Giant anisotropic magnetocaloric effect by coherent orientation of crystallographic texture and rare-earth ion moments in HoNiSi ploycrystal

Zhang, Hu; Xing, Changhu; Zhou, He; Zheng, Xinliang; Miao, Xuefei; He, Lunhua; Chen, Jie; Lu, Huaile; Liu, Enke; Han, Wentuo; Zhang, Hongguo; Wang, Yixu; Long, Yi; Eijk, Lambert van; Brück, E.

doi:10.1016/j.actamat.2020.04.031

Cited by 38 publications

(8 citation statements)

References 60 publications

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“…[ 46 ] In addition, considering the obvious anisotropy entropy change in the FMSP as analyzed above, a rotating magnetocaloric effect will be accompanied. [ 47 ] By using the equation

\Delta {{\rm{S}}}_{\rm{R}} = - \ [ {( {\frac{{\delta {E}_{a,{\mu }_0H}}}{{\delta T}}} ) - ( {\frac{{\delta {E}_{a,0}}}{{\delta T}}} )} ] = - ( {\frac{{\delta \Delta {E}_a}}{{\delta T}}} )

, we have calculated the rotating magnetic entropy change, Δ S R . Here,

{E}_{{\rm{a}},{{{\mu}}}_0{\rm{H}}}

and E a,0 represent magnetocrystalline anisotropy energy under a magnetic field μ 0 H and zero field, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Magnetocaloric Effect in Lightly‐Doped Fe₅Si₃ Single Crystals

Cao

Okamoto

Guo

et al. 2023

Advanced Physics Research

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Development of promising new materials for above room temperature magnetic cooling applications relies on careful balancing of structure and composition to maximize accessible metastable phases that can drive a strong magnetocaloric effect (MCE). However, the working temperatures of these materials may fall outside of desired application windows. In this work, it is shown that it is possible to control metastable phase stability temperatures of Fe 5 Si 3 through selection of appropriate spin and charge doping. Here, the parent material's desired structure appears only within a narrow temperature range from 1098 to 1303 K. Doping with Mn and P is shown to allow stabilization of the parent's high temperature phase and resulting MCE to room temperature. The structural and magnetic properties, and the magnetocaloric effect of single crystal Fe 4.83 Mn 0.16 Si 2.91 P 0.09 (FMSP) are investigated experimentally and theoretically. A first-order magneto-elastic transition is observed at 348 K, where magnetic onset is accompanied by a change in lattice volume without an apparent change in crystal symmetry. Although the trace Mn and P doping are found to decrease the T C , the maximum magnetic entropy change 𝚫S Max (T) and the relative cooling power (RCP) of FMSP are enhanced compared to polycrystalline Fe 5 Si 3 . As a result, an intrinsically broader entropy change over a larger temperature span is generated in the lightly doped single crystal of Fe 5 Si 3 . The magnetic moment of the system is also enhanced. Density functional theory (DFT) calculations are performed to gain microscopic insights into the experimental findings. The results suggest that the hexagonal Fe 5 Si 3 is a new giant room temperature MCE material that is on par with La-Fe-Si and Fe-Mn-P-Si systems.

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“…[ 46 ] In addition, considering the obvious anisotropy entropy change in the FMSP as analyzed above, a rotating magnetocaloric effect will be accompanied. [ 47 ] By using the equation

\Delta {{\rm{S}}}_{\rm{R}} = - \ [ {( {\frac{{\delta {E}_{a,{\mu }_0H}}}{{\delta T}}} ) - ( {\frac{{\delta {E}_{a,0}}}{{\delta T}}} )} ] = - ( {\frac{{\delta \Delta {E}_a}}{{\delta T}}} )

, we have calculated the rotating magnetic entropy change, Δ S R . Here,

{E}_{{\rm{a}},{{{\mu}}}_0{\rm{H}}}

and E a,0 represent magnetocrystalline anisotropy energy under a magnetic field μ 0 H and zero field, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…[46] In addition, considering the obvious anisotropy entropy change in the FMSP as analyzed above, a rotating magnetocaloric effect will be accompanied. [47] By using the equation…”

Section: Resultsmentioning

confidence: 99%

Magnetocaloric Effect in Lightly‐Doped Fe₅Si₃ Single Crystals

Cao

Okamoto

Guo

et al. 2023

Advanced Physics Research

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“…To test the feasibility of the homemade uniaxial pressure cell, NCMS alloys prepared by arc melting were used. It is worth noting that the texture structure may be generated with columnar grains along the direction of solidification due to the large temperature gradient from the top to the bottom of the ingot in the arc melting process and such grain distribution microstructure highly affects mechanical properties of the materials [28,29]. As shown in Figure 1b, the NCMS sample with a size of 2 × 2 × 4 mm 3 was cut from the button ingot along the solidification direction.…”

Section: Resultsmentioning

confidence: 99%

“…The equiaxed crystal with a grain size of tens of microns occurs in the cross-section while long strip grain appears in the longitudinal section with sizes of hundreds of microns along the strip direction. This kind of long strip grain induced by the temperature gradient in solidification will highly affect the mechanical properties of NCMS alloys [28,29]. To study the elemental dispersion for NCMS alloy, the composition maps are performed by EDS and the EDS mapping images of Mn, Ni, Co, and Sn elements are shown in Figure 2d.…”

Section: Resultsmentioning

confidence: 99%

Regulation of Magnetocaloric Effect in Ni40Co10Mn40Sn10 Alloys by Using a Homemade Uniaxial Strain Pressure Cell

et al. 2022

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In this study, a homemade uniaxial strain pressure cell was designed to be directly used in the standard magnetometers whereby the magnetic properties of samples subjected to a uniaxial strain and magnetic field were characterized. Its feasibility has been demonstrated by the uniaxial strain control of the phase transition and magnetocaloric effect in Ni40Co10Mn40Sn10 (NCMS) alloys. With the assistance of a uniaxial strain of ~0.5%, the cooling temperature span of NCMS alloys is broadened by 2 K, and the refrigeration capacity under a 3 T magnetic field change increases from 246 to 277 J/kg. This research provides not only direct experimental assistance for the tuning of phase transition by the uniaxial strain but also possibilities for studying the coupled caloric effect in first-order phase transition materials under a combined uniaxial strain and magnetic field by the thermodynamic analysis.

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“…In a magnetic transition induced by field, these features are observed accompanied by changes in volume or symmetry of crystal lattice [18,21]. Recently, many new RTX ternary intermetallics have been synthesized and actively investigated for different d metals as T [22][23][24][25][26][27], as well as usual 3d metals in the second position T in RTX [28][29][30][31][32]. The nontrivial behavior of magnetic and transport properties is found experimentally near the magnetic transition temperatures that makes RTX promising for magnetic refrigeration and other applications [33].…”

Section: Introductionmentioning

confidence: 99%

Effect of Electronic Correlations on the Electronic Structure, Magnetic and Optical Properties of the Ternary RCuGe Compounds with R = Tb, Dy, Ho, Er

et al. 2020

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In this study, the ab initio and experimental results for RCuGe ternary intermetallics were reported for R = Tb, Dy, Ho, Er. Our theoretical calculations of the electronic structure, employing local spin density approximation accounting for electron–electron correlations in the 4f shell of Tb, Dy, Ho, Er ions were carried in DFT+U method. The optical properties of the RCuGe ternary compounds were studied at a broad range of wavelengths. The spectral and electronic characteristics were obtained. The theoretical electron densities of states were taken to interpret the experimental energy dependencies of the experimental optical conductivity in the interband light–absorption region. From the band calculations, the 4f shell of the rare-earth ions was shown to provide the major contribution to the electronic structure, magnetic and optical properties of the RCuGe intermetallics. The accounting for electron–electron correlations in Tb, Dy, Ho, Er resulted in a good agreement between the calculated and experimental magnetic and optical characteristics.

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Giant anisotropic magnetocaloric effect by coherent orientation of crystallographic texture and rare-earth ion moments in HoNiSi ploycrystal

Cited by 38 publications

References 60 publications

Magnetocaloric Effect in Lightly‐Doped Fe₅Si₃ Single Crystals

Magnetocaloric Effect in Lightly‐Doped Fe₅Si₃ Single Crystals

Regulation of Magnetocaloric Effect in Ni40Co10Mn40Sn10 Alloys by Using a Homemade Uniaxial Strain Pressure Cell

Effect of Electronic Correlations on the Electronic Structure, Magnetic and Optical Properties of the Ternary RCuGe Compounds with R = Tb, Dy, Ho, Er

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Giant anisotropic magnetocaloric effect by coherent orientation of crystallographic texture and rare-earth ion moments in HoNiSi ploycrystal

Cited by 38 publications

References 60 publications

Magnetocaloric Effect in Lightly‐Doped Fe5Si3 Single Crystals

Magnetocaloric Effect in Lightly‐Doped Fe5Si3 Single Crystals

Regulation of Magnetocaloric Effect in Ni40Co10Mn40Sn10 Alloys by Using a Homemade Uniaxial Strain Pressure Cell

Effect of Electronic Correlations on the Electronic Structure, Magnetic and Optical Properties of the Ternary RCuGe Compounds with R = Tb, Dy, Ho, Er

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Magnetocaloric Effect in Lightly‐Doped Fe₅Si₃ Single Crystals

Magnetocaloric Effect in Lightly‐Doped Fe₅Si₃ Single Crystals