Phase equilibria in the Dy–Fe–In system and crystal structure of Dy6Fe1.72In

Demchyna, M.; Belan, B.; Manyako, Mykola; Akselrud, Lev; Gągor, Anna; Dzevenko, M.; Kalychak, Yaroslav M.

doi:10.1016/j.intermet.2013.01.010

Cited by 14 publications

(10 citation statements)

References 17 publications

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“…As predicted, the compound crystallizes in the CaIn 2 structure type. The final refinement was performed in the anisotropic approximation and led to the composition TbAg 0.46 (16) In 1.54 (16) , which agrees well with the nominal composition of the alloy and the results of the EDX analysis of a single crystal. The Tb atoms occupy the positions of the calcium atoms (2b) of the CaIn 2 type, whereas the Ag and In atoms statistically occupy the positions of the indium atoms (4f).…”

Section: Resultssupporting

confidence: 61%

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Structure of TbAg0.46In1.54 from single crystal data

Demchyna¹,

Belan²,

Manyako³

et al. 2013

Chem. Met. Alloys

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The TbAg 0.46 In 1.54 compound was prepared by arc-melting of pure metal ingots under an argon atmosphere. The crystal structure of TbAg 0.46(16) In 1.54(16) was refined from X-ray single crystal diffraction data: space group P6 3 /mmc, Pearson code hP6, Z = 2, a = 4.798(2), c = 7.341(2) Ǻ, R1 = 1.79%, wR2 = 4.40%. The title compound crystallizes in the CaIn 2 structure type with the 4f site occupied by a statistical mixture of Ag and In atoms.

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Section: Resultssupporting

confidence: 61%

“…Experimental details and results of the crystal structure determination are listed in Table 2. The refined atomic coordinates and displacement parameters of TbAg 0.46(16) In 1.54 (16) are listed in Table 3. Fig.…”

Section: Resultsmentioning

confidence: 99%

Structure of TbAg0.46In1.54 from single crystal data

Demchyna¹,

Belan²,

Manyako³

et al. 2013

Chem. Met. Alloys

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“…These structures are also characterized by dumbbells formed by the transition-metal component (Co−Co or Ni−Ni, with short distances of 2.2−2.3 Å), and sometimes there is a deficiency of these dumbbells, as occurs in Dy 6 Fe 1.7 In (Ho 6 Co 2 Ga-type). 22 What sets Gd 12 Co 5.3 Bi apart from these compounds is that it exhibits static disorder between Co−Co dumbbells and single Co atoms. This feature is reminiscent of other intermetallic compounds, such as RE 2 Fe 17 (containing Fe−Fe dumbbells and RE atoms) 23,24 and Fe 3 Ge 2 Sb (containing Sb−Sb dumbbells and Ge atoms) 25 in which the disorder occurs along channels running parallel to the c-direction in these hexagonal structures related to CaCu 5 .…”

Section: Resultsmentioning

confidence: 99%

Gd₁₂Co_5.3Bi and Gd₁₂Co₅Bi, Crystalline Doppelgänger with Low Thermal Conductivities

et al. 2016

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Attempts to prepare Gd12Co5Bi, a member of the rare-earth (RE) intermetallics RE12Co5Bi, which were identified by a machine-learning recommendation engine as potential candidates for thermoelectric materials, led instead to formation of the new compound Gd12Co5.3Bi with a very similar composition. Phase equilibria near the Gd-rich corner of the Gd-Co-Bi phase diagram were elucidated by both lab-based and variable-temperature synchrotron powder X-ray diffraction, suggesting that Gd12Co5.3Bi and Gd12Co5Bi are distinct phases. The higher symmetry structure of Gd12Co5.3Bi (cubic, space group Im3̅, Z = 2, a = 9.713(6) Å), as determined from single-crystal X-ray diffraction, is closely related to that of Gd12Co5Bi (tetragonal, space group Immm). Single Co atoms and Co-Co dumbbells are disordered with occupancies of 0.78(2) and 0.22(2), respectively, in Gd12Co5.3Bi, but they are ordered in Gd12Co5Bi. Consistent with this disorder, the electrical resistivity shows less dependence on temperature for Gd12Co5.3Bi than for Gd12Co5Bi. The thermal conductivity is low and reaches 2.8 W m(-1) K(-1) at 600 °C for both compounds; however, the temperature dependence of the thermal conductivity differs, decreasing for Gd12Co5.3Bi and increasing for Gd12Co5Bi as the temperature increases. The unusual trends in thermal properties persist in the heat capacity, which decreases below 2R, and in the thermal diffusivity, which increases at higher temperatures.

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“…In the past decade, a large number of MCE materials have been reported [14][15][16][17][18][19][20], among which rare-earth (RE) based alloys show great significance for MR applications at cryogenic temperatures. In particular, those crystallizing in orthorhombic Ho 6 Co 2 Ga-type structures (space group Immm) could exhibit both inverse (positive ΔS iso under magnetization process) and direct MCE (negative ΔS iso under magnetization process) despite showing peculiar and complex magnetic behavior [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36]. For example, S-shaped curves of magnetization versus magnetic field M(H) were reported for RE 6 Co x (Al/Sn) y (x = 2.2-2.5 and y = 0.5-0.8), whereby all of them adopted the Ho 6 Co 2 Ga-type structure [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

First- and second-order phase transitions in RE6Co2Ga (RE = Ho, Dy or Gd) cryogenic magnetocaloric materials

et al. 2021

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Rare-earth (RE) rich intermetallics crystallizing in orthorhombic Ho6Co2Ga-type crystal structure exhibit peculiar magnetic properties that are not widely reported for their magnetic ordering, order of magnetic phase transition, and related magnetocaloric behavior. By tuning the type of RE element in RE6Co2Ga (RE = Ho, Dy or Gd) compounds, metamagnetic anti-to-paramagnetic (AF to PM) phase transitions could be tuned to ferro-to-paramagnetic (FM to PM) phase transitions. Furthermore, the FM ground state for Gd6Co2Ga is confirmed by density functional theory calculations in addition to experimental observations. The field dependence magnetocaloric and Banerjee’s criteria demonstrate that Ho6Co2Ga and Dy6Co2Ga undergo a first-order phase transition in addition to a second-order phase transition, whereas only the latter is observed for Gd6Co2Ga. The two extreme alloys of the series, Ho6Co2Ga and Gd6Co2Ga, show maximum isothermal entropy change (∣ΔS iso max (5 T)∣) of 10.1 and 9.1 J kg−1K−1 at 26 and 75 K, close to H2 and N2 liquefaction, respectively. This outstanding magnetocaloric effect performance makes the RE6Co2Ga series of potential for cryogenic magnetic refrigeration applications.

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Phase equilibria in the Dy–Fe–In system and crystal structure of Dy6Fe1.72In

Cited by 14 publications

References 17 publications

Structure of TbAg0.46In1.54 from single crystal data

Structure of TbAg0.46In1.54 from single crystal data

Gd₁₂Co_5.3Bi and Gd₁₂Co₅Bi, Crystalline Doppelgänger with Low Thermal Conductivities

First- and second-order phase transitions in RE6Co2Ga (RE = Ho, Dy or Gd) cryogenic magnetocaloric materials

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Phase equilibria in the Dy–Fe–In system and crystal structure of Dy6Fe1.72In

Cited by 14 publications

References 17 publications

Structure of TbAg0.46In1.54 from single crystal data

Structure of TbAg0.46In1.54 from single crystal data

Gd12Co5.3Bi and Gd12Co5Bi, Crystalline Doppelgänger with Low Thermal Conductivities

First- and second-order phase transitions in RE6Co2Ga (RE = Ho, Dy or Gd) cryogenic magnetocaloric materials

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Gd₁₂Co_5.3Bi and Gd₁₂Co₅Bi, Crystalline Doppelgänger with Low Thermal Conductivities