Evidence for a re-entrant character of magnetism of σ-phase Fe–Mo alloys: Non-linear susceptibilities

Dubiel, S.

doi:10.1016/j.jmmm.2016.02.002

Journal of Magnetism and Magnetic Materials

2016

DOI: 10.1016/j.jmmm.2016.02.002

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Evidence for a re-entrant character of magnetism of σ-phase Fe–Mo alloys: Non-linear susceptibilities

S. Dubiel

Abstract: Non-linear ac magnetic susceptibility terms viz. quadratic 2 and cubic 3 were measured versus temperature and frequency for a series of the -phase Fe100-xMox (47x53) compounds. Clear evidence was found that the ground magnetic state of the samples is mixed i.e. constituted by two phases: a spin glass (SG) and a ferromagnet (FM), hence the magnetism of the investigated samples can be regarded as re-entrant. Based on the present data, previously reported magnetic phase diagram has been upgraded [J. Przewozn… Show more

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Cited by 5 publications

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Structural Plasticity in the Frank‐Kasper Realm: Chemical Pressure Roles of the μ‐ and χ‐Phase Units in the Mo−Fe−Cr System

Hilleke

Kamp

Lin

et al. 2020

Zeitschrift anorg allge chemie

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Intermetallic phases have been known to exhibit a wide diversity since Pauling's seminal investigations into NaCd2 in the 1920s that, along with Cd3Cu4 and Mg2Al3, was shown by Samson to crystallize with a giant cubic cell containing >1000 atoms. The concept of structural plasticity – the notion that complex structures emerge from the release of internal stresses that would arise in simpler structures – has recently been used to account for one family of intermetallics, tracing the structures of Ca2Ag7, Ca14Cd51, CaPd5, and CaCd6 to chemical pressure (CP) issues in the CaCu5 type. Here, we extend the ideal of structural plasticity closer to the giant cells elucidated by Pauling and Samson through its application to a series of Mo−Fe−Cr Frank‐Kasper phases. We begin with a DFT‐CP analysis of the MgZn2‐type phase MoFe2, which serves as a parent structure to μ‐Mo6Fe7 and χ‐Mo5Cr6Fe18. The analysis reveals negative CPs around the Mo atoms arising from collisions between the Fe atoms. Tighter Mo coordination is provided in the μ‐ or χ‐phases by substituting some of the Friauf polyhedra of MoFe2 with either μ‐ and χ‐phase units, resulting in layers or blocks of Laves‐like connectivity. Sites preferences in the μ‐phase and the role of Cr substitution in the χ‐phase are explained through the dual lenses of CP and electronegativity. Parallels to the features of NaCd2 hint that such giant‐unit‐celled intermetallics can represent striking manifestations of structural plasticity.

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Structural Plasticity in the Frank‐Kasper Realm: Chemical Pressure Roles of the μ‐ and χ‐Phase Units in the Mo−Fe−Cr System

Hilleke

Kamp

Lin

et al. 2020

Zeitschrift anorg allge chemie

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Effect of magnetism on lattice vibrations: Mössbauer spectroscopic evidence

Dubiel

2022

Journal of Magnetism and Magnetic Materials

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Mössbauer-effect study of dynamic, magnetic, and electronic properties of C14 Laves phase Nb0.975Fe2.025

Żukrowski

Dubiel

2018

Journal of Applied Physics

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C14 Laves phase Nb0.975Fe2.025 compound was investigated by means of the Mössbauer spectroscopy. Spectra were recorded in the temperature range of 5–300 K. Their analysis in terms of three sub-spectra yielded information on magnetic and lattice dynamical properties of Fe atoms regularly occupying 2a and 6h lattice sites and, excessively, 4f sites. No indication of magnetism was observed down to the temperature of T ≈ 60 K, and spectral parameters, viz., center shift, CS, and the main component of the electric field gradient, Vzz, behave regularly. In particular, analysis of CS(T) in terms of the Debye model yielded the following values of the Debye temperature, TD: 453(5) K for the site 6h, 544(10) K for the site 2a, 479(4) K for the weighted average over 6h and 2a sites, and 363(35) K for the site 4f. Below ∼60 K, anomalous behavior was observed: a broadening of the spectrum appeared indicating thereby a transition into a magnetic phase. Analysis of a temperature dependence of the hyperfine field, B, associated with the 6h and 2a sub-spectra yielded different values of the magnetic ordering temperature. The maximum values of the hyperfine field at 5 K, Bo, were 8.2 kGs and 3.3 kGs, for 6h and 2a, respectively. The Bo-values were used to estimate values of the underlying magnetic moments, μFe(6h) = 0.055–0.065 μB and μFe(2a) = 0.02–0.025 μB. Noteworthy, they are over one order of magnitude lower than those theoretically calculated. The CS and Vzz parameters showed anomalies in the magnetic phase, in particular the former exhibited a strong departure from the Debye model prediction testifying to a significant effect of magnetism on the lattice vibrations.

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Evidence for a re-entrant character of magnetism of σ-phase Fe–Mo alloys: Non-linear susceptibilities

Cited by 5 publications

References 26 publications

Structural Plasticity in the Frank‐Kasper Realm: Chemical Pressure Roles of the μ‐ and χ‐Phase Units in the Mo−Fe−Cr System

Structural Plasticity in the Frank‐Kasper Realm: Chemical Pressure Roles of the μ‐ and χ‐Phase Units in the Mo−Fe−Cr System

Effect of magnetism on lattice vibrations: Mössbauer spectroscopic evidence

Mössbauer-effect study of dynamic, magnetic, and electronic properties of C14 Laves phase Nb0.975Fe2.025

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