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Title: Effects of Al and Fe solubility on the magnetofunctional properties of $$\mathrm{AlFe_2B_2}$$

Abstract

Bridgman single-crystal growth of $$\mathrm{AlFe_2B_2}$$ resulted in systematic Fe-Al lattice site substitution in the $$\mathrm{AlFe_2B_2 (Mn_2AlB_2}$$ -type structure, aka $$\mathrm{1 - 2 - 2}$$) phase along the direction of solidification. The Fe:Al ratio varied from 1.94 to 2.06. The $$\mathrm{1 - 2 - 2}$$ phase lattice parameters, magnetic transition temperatures ($$T_t$$) $$\mathrm{280 - 315}$$ K, magnetic entropy changes ($Δ S$) $$\mathrm{2.3 - 4.0 J / kg K}$$, heat capacity ($$C_p$$) $$\mathrm{117 - 147 J / mol K}$$, and thermal conductivity ($κ$) $$\mathrm{~ 2.4 - 11.5 W / m K}$$ all varied monotonically across the region of solubility. These findings confirm the sensitivity of the magnetic and thermal properties of the $$\mathrm{AlFe_2B_2}$$ compound to antisite defects. The interplay between Al and Fe lattice site occupancy and the resultant magnetic and electronic responses facilitates tailoring the properties of the $$\mathrm{AlFe_2B_2}$$ system for potential functional applications, including magnetic cooling.

Authors:
ORCiD logo [1];  [2];  [2];  [2];  [2];  [3]
  1. Northeastern Univ., Boston, MA (United States). Dept. of Chemical Engineering
  2. Ames Lab., Ames, IA (United States). Division of Materials Science and Engineering
  3. Northeastern Univ., Boston, MA (United States). Dept. of Chemical Engineering and Dept. of Mechanical and Industrial Engineering
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1571457
Report Number(s):
IS-J-10059
Journal ID: ISSN 2475-9953; PRMHAR
Grant/Contract Number:  
AR00000754; SC0014664; AC02-07CH11358
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 9; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Lejeune, B. T., Schlagel, D. L., Jensen, B. A., Lograsso, T. A., Kramer, M. J., and Lewis, L. H. Effects of Al and Fe solubility on the magnetofunctional properties of $\mathrm{AlFe_2B_2}$. United States: N. p., 2019. Web. doi:10.1103/PhysRevMaterials.3.094411.
Lejeune, B. T., Schlagel, D. L., Jensen, B. A., Lograsso, T. A., Kramer, M. J., & Lewis, L. H. Effects of Al and Fe solubility on the magnetofunctional properties of $\mathrm{AlFe_2B_2}$. United States. doi:10.1103/PhysRevMaterials.3.094411.
Lejeune, B. T., Schlagel, D. L., Jensen, B. A., Lograsso, T. A., Kramer, M. J., and Lewis, L. H. Mon . "Effects of Al and Fe solubility on the magnetofunctional properties of $\mathrm{AlFe_2B_2}$". United States. doi:10.1103/PhysRevMaterials.3.094411.
@article{osti_1571457,
title = {Effects of Al and Fe solubility on the magnetofunctional properties of $\mathrm{AlFe_2B_2}$},
author = {Lejeune, B. T. and Schlagel, D. L. and Jensen, B. A. and Lograsso, T. A. and Kramer, M. J. and Lewis, L. H.},
abstractNote = {Bridgman single-crystal growth of $\mathrm{AlFe_2B_2}$ resulted in systematic Fe-Al lattice site substitution in the $\mathrm{AlFe_2B_2 (Mn_2AlB_2}$ -type structure, aka $\mathrm{1 - 2 - 2}$) phase along the direction of solidification. The Fe:Al ratio varied from 1.94 to 2.06. The $\mathrm{1 - 2 - 2}$ phase lattice parameters, magnetic transition temperatures ($T_t$) $\mathrm{280 - 315}$ K, magnetic entropy changes ($Δ S$) $\mathrm{2.3 - 4.0 J / kg K}$, heat capacity ($C_p$) $\mathrm{117 - 147 J / mol K}$, and thermal conductivity ($κ$) $\mathrm{~ 2.4 - 11.5 W / m K}$ all varied monotonically across the region of solubility. These findings confirm the sensitivity of the magnetic and thermal properties of the $\mathrm{AlFe_2B_2}$ compound to antisite defects. The interplay between Al and Fe lattice site occupancy and the resultant magnetic and electronic responses facilitates tailoring the properties of the $\mathrm{AlFe_2B_2}$ system for potential functional applications, including magnetic cooling.},
doi = {10.1103/PhysRevMaterials.3.094411},
journal = {Physical Review Materials},
number = 9,
volume = 3,
place = {United States},
year = {2019},
month = {9}
}

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