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  • 1985-1989  (11)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Low-field magnetic hysteresis in gadolinium and terbium (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 471-475 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Fourier components of the ferromagnetic hysteresis of polycrystalline gadolinium and terbium have been measured in low ac magnetic fields (0.1–15 A m−1) using synchronous detection. The field dependences and magnitudes of the various harmonics cannot be described by the Rayleigh hysteresis law. It is shown that the dominant term in the absorptive component of the first harmonic is associated with a magnetic aftereffect. At the lowest fields (H(approximately-less-than)1 A m−1) there are indications that magnetic hysteresis vanishes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334775
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Iron precipitation in Cu-Au-Fe alloys (1988)
    Springer
    Journal of materials science 23 (1988), S. 3480-3484 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Interest is focused on the segregation and clustering behaviour of iron atoms in fcc Cu100−x−yAuxFey, alloys (x=6 to 50.7 at%, y=0.2 to 1.0 at%) of three different metallurgical states: as-rolled, fast-quenched and melt-spun. The gold concentration was varied to assess the effect of change in lattice parameter. Mössbauer spectroscopy has been used to examine iron clusters and phases in samples as functions of annealing temperature and time. The development of f c c γ-Fe, segregates with increasing annealing time at temperatures around 410° C has been monitored and the Néel temperature of the antiferromagnetic γ-Fe precipitates as well as their particle size determined, the latter by transmission electron microscopy. The increase in isomer shift with increasing gold concentration is accounted for mainly by changes in atomic volume.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00540482
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A Mössbauer study of rapidly quenchedCuFe alloys — Antiferromagnetic γ-Fe (1986)
    Springer
    Hyperfine interactions 28 (1986), S. 993-996 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A series ofCuFe alloys containing 5, 10 and 16 at% Fe has been prepared using standard ribbon spinning techniques. It is found that samples containing significant fractions (∼ 5%) of Fe in the form of r-Fe can be obtained readily on quenching from the (r + liquid) phase, applied field spectra (0–5.2 T) on antiferromagnetic r-Fe at 4. 2 K indicate that the anisotropy energy is small and that spins tilt from the minimum energy configuration (spin axes perpendicular to Bappl) for Bappl ≥ 2.5T.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02061611
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Evolution of spin clusters from the spin glass region inAuFe (1986)
    Springer
    Hyperfine interactions 28 (1986), S. 989-991 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Zero field Mössbauer spectra (4.2–40 K) have been obtained onAuFe alloys containing 5 and 10 at %Fe in differing metallurgical states. Graphs of the reduced magnetic hyperfine field versus reduced temperature have been compared With Brillouin curves. This comparison shows that the heat treated 5 at %Fe sample is essentially a homogeneous spin glass whereas the behaviour of the heat treated 10 at %Fe sample and alloys in an as rolled (atomically clustered) state can be better described by the additional presence of magnetic clusters of spins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02061610
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Hydrogenation of Zr2Ni (1986)
    Springer
    Hyperfine interactions 28 (1986), S. 997-1000 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The intermetallic compound Zr2Ni has been found to take up hydrogen on charging at room temperature. Zr2(NiFe) H4.7 and Zr2(NiFe) H4.5 show the same structure (CuAl2 type) as the uncharged compound but with an expanded lattice. Analysis of room temperature spectra in zero and applied fields indicates that the57Fe atoms occupy Ni sites in Zr2(Ni 57Fe). Volume expansion effects account for about one third of the increase in isomer shift (∼ +0.58 mms−1) observed on hydrogenation. The distribution of hydrogen atoms around the probe37Fe atoms also causes a decrease of ∼0.23 mms−1 in the mean value for the quadrupole splitting compared Rith uncharged Zr2Ni.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02061612
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Investigation of Zr3Fe hydride phases (1988)
    Springer
    Hyperfine interactions 41 (1988), S. 543-546 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Detailed Mössbauer studies of a series of hydrogenated Zr3Fe samples have demonstrated the existence of several hydride phases with hydrogen concentration up to Zr3FeH8. Despite the overall similarity of the spectra, assessment of their parameters has identified separate groupings, each linked with a particular phase. At low temperatures magnetic ordering is observed for Zr3FeH5.3 and Zr3FeH6.9.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02400448
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic behaviour ofCuAuFe alloys (1988)
    Springer
    Hyperfine interactions 40 (1988), S. 385-388 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The magnetic properties of Cu99-xAuxFe1 alloys (x=12, 37 and 50.7 ats) have been investigated over the temperature range ∼4.2–70 K using low field AC magnetic susceptibility measurements and mössbauer spectroscopy. All alloys exhibit spin glass behaviour at low temperature with freezing temperatures Tf∼-5.7–7.6 K. Results of analysis of the high temperature (T≳3 Tf) Curie-Weiss behaviour are compared with those obtained from analysis of the broadly distributed 4.2 K Mössbauer spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02049123
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Intermetallic phases of the Hf−Fe system (1988)
    Springer
    Hyperfine interactions 41 (1988), S. 547-550 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An assessment of the phases present in the Hf−Fe system agress well with the phase diagram and yields parameters in general agreement with previous Mössbauer studies. The Hf2Fe phase exhibits a quadrupole split spectrum whereas the HfFe2 compound shows magnetic hyperfine splitting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02400449
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Segregation of iron inCuAuFe alloys (1988)
    Springer
    Hyperfine interactions 41 (1988), S. 571-574 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract TheCuAuFe system has been studied by room temperature Mössbauer spectroscopy in order to examine the influence of varying both iron (Cu94−yAu6Fey; y=0.2–1.0 at%) and gold (Cu99−xAuxFe1; x=6–50.7 at%) concentrations on the clustering of iron atoms. Samples were examined in different metallurgical states, as rolled, fast quenched and melt spun with similar degrees of clustering being observed. The isomer shift is found to vary inversely with atomic volume for the Cu99−xAuxFe1 alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02400455
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    γ-Fe precipitation in melt-spunCuFe (1988)
    Springer
    Hyperfine interactions 41 (1988), S. 567-570 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ribbon spinning method has been used to prepare samples containing enhanced fractions (∼ 3–6 at%) of iron precipitates in the fcc γ-phase fromCuFe alloys containing 5, 10 and 16 at% Fe. Details of the procedure, heat treatments and data analysis are presented. The behaviour of the intensity ratio parameter in applied field spectra (0–5.2 T) obtained below the antiferromagnetic ordering temperature of γ-Fe is also examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02400454
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    Paper (German National Licenses)
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