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:
-
- Northeastern Univ., Boston, MA (United States). Dept. of Chemical Engineering
- Ames Lab., Ames, IA (United States). Division of Materials Science and Engineering
- Northeastern Univ., Boston, MA (United States). Dept. of Chemical Engineering and Dept. of Mechanical and Industrial Engineering
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1571457
- Report Number(s):
- IS-J-10059
Journal ID: ISSN 2475-9953; PRMHAR; TRN: US2100207
- 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. https://doi.org/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. https://doi.org/10.1103/PhysRevMaterials.3.094411. https://www.osti.gov/servlets/purl/1571457.
@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}
}
Web of Science
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