Magneto-volume effects of γ-Fe precipitates in Cu and CuAl matrices

Ezawa, T.; Macedo, W. A. A.; Glos, U.; Keune, W.; Schletz, K. P.; Kirschbaum, U.

doi:10.1016/0921-4526(89)90149-x

Cited by 28 publications

(7 citation statements)

References 10 publications

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“…When we consider the magnetism of the deformed clusters, we are reminded of the ␥-Fe precipitates in Cu. Mössbauer spectroscopy data reported by Ezawa et al 19 show that ␥-Fe precipitates in small sizes, which are retained in the cubic lattice and have a spiral spin structure, 20 have a rather small hyperfine field ͑ϳ1.6 T͒ and low Néel temperature ͑ϳ40 K͒. However, the ␥-Fe precipitates grown up to larger sizes, which undergo a structural phase transition to the state with the lattice deformation described by the ͗110͘ ͗1 −1 0͘ shear wave, show a different magnetic structure with roughly twice the hyperfine field and twice the Néel temperature ͑ϳ3 T and ϳ70 K͒ as those in the cubic state.…”

Section: Summary and Discussionmentioning

confidence: 78%

Elastic diffuse scattering of neutrons in FeNi Invar alloys

et al. 2008

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Elastic diffuse scattering of neutrons was found around various Bragg-peak positions in FeNi Invar alloys. The diffuse scattering intensities depend on the temperature and Ni concentration. The intensities increase with decreasing temperature and decrease with increasing Ni concentration. The distribution of diffuse scattering intensity changes from peak to peak and is well explained by the formation of clusters with a lattice deformation consisting of a shear wave propagating along the ͗1 1 0͘ direction and with the ͗1 −1 0͘ polarization vector. The ranges of temperature and Ni concentration, for which diffuse scattering is observed, coincide with those for which the Invar anomalies are observable. The origin of the clusters together with the lattice deformation and their role with regard to the Invar effects are discussed as well as the possibility of a precursor for the fcc-bcc martensitic transformation observed in FeNi alloys.

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Section: Summary and Discussionmentioning

confidence: 78%

Elastic diffuse scattering of neutrons in FeNi Invar alloys

et al. 2008

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“…Ezawa et al [12]. For small precipitates (d < 20 nm), the Néel temperature determined by Mössbauer spectroscopy decreases with decreasing particle size and shows an intermediate value between neutron and susceptibility data.…”

Section: Susceptibilitymentioning

confidence: 97%

The particle size effect of the spin-density wave in cubic γ-Fe precipitates in Cu

Naono¹,

Tsunoda²

2004

J. Phys.: Condens. Matter

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It is common knowledge that the magnetic structure of fcc Fe (γ-Fe) can be described by means of an incommensurate spin-density wave (SDW). Previous experimental data, however, were mostly obtained for γ-FeCo alloy precipitates in Cu in order to avoid the complexity of the structural phase transition. Since Fe is a fundamental element, reliable data on the SDW state for pure γ-Fe are highly desired. We present here neutron scattering data for the SDW in pure γ-Fe precipitates in Cu and discuss the particle size effect of the SDW.

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“…Such samples are obtained by aging a metastable solid iron solution in copper at temperatures 300-600 1C[2,[15][16][17][18][19]. Another important research direction is a study of the phase formation during mechanical alloying of elemental Fe and Cu powders.Fe and Cu possess high positive enthalpy of intermixing in the equilibrium state; however, during mechanical alloying the formation of metastable solid solutions is observed.…”

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confidence: 99%