Overview of magnetoelastic coupling in (Mn, Fe)2(P, Si)-type magnetocaloric materials

Miao, Xuefei; Hu, Shu‐Yuan; Xu, Feng; Brück, E.

doi:10.1007/s12598-018-1090-2

Cited by 39 publications

(8 citation statements)

References 104 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In fact, a superimposed "susceptibility" (slope) for about 5% in magnetization was found for fields varying from 0 to 10 T. One can anticipate that some AF couplings could have taken place for these two samples, breaking an easy approach to the saturation state. All the values reported in Table 3 agree with those determined earlier by Ou and Dung for Mn2−xFexP1−ySiy compounds having similar or close compositions (e.g., by the group of Delft) [41,43,49].…”

Section: Mce Characterizationssupporting

confidence: 88%

Structure and Magnetic Properties of Bulk Synthesized Mn2−xFexP1−ySiy Compounds from Magnetization, 57Fe Mössbauer Spectroscopy, and Electronic Structure Calculations

et al. 2019

View full text Add to dashboard Cite

† Deceased end October 2018 when completing this work dedicated to Stanek, a high level and gentleman scientist.Abstract: The series of Mn 2−x Fe x P 1−y Si y types of compounds form one of the most promising families of magnetocaloric materials in term of performances and availability of the elemental components. Potential for large scale application needs to optimize the synthesis process, and an easy and rather fast process here described is based on the use of two main type of precursors, providing the Fe-P and Mn-Si proportions. The series of Mn 2−x Fe x P 1−y Si y compounds were synthesized and carefully investigated for their crystal structure versus temperature and compared interestingly with earlier results. A strong magnetoelastic effect accompanying the 1st order magnetic transition-as well as the parent phosphide-arsenides-was related to the relative stability of both the Fe magnetic polarization and the Fe-Fe exchange couplings. In order to better understand this effect, we propose a local distortion index of the non-metal tetrahedron hosting Fe atoms. Besides, from Mn-rich (Si-rich) to Fe-rich (P-rich) compositions, it is shown that the magnetocaloric phenomenon can be established on demand below and above room temperature. Excellent performance compounds were realized in terms of magnetic entropy ∆S m and adiabatic temperature ∆T ad variations. Since from literature it was seen that the magnetic performances are very sensitive to the synthesis process, correspondingly here a new effective process is proposed. Mössbauer spectroscopy analysis was performed on Mn-rich, equi-atomic Mn-Fe, and Fe-rich compounds, allowing determination of the distribution of hyperfine fields setting on Fe in the tetrahedral and pyramidal sites, respectively. Electronic structure calculations confirmed the scheme of metal and non-metal preferential ordering, respectively. Moreover, the local magnetic moments were derived, in fair agreement with both the experimental magnetization and the Fe contributions, as determined by Mössbauer spectroscopy.The series of pnictides related to the Fe 2 P type, which we have studied for a long time, exhibit very unusual magnetic properties, as detailed in a series of reports [1][2][3]. In fact, these ternary compounds TT'X (T, T' = transition metals, X = P, As, Si, Ge etc.) crystalize in one of three types of structures: orthorhombic (SG Pnma: O4), hexagonal (SG P-62m: H3), and tetragonal (SG P4 2 /nmm: T2). The polytype structures, from the most to the least dense compacting modes of a unique Rhombus (R) block (with 4, 3, and 2 blocks successively), are formed from two X-tetrahedrons and two-X-pyramids coordinating T and T' [1,4]. The compaction level of the structure directly impacts the magnetic characteristic of the polytypic series when T and T' share magnetic trends. In fact, the tetragonal compounds, being mostly arsenides (X = As), exhibit antiferromagnetic (AF) characteristics [4,5], while the orthorhombic compounds, being mostly phosphides, exhibit typically non-collinear and l...

show abstract

Section: Mce Characterizationssupporting

confidence: 88%

Structure and Magnetic Properties of Bulk Synthesized Mn2−xFexP1−ySiy Compounds from Magnetization, 57Fe Mössbauer Spectroscopy, and Electronic Structure Calculations

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Compared with other MCE materials, (Mn,Fe) 2 (P,Si) alloys have large magnetic entropy change, tunable working temperature range, and the lowest raw material cost, and are considered to be the best candidate for room temperature magnetic refrigeration materials. [16][17][18][19][20] For (Mn,Fe) 2 (P,Si) alloys, it is a hexagonal Fe 2 P-type structure (space group P62m), which contains two metallic sites (3g and 3f ) and two nonmetallic sites (1b and 2c). Neutron diffraction experiments and first-principles calculations indicate that Mn atoms predominantly occupy 3g sites with five surrounding nonmetallic atoms forming a pyramid structure, and Fe atoms prefer the 3f sites with four surrounding nonmetallic atoms forming a tetrahedron structure.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn_0.975Fe_0.975P_0.5Si_0.5 Alloys by Optimizing Quenching Temperature

Zheng

Wang

et al. 2022

Adv Eng Mater

View full text Add to dashboard Cite

The effect of quenching temperature on phase structure and magnetocaloric properties of the Mn0.975Fe0.975P0.5Si0.5 alloys are systematically studied by X‐ray diffraction, scanning electron microscope, differential scanning calorimetry, and vibrating sample magnetometer. The Mn0.975Fe0.975P0.5Si0.5 alloys quenched at 1323, 1073, 873, and 673 K are all crystallized in the hexagonal Fe2P‐type phase and the phase fraction of the Fe2P phase increases with the decreases of quenching temperature. As the quenching temperature decreases from 1323 to 673 K, the crystal lattice of alloys expands and the atoms' occupation is more ordered, while the saturation magnetic moment increases from 3.71 to 4.10 μB f.u.−1 The values of thermal hysteresis increase linearly from 30 to 41 K when the quenching temperature is down to 673 K. This enhancement of the first‐order magnetic transition (FOMT) yields the maximum value of magnetic entropy change at 5 T increasing by 36%. To obtain excellent comprehensive properties for (Mn,Fe)2(P,Si) alloys, the methods of doping B element in the Mn0.975Fe0.975P0.5Si0.5 alloy are employed to tune the magnetocaloric properties. The results provide insights and systematic understanding into the effect of quenching temperature on the magnetocaloric properties of (Mn,Fe)2(P,Si)‐based alloys.

show abstract

“…When transforming from the paramagnetic to the ferromagnetic state, the lattice constant a increases and causes a stronger localization for the 3d electrons of Fe (3f) instead of chemical bonding with non-metallic P and Si. Jointly with the lattice constant c, decreases the interlayer distance between the Mn and Fe atoms and thereby enhances the magnetic exchange interaction between two magnetic atoms [34]. Therefore, adding V to Mn 1-x2 V x2 Fe 0.95 P 0.593 Si 0.33 B 0.077 compounds will increase the c/a ratio and leads to a reduction in the magnetic exchange interaction.…”

Section: Resultsmentioning

confidence: 99%

Ultra-low hysteresis in giant magnetocaloric Mn1-V Fe0.95(P,Si,B) compounds

Lai

You

Law

et al. 2023

Journal of Alloys and Compounds

Self Cite

View full text Add to dashboard Cite

Overview of magnetoelastic coupling in (Mn, Fe)2(P, Si)-type magnetocaloric materials

Cited by 39 publications

References 104 publications

Structure and Magnetic Properties of Bulk Synthesized Mn2−xFexP1−ySiy Compounds from Magnetization, 57Fe Mössbauer Spectroscopy, and Electronic Structure Calculations

Structure and Magnetic Properties of Bulk Synthesized Mn2−xFexP1−ySiy Compounds from Magnetization, 57Fe Mössbauer Spectroscopy, and Electronic Structure Calculations

Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn_0.975Fe_0.975P_0.5Si_0.5 Alloys by Optimizing Quenching Temperature

Ultra-low hysteresis in giant magnetocaloric Mn1-V Fe0.95(P,Si,B) compounds

Contact Info

Product

Resources

About

Overview of magnetoelastic coupling in (Mn, Fe)2(P, Si)-type magnetocaloric materials

Cited by 39 publications

References 104 publications

Structure and Magnetic Properties of Bulk Synthesized Mn2−xFexP1−ySiy Compounds from Magnetization, 57Fe Mössbauer Spectroscopy, and Electronic Structure Calculations

Structure and Magnetic Properties of Bulk Synthesized Mn2−xFexP1−ySiy Compounds from Magnetization, 57Fe Mössbauer Spectroscopy, and Electronic Structure Calculations

Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn0.975Fe0.975P0.5Si0.5 Alloys by Optimizing Quenching Temperature

Ultra-low hysteresis in giant magnetocaloric Mn1-V Fe0.95(P,Si,B) compounds

Contact Info

Product

Resources

About

Enhancement of Magnetic Properties and Magnetocaloric Effects for Mn_0.975Fe_0.975P_0.5Si_0.5 Alloys by Optimizing Quenching Temperature