission Mössbauer effect measurements, respectively. The magnetic behaviours for X = Cu and Au are very similar after annealing at temperatures close to and beyond the end of the first crystallization peak. The impact of which element is present on the microstructure and magnetism is crucial during the commencement of the crystallization but it cannot be discerned for higher crystalline contents.

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“…As a result, nanocrystalline materials prepared by partial crystallization of metallic glasses stand in the centre of research activities both for scientific and technological reasons. To understand fully the origin of their unique properties, specific tools for structural and/or magnetic studies on an atomic scale, comprising nuclear probe methods, should be employed [5].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and hyperfine interactions of the nanocrystalline alloys: Mössbauer effect temperature measurements

Miglierini¹,

Škorvánek²,

Grenèche³

1998

J. Phys.: Condens. Matter

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Mössbauer spectrometry, magnetization measurements and differential scanning calorimetry were used to investigate the microstructure and hyperfine interactions in the nanocrystalline alloy obtained by heat treatment of the original amorphous precursor at the temperature of for 1 hour. transmission Mössbauer spectra were taken in the temperature range 5-475 K without and with external magnetic field oriented parallel and perpendicular to the ribbon-shaped sample. The as-quenched state of the alloy was also investigated. The Mössbauer effect measurements confirmed the presence of -Fe phase upon nanocrystallization. Magnetic states of Fe atoms in amorphous and interfacial regions are studied via distributions of hyperfine fields.

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Nuclear spectroscopy of nanocrystalline metals and alloys

Cited by 9 publications

References 34 publications

Structure, hyperfine interactions, and magnetic behavior of amorphous and nanocrystalline Fe80M7B12Cu1 (M=Mo, Nb, Ti) alloys

Structure, hyperfine interactions, and magnetic behavior of amorphous and nanocrystalline Fe80M7B12Cu1 (M=Mo, Nb, Ti) alloys

Structure and hyperfine interactions of melt-spun Fe₈₀Mo₇X₁B₁₂(X = Cu or Au) before and after transformation into nanocrystalline states

Microstructure and hyperfine interactions of the nanocrystalline alloys: Mössbauer effect temperature measurements

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Nuclear spectroscopy of nanocrystalline metals and alloys

Cited by 9 publications

References 34 publications

Structure, hyperfine interactions, and magnetic behavior of amorphous and nanocrystalline Fe80M7B12Cu1 (M=Mo, Nb, Ti) alloys

Structure, hyperfine interactions, and magnetic behavior of amorphous and nanocrystalline Fe80M7B12Cu1 (M=Mo, Nb, Ti) alloys

Structure and hyperfine interactions of melt-spun Fe80Mo7X1B12(X = Cu or Au) before and after transformation into nanocrystalline states

Microstructure and hyperfine interactions of the nanocrystalline alloys: Mössbauer effect temperature measurements

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Structure and hyperfine interactions of melt-spun Fe₈₀Mo₇X₁B₁₂(X = Cu or Au) before and after transformation into nanocrystalline states