Pressure-Induced Invar Effect in Fe-Ni Alloys

Dubrovinsky, Leonid; Dubrovinskaia, Natalia; Abrikosov, I. A.; Vennström, Marie; Westman, F.; Carlson, Stefan; Schilfgaarde, Mark van; Johansson, Börje

doi:10.1103/physrevlett.86.4851

Cited by 83 publications

(87 citation statements)

References 10 publications

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“…In material synthesis, pressure adds a new dimension in creating exotic alloys and properties [615][616][617][618][619]. The formation of extended solids (polymers) is a common observation under HP, e.g., polymeric cg-N [587,620].…”

Section: High Pressure Chemistrymentioning

confidence: 99%

High-pressure studies with x-rays using diamond anvil cells

2016

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Pressure profoundly alters all states of matter. The symbiotic development of ultrahighpressure diamond anvil cells, to compress samples to sustainable multi-megabar pressures; and synchrotron x-ray techniques, to probe materials' properties in situ, has enabled the exploration of rich high-pressure (HP) science. In this article, we first introduce the essential concept of diamond anvil cell technology, together with recent developments and its integration with other extreme environments. We then provide an overview of the latest developments in HP synchrotron techniques, their applications, and current problems, followed by a discussion of HP scientific studies using x-rays in the key multidisciplinary fields. These HP studies include: HP x-ray emission spectroscopy, which provides information on the filled electronic states of HP samples; HP x-ray Raman spectroscopy, which probes the HP chemical bonding changes of light elements; HP electronic inelastic x-ray scattering spectroscopy, which accesses high energy electronic phenomena, including electronic band structure, Fermi surface, excitons, plasmons, and their dispersions; HP resonant inelastic x-ray scattering spectroscopy, which probes shallow core excitations, multiplet structures, and spin-resolved electronic structure; HP nuclear resonant x-ray spectroscopy, which provides phonon densities of state and time-resolved Mössbauer information; HP x-ray imaging, which provides information on hierarchical structures, dynamic processes, and internal strains; HP x-ray diffraction, which determines the fundamental structures and densities of single-crystal, polycrystalline, nanocrystalline, and non-crystalline materials; and HP radial x-ray diffraction, which yields deviatoric, elastic and rheological information. Integrating these tools with hydrostatic or uniaxial pressure media, laser and resistive heating, and cryogenic cooling, has enabled investigations of the structural, vibrational, electronic, and magnetic properties of materials over a wide range of pressure-temperature conditions.

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Section: High Pressure Chemistrymentioning

confidence: 99%

High-pressure studies with x-rays using diamond anvil cells

2016

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“…3 These phenomena are only found by either using extreme conditions (such as high-pressure techniques 4 ) or new synthesis routes [such as mechanical alloying (MA)]. As is well known, the stable state of Fe at room temperature and atmospheric pressure has a bcc crystal structure with a lattice parameter a of about 2.87 Å, the so-called ␣-Fe phase.…”

Section: Introductionmentioning

confidence: 99%

Invar effect in fcc-FeCusolid solutions

et al. 2004

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Both Cu and Fe metals, with face-centered cubic (fcc) crystal structures, are nonmagnetic. However, the substitution of Cu atoms by Fe in the fcc-Cu lattice leads to the formation of a random solid solution and the appearance of ferromagnetic order, with a value of the magnetic moment per Fe atom in a fcc environment even above 2 B . This striking behavior is closely related to magnetovolume effects (Invar), which we have detected by means of lattice thermal expansion and magnetization measurements in FeCu alloys.

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“…[29][30][31][32] It has been observed the interdependence of the latter two variables in Ni-rich Fe-Ni compositions, where LS noncollinear magnetic ordering can be induced under pressure, giving rise to invar behavior. 33 In a previous work, we shown that the magnitude of the Curie temperature, T C , of an standard commercial Fe 64 Ni 36 powder sample can be increased in ⌬T C ϳ70 K, by means of a severe mechanical processing, using a high-energy ball mill, followed by a heating up to 1073 K, while the invar character is maintained and its temperature range enlarged as well. 34 Previously, Dumpich et al 35 already observed in "asprepared" Fe 65 Ni 35 evaporated thin films an increase in the T C value of ca 200 K, accompanied by an enhancement of 20% in the saturation magnetization, M s .…”

Section: Introductionmentioning

confidence: 99%

Stress-induced large Curie temperature enhancement inFe64Ni36Invar alloy

et al. 2009

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We have succeeded in increasing up to 150 K the Curie temperature in the Fe 64 Ni 36 invar alloy by means of a severe mechanical treatment followed by a heating up to 1073 K. The invar behavior is still present as revealed by the combination of magnetic measurements with neutron and x-ray techniques under extreme conditions, such as high temperature and high pressure. The proposed explanation is based in a selective induced microstrain around the Fe atoms, which causes a slight increase in the Fe-Fe interatomic distances, thus reinforcing ferromagnetic interactions due to the strong magnetoelastic coupling in these invar compounds.

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Pressure-Induced Invar Effect in Fe-Ni Alloys

Cited by 83 publications

References 10 publications

High-pressure studies with x-rays using diamond anvil cells

High-pressure studies with x-rays using diamond anvil cells

Invar effect in fcc-FeCusolid solutions

Stress-induced large Curie temperature enhancement inFe64Ni36Invar alloy

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