Structure and magnetic behaviors of Gd 6 FeBi 2 compound

Zhang, Jiliang; Shan, Guangcun; Zheng, Zhigang; Shek, C.H.

doi:10.1016/j.intermet.2015.07.013

Cited by 11 publications

(23 citation statements)

References 28 publications

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“…[20]. Table 1 shows the T C , (−ΔS M ) max and RC values obtained from our samples and previously fabricated some Fe-based metallic glass MCMs under the applied field of 1.5 and 2 T. Although tuning the T C of our alloys to room temperature may reduce the values of RC, these values are comparable with those of previously casted Fe-based metallic glasses.…”

Section: Resultssupporting

confidence: 73%

“…Magnetic refrigeration based on the MCE can effectively reduce environmental impact when compared with the conventional gas compression-expansion cooling technology [11]. Therefore, as the using materials of the magnetic refrigeration technology, a lot of crystalline and amorphous materials with high MCE have been produced in recent years [12][13][14][15][16][17][18][19][20][21][22][23]. The basic demands of magnetocaloric materials (MCM) for magnetic cooling are the tuneable T C , high (-ΔS M ) and RC.…”

Section: Introductionmentioning

confidence: 99%

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Magnetocaloric and magnetoresistance properties in Co-based (Co_0.402Fe_0.201Ni_0.067B_0.227Si_0.053Nb_0.05)_100−xCu_x (x=0–1) glassy alloys

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Adam

et al. 2016

Philosophical Magazine

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The magnetocaloric and magnetoresistance properties of amorphous Co-based (Co 0.402 Fe 0.201 Ni 0.067 B 0.227 Si 0.053 Nb 0.05 ) 100−x Cu x (x = 0, 0.5, 0.75 and 1) ribbons were investigated. Cu additions changed the crystallisation temperature (T x ) and the Curie temperature (T C ). The saturation magnetisation (M s ) and coercivity (H c ) for alloys were in the range of 65.51-38.49 emu/g and 1.99-6.84 A/m, respectively. Under an applied magnetic field change of 2.2 T, the (−ΔS M ) max for (Co 0.402 Fe 0.201 Ni 0.067 B 0.227 Si 0.053 Nb 0.05 ) 100−x Cu x with x = 0, 0.5, 0.75 and 1 are 0.77, 0.71, 0.89 and 0.67 Jkg −1 K −1 , respectively. The values of refrigeration capacity (RC) for the as-spun glassy alloys are comparable with those of previously studied Fe-based metallic glasses such as Fe 80 B 10 Zr 9 Cu 1 , (Fe 0.76 B 0.24 ) 96 Nb 4 and Fe 82 Ni 2 Zr 6 B 10 . In addition, the maximum magnetoresistance (MR) values for (Co 0.402 Fe 0.201 Ni 0.067 B 0.227 Si 0.053 Nb 0.05 ) 100−x Cu x with x = 0, 0.5, 0.75 and 1 are found to be 110, 38, 23 and 1% around the Curie temperatures under an applied magnetic field change of 1 T, respectively. With good RC, negligible hysteresis due to very low coercivity values and large magnetoresistance, these Co-based amorphous alloys can be used as the high temperature magnetic refrigerants and multifunctional applications working in the temperature range of 450-600 K.

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Section: Resultssupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Magnetocaloric and magnetoresistance properties in Co-based (Co_0.402Fe_0.201Ni_0.067B_0.227Si_0.053Nb_0.05)_100−xCu_x (x=0–1) glassy alloys

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Şarlar

Adam

et al. 2016

Philosophical Magazine

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“…Gd4Bi3 and the present compound [11,17,34]. It is also suggested by the observation that the temperature shift of the vibronic peak was proportional to the splitting of ground level in LaCaMnO perovskite manganites [35].…”

Section: Magnetic Exchange Interaction and Electronic Structuresupporting

confidence: 54%

Understanding high ordering temperature in Gd6FeBi2 magnet: Critical behavior, electronic structure and crystal-field analysis

Chen

Wong

et al. 2020

Journal of Magnetism and Magnetic Materials

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Gd6FeBi2 is reported as the only one room-temperature magnet with a Curie temperature (Tc) of ca. 350 K among more than hundreds of compounds with its structural type, which makes it more attractive in potential applications. To reveal the origin of such high ordering temperature, critical behaviors, electronic structure and crystal-field effects of Gd6FeBi2 are investigated in this work. The short-range Gd-Fe ferrimagnetic interaction is supported by the non-Curie-Weiss paramagnetic behavior, crystal and electronic structure analyses, in agreement with previous DFT calculations. Unlike the strong TM-TM exchange interactions, the Gd-Fe exchange interaction shows limited influence on the critical exponents determined by long-range exchange interactions, which seems a common feature in RE-TM based alloys without TM-TM exchange interactions.However, the strong Gd-Fe hybridization reduces the influence of vibronic couplings on the shortrange exchange interaction and thus allows a high Tc. The broadening or splitting mechanism of Gd 4f-electron bands is addressed based on crystal-field analysis and likely another factor for elevated Tc in Gd6FeBi2 and Gd-based compounds with non-magnetic elements. Different magnetic behaviors among isostructural compounds, and the relationship between the band splitting and crystal-field effects is also discussed.

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“…A brief survey of the known magnetic-ordering temperatures reveals that spontaneous magnetic ordering above room temperature within this structural family is realized only in Gd 6 FeBi 2 , which has been reported as a ferromagnet above room temperature (T C = 350 K; Zhang et al, 2016). Other known Gd analogues appear to have lower ferromagnetic transition temperatures, e.g.…”

Section: Introductionmentioning

confidence: 99%

Structural analysis of Gd₆FeBi₂ from single-crystal X-ray diffraction methods and electronic structure calculations

et al. 2019

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The crystal structure of the gadolinium iron bismuthide Gd 6 FeBi 2 has been characterized by single-crystal X-ray diffraction data and analyzed in detail using first-principles calculations. The structure is isotypic with the Zr 6 CoAl 2 structure, which is a variant of the ZrNiAl structure and its binary prototype Fe 2 P (Pearson code hP9, Wyckoff sequence g f d a). As such, the structure is best viewed as an array of tricapped trigonal prisms of Gd atoms centered alternately by Fe and Bi. The magnetic-ordering temperature of this compound (ca 350 K) is much higher than that of other rare-earth metal-rich phases with the same or related structures. It is also higher than the ordering temperature of many other Gd-rich ternary phases, where the magnetic exchange is typically governed by Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions. First-principles calculations reveal a larger than expected Gd magnetic moment, with the additional contribution arising from the Gd 5d electrons. The electronic structure analysis suggests strong Gd 5d-Fe 3d hybridization to be the cause of this effect, rather than weak interactions between Gd and Bi. These details are of importance for understanding the magnetic response and explaining the high ordering temperature in this material.

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Structure and magnetic behaviors of Gd 6 FeBi 2 compound

Cited by 11 publications

References 28 publications

Magnetocaloric and magnetoresistance properties in Co-based (Co_0.402Fe_0.201Ni_0.067B_0.227Si_0.053Nb_0.05)_100−xCu_x (x=0–1) glassy alloys

Magnetocaloric and magnetoresistance properties in Co-based (Co_0.402Fe_0.201Ni_0.067B_0.227Si_0.053Nb_0.05)_100−xCu_x (x=0–1) glassy alloys

Understanding high ordering temperature in Gd6FeBi2 magnet: Critical behavior, electronic structure and crystal-field analysis

Structural analysis of Gd₆FeBi₂ from single-crystal X-ray diffraction methods and electronic structure calculations

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Structure and magnetic behaviors of Gd 6 FeBi 2 compound

Cited by 11 publications

References 28 publications

Magnetocaloric and magnetoresistance properties in Co-based (Co0.402Fe0.201Ni0.067B0.227Si0.053Nb0.05)100−xCux (x=0–1) glassy alloys

Magnetocaloric and magnetoresistance properties in Co-based (Co0.402Fe0.201Ni0.067B0.227Si0.053Nb0.05)100−xCux (x=0–1) glassy alloys

Understanding high ordering temperature in Gd6FeBi2 magnet: Critical behavior, electronic structure and crystal-field analysis

Structural analysis of Gd6FeBi2 from single-crystal X-ray diffraction methods and electronic structure calculations

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Magnetocaloric and magnetoresistance properties in Co-based (Co_0.402Fe_0.201Ni_0.067B_0.227Si_0.053Nb_0.05)_100−xCu_x (x=0–1) glassy alloys

Magnetocaloric and magnetoresistance properties in Co-based (Co_0.402Fe_0.201Ni_0.067B_0.227Si_0.053Nb_0.05)_100−xCu_x (x=0–1) glassy alloys

Structural analysis of Gd₆FeBi₂ from single-crystal X-ray diffraction methods and electronic structure calculations