Magnetic Properties of the System Fe<sub>2</sub>P-Mn<sub>2</sub>P

Nagase, Shigemi; Watanabe, Hiroshi; Shinohara, T.

doi:10.1143/jpsj.34.908

Cited by 33 publications

(14 citation statements)

References 4 publications

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“…Because hexagonal Fe x Mn 2− x P ( x= 1) had not previously been prepared by conventional methods, the values of this effective moment and Weiss temperature were compared to, and interpolated from, known values for hexagonal Fe x Mn 2− x P in the ranges x <0.65 and x >1.35. The current data lies in the gap and is consistent with the previously reported data . If the preferentially oxidized manganese had an effect on the stoichiometry of the film, the Weiss temperature would be expected to shift to a larger value, but instead matches the atomic range for Fe:Mn:P of 1:1:1.…”

Section: Resultssupporting

confidence: 90%

“…Fe x Mn 2− x P prepared by conventional solid‐state methods is known to be orthorhombic, with the Co 2 P‐type lattice, in the compositional range of 0.65< x <1.35 and hexagonal, with the Fe 2 P‐type lattice, outside of that range. The x= 1 intermetallic compound undergoes a reversible transition above 1200 °C to the hexagonal Fe 2 P‐type lattice . Iron, manganese, and phosphorus are known to occupy different localized 4c positions in the FeMnP orthorhombic lattice while the metal sites in the hexagonal lattice are disordered among the 3f and 3g sites and the phosphorus atoms are located in two different positions at full occupancy.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Hexagonal FeMnP Thin Films from a Single‐Source Molecular Precursor

Leitner

Schipper

Chen

et al. 2017

Chemistry A European J

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The first heterobimetallic phosphide thin film containing iron, manganese, and phosphorus, derived from the single-source precursor FeMn(CO) (μ-PH ), has been prepared using a home-built metal-organic chemical vapor deposition apparatus. The thin film contains the same ratio of iron, manganese, and phosphorus as the initial precursor. The film becomes oxidized when deposited on a quartz substrate, whereas the film deposited on an alumina substrate provides a more homogeneous product. Powder X-ray diffraction confirms the formation of a metastable, hexagonal FeMnP phase that was previously only observed at temperatures above 1200 °C. Selected area electron diffraction on single crystals isolated from the films was indexed to the hexagonal phase. The effective moment of the films (μ =3.68 μ ) matches the previously reported theoretical value for the metastable hexagonal phase, whereas the more stable orthorhombic phase is known to be antiferromagnetic. These results not only demonstrate the successful synthesis of a bimetallic, ternary thin film from a single-source precursor, but also the first low temperature approach to the hexagonal phase of FeMnP.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Synthesis of Hexagonal FeMnP Thin Films from a Single‐Source Molecular Precursor

Leitner

Schipper

Chen

et al. 2017

Chemistry A European J

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“…Complete mutual solubility was assumed between Fe 2 P and Mn 2 P, in agreement with the experimental data of Ref 8,9, though according to other authors, [10][11][12] an ordering reaction (at an undetermined temperature) yielding to an orthorhombic structure for compositions 0.31 < x < 0.62 of (Fe 1Àx ,Mn x ) 2 P [13] was observed.…”

Section: Phases Modeling and Datasupporting

confidence: 82%

Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P

Miettinen

Vassilev

2014

J. Phase Equilib. Diffus.

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Thermodynamic descriptions of the Fe-Mn-P system and its binary sub-system, Mn-P, are developed in the frame of a new Fe-X-P (X = Al, Cr, Cu, Mn, Mo, Nb, Ni, Si, Ti) database. The thermodynamic parameters of the binary sub-systems, Fe-Mn and Fe-P, are taken from the latest earlier assessments. Those of the Fe-Mn-P and Mn-P systems are optimized in this study using literature experimental thermodynamic and phase equilibrium data. The solution phases of the system are described with the substitutional solution model and the phosphides are treated as stoichiometric phases or semi-stoichiometric phases of the (A,B) p C q type described with the two-sublattice model. The formation of a miscibility gap in the liquid phase, at high P-contents is predicted.

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“…15 Since hexagonal Mn x Fe 2Àx P (x > 1.35) is antiferromagnetic, 19 the present study indicates that the Si addition supports a ferromagnetic order. The enhancement of the ferromagnetism by replacing P with Si was also observed in Fe 2 (P,Si).…”

mentioning

confidence: 53%

From first-order magneto-elastic to magneto-structural transition in (Mn,Fe)1.95P0.50Si0.50 compounds

Dung

Zhang

et al. 2011

Applied Physics Letters

118

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We report on structural, magnetic, and magnetocaloric properties of Mn x Fe 1.95Àx P 0.50 Si 0.50 (x ! 1.10) compounds. With increasing the Mn:Fe ratio, a first-order magneto-elastic transition gradually changes into a first-order magneto-structural transition via a second-order magnetic transition. The study also shows that thermal hysteresis can be tuned by varying the Mn:Fe ratio. Small thermal hysteresis (less than 1 K) can be obtained while maintaining a giant magnetocaloric effect. This achievement paves the way for real refrigeration applications using magnetic refrigerants. Nowadays, advanced magnetocaloric materials often undergo a first-order magnetic transition (FOMT), [1][2][3][4] because the FOMT is associated with an abrupt change in crystal lattice which enhances magnetocaloric effects (MCEs) via a spin-lattice coupling. The FOMT can be divided into first-order magneto-structural transition (FOMST), which exhibits a structure change coupled with a magnetic transition as observed for Gd 5 (Ge x Si 1Àx ) 4 , 5,6 Ni 0.50 Mn 0.50Àx Sn x (Ref. 7), and MnCoGeB x , 8 or first-order magneto-elastic transition (FOMET) for which the crystal structure remains unchanged but the lattice constants suddenly change at the magnetic transition, as observed for MnFeP 1Àx As x (Ref. 9) and La(Fe 1Àx Si x ) 13 . 10,11Fe 2 P-based compounds are known as giant magnetocaloric materials with a FOMET. Most studies have recently focused on (Mn,Fe) 2 (P,As,Ge) compounds.1-3,9,12,13 However, the limited availability of Ge and toxicity of As hold these materials back from real refrigeration applications. Substitution of Si for As and Ge becomes one of the most prominent studies towards making a high performance room-temperature magnetic refrigerant. Some efforts have been made to reduce thermal hysteresis (DT hys ) which was found to be very large (DT hys ¼ 35 K) in the MnFeP 0.50 Si 0.50 alloy.14 Here, we report on (Mn,Fe) 1.95 P 0.50 Si 0.50 compounds when changing the Mn:Fe ratio with emphasis on the behavior of magnetic and structural transitions. We observe a previously unknown FOMST and a modified FOMET favorable for real refrigeration applications.The (Mn,Fe) 1.95 P 0.50 Si 0.50 alloys were prepared by ballmilling. Proper amounts of Mn (99.9%), Si (99.999%) chips, binary Fe 2 P (99.5%), and red-P (99.7%) powder were mixed and ball-milled for 10 h. The fine powder was then pressed into small tablets and sealed in quartz ampoules in an Ar atmosphere of 200 mbar. The samples were sintered at 1373 K for 2 h and then annealed at 1123 K for 20 h before being oven cooled to room temperature. Magnetic measurements were carried out using the reciprocating sample option (RSO) mode in a superconducting quantum interference device (SQUID) magnetometer (Quantum Design MPMS 5XL). X-ray diffraction patterns were obtained by a PANalytical X-pert Pro diffractometer with Cu Ka radiation, secondary flat crystal monochromator, and X'celerator real time multiple strip (RTMS) detector system.The room-temperature x-ray diffraction measurement...

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Magnetic Properties of the System Fe₂P-Mn₂P

Cited by 33 publications

References 4 publications

Synthesis of Hexagonal FeMnP Thin Films from a Single‐Source Molecular Precursor

Synthesis of Hexagonal FeMnP Thin Films from a Single‐Source Molecular Precursor

Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P

From first-order magneto-elastic to magneto-structural transition in (Mn,Fe)1.95P0.50Si0.50 compounds

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Magnetic Properties of the System Fe2P-Mn2P

Cited by 33 publications

References 4 publications

Synthesis of Hexagonal FeMnP Thin Films from a Single‐Source Molecular Precursor

Synthesis of Hexagonal FeMnP Thin Films from a Single‐Source Molecular Precursor

Thermodynamic Description of Ternary Fe-X-P Systems. Part 3: Fe-Mn-P

From first-order magneto-elastic to magneto-structural transition in (Mn,Fe)1.95P0.50Si0.50 compounds

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Magnetic Properties of the System Fe₂P-Mn₂P