Magnetic properties and structural chemistry of the solid solution La5B2C6–Gd5B2C6

Bidaud, E.; Hiebl, K.; Bauer, Josef; Rogl, P.

doi:10.1016/s0925-8388(97)00501-x

Cited by 10 publications

(1 citation statement)

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“…Magnetic behaviour of Fe-rich FeAl alloys also readily changes with changes in their structural composition. This change is very prominent and easily observable for even very small mechanical deformation on ordered alloy [22][23][24][25][26][27][28][29][30] making it easy to undergo order-disorder transitions. It is recorded that, a solid solution structure is induced with a simple milling and the lattice parameter increases by 1% in some compositions of alloys and within no time variation, magnetic behaviour exhibits this change, for example, a few ordered samples show a paramagnetic nature, but on being milled they become ferromagnetic.…”

Section: Introductionmentioning

confidence: 99%

Mössbauer and magnetization studies of mechanically milled nanocrystalline Fe_1–_xAl_x alloys

et al. 2015

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Changes in the magnetic behavior of Fe 1-x Al x (x = 0.3, 0.4, 0.5, 0.6) powders during mechanical alloying have been studied. The ball milling process leads to formation of solid state reaction assisted by severe plastic deformation because of which crystallite size is reduced and as a result of which interesting magnetic properties are developed. The evolution of magnetic order in high-energy ball-milled Fe-Al solid solution is investigated using 57 Fe Mössbauer spectroscopy and vibrating sample magnetometer. Mössbauer spectra and the hyperfine field distributions of all the samples show the presence of both magnetic and paramagnetic components in the samples. The corresponding bulk magnetization studies also show that the Al rich samples are also ferromagnetic, which can be attributed to the presence of disordered Fe-rich phases due to the nonequilibrium process of alloying. In Fe-rich samples, the formation of an off stoichiometric Fe 3 Al phase is favored while in the case of Al-rich samples both Al-rich phases and clustering of Fe and Al atoms are present. The systematic variation in the magnetic properties has been qualitatively correlated with the evolution of microstructure, reduction in grain size (obtained using transmission electron microscopy) and enhanced intergranular exchange coupling. PACS Nos.: 81.20.Ev, 81.07.Bc, 75.75.-c. Résumé : Nous identifions les changement de comportement magnétique dans des poudres de Fe 1-x Al x (x = 0.3, 0.4, 0.5, 0.6) pendant un procédé d'alliage mécanique. L'utilisation du moulin à billes permet des réactions à l'état solide assistées de fortes déformations plastiques causant la diminution de la taille cristalline et menant au développement d'intéressantes propriétés magnétiques. Par spectroscopie Mössbauer et magnétométrie à échantillon vibrant, nous étudions l'évolution magnétique de la solution Fe-Al dans un moulin à billes de haute énergie. Les spectres Mössbauer et les distributions de champ hyperfin de tous les échantillons montrent des composantes magnétiques et paramagnétiques. Les études correspondantes de magnétisation en volume montrent que les échantillons riches en Al présentent un ferromagnétisme qui peut être attribué à des phases désor-données riches en Fe dues à des processus de formation d'alliage hors d'équilibre. Dans les échantillons riches en Fe, la formation d'une phase Fe 3 Al non stoechiométrique est favorisée, alors que dans les échantillons riches en Al, on retrouve des phases riches en Al, ainsi que de l'agrégation d'atomes de Fe et de Al. Nous réussissons qualitativement à corréler la variation systématique des propriétés magnétiques avec l'évolution des microstructures, la réduction de la taille des grains (obtenue par microscopie électronique en transmission) et le couplage d'échange accru entre granules. [Traduit par la Rédaction]

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Section: Introductionmentioning

confidence: 99%

Mössbauer and magnetization studies of mechanically milled nanocrystalline Fe_1–_xAl_x alloys

et al. 2015

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ChemInform Abstract: Magnetic Properties and Structural Chemistry of the Solid Solution La₅B₂C₆—Gd₅B₂C₆.

et al. 1998

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1998 electric properties, superconductors, semiconductors electric properties, superconductors, semiconductors D 8000 -008Magnetic Properties and Structural Chemistry of the Solid Solution La 5 B 2 C 6 -Gd 5 B 2 C 6 . -The borocarbides (La 1−x Gdx) 5 B 2 C 6 (0 ≤ x ≤ 1) are prepared by arc melting from the elements and all show structure types isostructural to Ce 5 B 2 C 6 determined by powder XRD. La 5 B 2 C 6 is a type I superconductor with T ¡ 6.9 K but superconductivity is easily destroyed either by applying low external fields or by replacing La by paramagnetic Gd. Within the solid solution the ordering temperature decreases gradually with increasing x. The positive Op values suggest that the spin structure contains ferromagnetic sheets which are antiferromagnetically coupled. For x ¡ 4.2 K. -(BIDAUD, E.; HIEBL, K.; BAUER, J.; ROGL, P.; J.

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Kristall‐ und Realstrukturuntersuchungen zur wiederkehrenden Supraleitung in “La₅B₂C₆”

Simon

Babizhetskyy

Mattausch

et al. 2005

Zeitschrift anorg allge chemie

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Die Phase “La5B2C6” wird in der Literatur als bei 6.9 K supraleitend, aber auch bis zu 2 K als normalleitend beschrieben. Orientierende Versuche zeigen, dass ein Wechsel durch entsprechende thermische Vorbehandlung hervorgerufen werden kann. In umfangreichen präparativen, analytischen und röntgenografischen Untersuchungen werden die Zusammensetzungen für das Auftreten und Verschwinden von Supraleitung in ein und derselben Probe ermittelt. Metallografische Untersuchungen in Verbindung mit Messungen des magnetischen Verhaltens und der spezifischen Wärme belegen eindeutig, dass Supraleitung keine intrinsische Eigenschaft der Phase “La5B2C6” ist, sondern durch Ausscheidungen von B‐haltigem “La2C3‐δ” im C‐reichen und α‐ bzw. β‐La‐Ausscheidungen im metallreichen Gebiet hervorgerufen wird. Die komplette Umhüllung der Boridcarbid‐Kristalle mit La kann trotz dessen geringen Anteils zu vollständiger magnetischer Abschirmung der Proben führen.

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Magnetic properties and structural chemistry of the solid solution La5B2C6–Gd5B2C6

Cited by 10 publications

References 8 publications

Mössbauer and magnetization studies of mechanically milled nanocrystalline Fe_1–_xAl_x alloys

Mössbauer and magnetization studies of mechanically milled nanocrystalline Fe_1–_xAl_x alloys

ChemInform Abstract: Magnetic Properties and Structural Chemistry of the Solid Solution La₅B₂C₆—Gd₅B₂C₆.

Kristall‐ und Realstrukturuntersuchungen zur wiederkehrenden Supraleitung in “La₅B₂C₆”

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Magnetic properties and structural chemistry of the solid solution La5B2C6–Gd5B2C6

Cited by 10 publications

References 8 publications

Mössbauer and magnetization studies of mechanically milled nanocrystalline Fe1–xAlx alloys

Mössbauer and magnetization studies of mechanically milled nanocrystalline Fe1–xAlx alloys

ChemInform Abstract: Magnetic Properties and Structural Chemistry of the Solid Solution La5B2C6—Gd5B2 C6.

Kristall‐ und Realstrukturuntersuchungen zur wiederkehrenden Supraleitung in “La5B2C6”

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Product

Resources

About

Mössbauer and magnetization studies of mechanically milled nanocrystalline Fe_1–_xAl_x alloys

Mössbauer and magnetization studies of mechanically milled nanocrystalline Fe_1–_xAl_x alloys

ChemInform Abstract: Magnetic Properties and Structural Chemistry of the Solid Solution La₅B₂C₆—Gd₅B₂C₆.

Kristall‐ und Realstrukturuntersuchungen zur wiederkehrenden Supraleitung in “La₅B₂C₆”