Microstructural changes in Fe-doped Gd5Si2Ge2

Podmiljsak, Benjamin; Škulj, Irena; Markoli, Boštjan; Rožman, Kristina Žužek; McGuiness, P.J.; Kobe, Spomenka

doi:10.1016/j.jmmm.2008.09.001

Cited by 16 publications

(4 citation statements)

References 11 publications

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“…The most evident cases are the (121) at 2θ = 6.51 • (a rare case of a well separated reflection) and a group of 8 reflections between 2θ = 8.20 • and 8.60 • . The difference in the background is also evident and consistent with the incoherent paramagnetic scattering at 310 K. Two small bumps near 1.48 • and 3.55 • are supposed to correspond to the low temperature magnetic diffraction of the 5:3 phase, below 110 K [20]. From magnetic measurements the magnetic structure of the hexagonal Gd 5 Ge 3 at low temperature was supposed to be helical [21].…”

Section: Neutron Diffractionsupporting

confidence: 68%

Magnetic structure of Gd₅Si₂Ge₂and Gd₅Si₂Ge_1.9M_0.1(M = Ga, Cu)

Palacios

Rodríguez-Velamazán

Wang

et al. 2010

J. Phys.: Condens. Matter

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Powder x-ray diffraction patterns of the doped compounds Gd(5)Si(2)Ge(1.9)M(0.1) (M = Ga, Cu) show the same crystal structure, orthorhombic Gd(5)Si(4)-type, in the ferromagnetic and paramagnetic phases. This is different from Gd(5)Si(2)Ge(2), whose paramagnetic phase is monoclinic. The magnetic structure at low temperature, solved from diffraction experiments with hot neutrons, is the same in all the three compounds, collinear ferromagnetic with moments along the crystal b-axis, or F(y)F(By) according to Bertaut's notation. These results, combined with those of heat capacity and magnetocaloric effect, indicate, similarly to Gd(5)Si(4), a second-order, purely magnetic, transition in the doped compounds explaining the absence of hysteresis.

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Section: Neutron Diffractionsupporting

confidence: 68%

Magnetic structure of Gd₅Si₂Ge₂and Gd₅Si₂Ge_1.9M_0.1(M = Ga, Cu)

Palacios

Rodríguez-Velamazán

Wang

et al. 2010

J. Phys.: Condens. Matter

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“…This is consistent with an increasingly Ge-rich matrix phase, reported in a recent scanning electron microscopy/energy dispersive x-ray spectroscopy-based study. 5 Shull et al 6 previously reported that a certain amount of silicon in the Cu-doped alloy was segregated to the grain boundaries to form Cu-and Si-rich minority phases, thereby depleting the Si content of the majority phase. They concluded that the field-induced transformation is suppressed when a multiphase structure appears as a result of adding a new element.…”

Section: Resultsmentioning

confidence: 99%

Magnetocaloric properties and nanoscale structure of Fe-doped Gd5Ge2Si2 alloys

Podmiljsak

McGuiness

Miklavič

et al. 2009

Journal of Applied Physics

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“…The (structural) inhomogeneities in Gd alloy systems may influence their magnetic properties [20,21,22]. The microstructure, i.e.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Anisotropy of Magnetocaloric Gadolinium Cylinders: Effect on the Mechanical Properties of the Material

et al. 2016

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The development of advanced materials and technologies based on magnetocaloric Gd and its compounds requires an understanding of the dependency of mechanical properties on their underlying microstructure. Therefore, the aim of the study was to characterize microstructural inhomogeneities in the gadolinium that can be used in magnetocaloric refrigeration systems. Microstructures of magnetocaloric gadolinium cylinders were investigated by light microscopy and FE-SEM (Field Emission Scanning Electron Microscopy), EDS (Energy-dispersive X-ray Spectroscopy), and BSE (Back-scattered Electrons) in both the extrusion and the extrusion-transversal directions. XRD (X-ray Diffraction) analyses were performed to reveal the presence of calcium- and fluorine-based compounds. Metallographic characterization showed an oxidized and inhomogeneous microstructure of the cross-sections. The edges and the outer parts of the cylinders were oxidized more intensively on the surfaces directly exposed to the processing tools. Moreover, a significant morphological anisotropy of the non-metallic inclusions was observed. CaF inclusions act as active nucleation sites for internal oxidation. The non-metallic, Ca- and F-containing inclusions can be classified as complex calciumoxyfluorides. The solubility of Er and Yb in the CaF was negligible compared to the Gd matrix and/or the oxide phase. Lower mechanical properties of the material are a consequence of the lower structural integrity due to selective oxidation of surfaces and interfaces.

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Microstructural changes in Fe-doped Gd5Si2Ge2

Cited by 16 publications

References 11 publications

Magnetic structure of Gd₅Si₂Ge₂and Gd₅Si₂Ge_1.9M_0.1(M = Ga, Cu)

Magnetic structure of Gd₅Si₂Ge₂and Gd₅Si₂Ge_1.9M_0.1(M = Ga, Cu)

Magnetocaloric properties and nanoscale structure of Fe-doped Gd5Ge2Si2 alloys

Microstructural Anisotropy of Magnetocaloric Gadolinium Cylinders: Effect on the Mechanical Properties of the Material

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Microstructural changes in Fe-doped Gd5Si2Ge2

Cited by 16 publications

References 11 publications

Magnetic structure of Gd5Si2Ge2and Gd5Si2Ge1.9M0.1(M = Ga, Cu)

Magnetic structure of Gd5Si2Ge2and Gd5Si2Ge1.9M0.1(M = Ga, Cu)

Magnetocaloric properties and nanoscale structure of Fe-doped Gd5Ge2Si2 alloys

Microstructural Anisotropy of Magnetocaloric Gadolinium Cylinders: Effect on the Mechanical Properties of the Material

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Magnetic structure of Gd₅Si₂Ge₂and Gd₅Si₂Ge_1.9M_0.1(M = Ga, Cu)

Magnetic structure of Gd₅Si₂Ge₂and Gd₅Si₂Ge_1.9M_0.1(M = Ga, Cu)