A Mössbauer study of Fe2P1−xSix (x ≤ 0.35)

Jernberg, Per; Yousif, A. A.; Häggström, Lennart; Andersson, Yvonne

doi:10.1016/0022-4596(84)90108-7

Cited by 54 publications

(56 citation statements)

References 6 publications

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“…Electron transfer from the Fe and Mn d band to the P and Si p band would be expected to fill the P and Si p band, which enhances the splitting of the Fe and Mn d band and thus increases the magnetic moment of the Fe and Mn supplying the electrons. This electron transfer feature is more pronounced for coplanar metal-nonmetal neighbors, as indicated by the isomer shift in Mössbauer spectra of Fe 2 (P,Si) compounds [19]. Since Si has less valence electrons than P, the preferred occupation of Si on the 2c site would bring larger magnetic moments on its coplanar 3f site.…”

Section: Resultsmentioning

confidence: 87%

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Tuning the phase transition in transition-metal-based magnetocaloric compounds

et al. 2014

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Neutron-diffraction experiments on the (Mn,Fe) 2 (P,Si)-type compounds have shown a site preference of Si atoms in the hexagonal structure. The degree of ordering of Si depends on the Si/P ratio, while it is independent of the Mn/Fe ratio. The ferromagnetic-paramagnetic magnetoelastic transition is closely related to the size of the magnetic moment on the 3f site. A preferred occupation of Si atoms on the 2c site stabilizes and decreases the magnetic moment on the 3f and 3g site, respectively, which is supported by our first-principles density functional theory calculations. This effect, together with the contribution from the Si substitution-induced changes in the interatomic distances, leads to a phase transition that is tunable in temperature and degree of first order in Mn 1.25 Fe 0.70 P 1−x Si x compounds. These results provide us with further insight into the relationship between the magnetoelastic phase transition and the local atomic coordination.

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Section: Resultsmentioning

confidence: 87%

“…Mössbauer spectroscopy shows that Si substitution for P in Fe 2 P changes the local electronic structure and hyperfine fields of its coplanar Fe atoms [19]. Theoretical calculations in the (Mn,Fe) 2 (P,Si) yield higher Fe (Mn) moments * x.f.miao@tudelft.nl when a larger number of coplanar Si nearest neighbors is considered [13].…”

Section: Introductionmentioning

confidence: 99%

Tuning the phase transition in transition-metal-based magnetocaloric compounds

et al. 2014

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“…Substitution of As, B, or Si into the P sublattice results in an increase of the Curie temperature, which can easily be lifted to above room temperature for As or Si concentrations of 10% or B concentrations of 4%. [ 118 ] The most extensively studied series of alloys is of the type MnFe, MnP, and MnAs. The most striking feature of the MnFeP-MnFeAs phase diagram is the stability of the hexagonal Fe 2 P-type structure for As concentrations between 30 and 65%.…”

Section: Fe 2 P-based Compoundsmentioning

confidence: 99%

Magnetic Materials and Devices for the 21st Century: Stronger, Lighter, and More Energy Efficient

et al. 2010

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A new energy paradigm, consisting of greater reliance on renewable energy sources and increased concern for energy efficiency in the total energy lifecycle, has accelerated research into energy-related technologies. Due to their ubiquity, magnetic materials play an important role in improving the efficiency and performance of devices in electric power generation, conditioning, conversion, transportation, and other energy-use sectors of the economy. This review focuses on the state-of-the-art hard and soft magnets and magnetocaloric materials, with an emphasis on their optimization for energy applications. Specifically, the impact of hard magnets on electric motor and transportation technologies, of soft magnetic materials on electricity generation and conversion technologies, and of magnetocaloric materials for refrigeration technologies, are discussed. The synthesis, characterization, and property evaluation of the materials, with an emphasis on structure-property relationships, are discussed in the context of their respective markets, as well as their potential impact on energy efficiency. Finally, considering future bottlenecks in raw materials, options for the recycling of rare-earth intermetallics for hard magnets will be discussed.

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“…This percentage reduction description was chosen because preliminary fits indicated that the absolute reduction in the field is not constant as a function of temperature, whereas the percentage reduction is essentially constant, except at temperatures near the first-order magnetic phase transition. The effect of the substitution of a near-neighbor anion on the hyperfine fields has been studied 15,16 in the isostructural Fe 2 P 1−x B x and Fe 2 P 1−x Si x compounds and, more specifically, the substitution of P by As in FeMnP 1−x As x is known 14 to reduce the hyperfine field by about 1.4 T per substituted anion. By using the probabilities in Eq.…”

Section: Structure and Distribution Of Phosphorus And Arsenicmentioning

confidence: 99%

Mössbauer spectral study of the magnetocaloricFeMnP1−xAsxcompounds

Hermann

Tegus²,

Brück³

et al. 2004

Phys. Rev. B

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The magnetic phase transitions in the FeMnP 1−x As x compounds with x= 0.25, 0.35, 0.45, 0.50, and 0.55, have been studied by iron-57 Mössbauer spectroscopy. The ferromagnetic and antiferromagnetic spectra have been analyzed with a model that takes into account the random distribution of the P and As near-neighbor anions of a given iron site. This distribution is a binomial distribution of the contributions to the spectra of each iron with n As near neighbors. A magnetostriction model has been used to characterize the temperature induced paramagnetic to ferromagnetic first-order phase transition and order parameters, F = 2.6, 2.3, 2.0, 1.57, and 1.43 have been obtained for x = 0.25, 0.35, 0.45, 0.50, and 0.55, respectively. A detailed phase diagram has been derived from the Mössbauer spectral analysis and reveals a magnetic triple point at x = ϳ 0.35 and ϳ210 K. A model that takes into account the random binomial P and As distribution and the contribution from the iron and manganese magnetic sublattices yields excellent fits of the spectral components assigned to the ferromagnetic and incommensurate antiferromagnetic components for the x = 0.25 and 0.35 compounds at all temperatures.

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A Mössbauer study of Fe2P1−xSix (x ≤ 0.35)

Cited by 54 publications

References 6 publications

Tuning the phase transition in transition-metal-based magnetocaloric compounds

Tuning the phase transition in transition-metal-based magnetocaloric compounds

Magnetic Materials and Devices for the 21st Century: Stronger, Lighter, and More Energy Efficient

Mössbauer spectral study of the magnetocaloricFeMnP1−xAsxcompounds

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