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Title: Effects of Al content and annealing on the phases formation, lattice parameters, and magnetization of A l x F e 2 B 2 ( x = 1.0 , 1.1 , 1.2 ) alloys

Journal Article · · Physical Review Materials
 [1];  [2];  [3];  [3];  [2];  [4];  [5];  [3]
  1. Ames Lab., Ames, IA (United States). Division of Materials Sciences and Engineering; Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  2. Ames Lab., Ames, IA (United States). Division of Materials Sciences and Engineering
  3. Northeastern Univ., Boston, MA (United States). Dept. of Mechanical Engineering
  4. McCallum Consulting LLC, Santa Fe, NM (United States)
  5. Ames Lab., Ames, IA (United States). Division of Materials Sciences and Engineering; Iowa State Univ., Ames, IA (United States). Dept. of Materials Sciences and Engineering
+ Show Author Affiliations

AlFe2B2 is a ferromagnet with the Curie temperature around 300 K and has the potential to be an outstanding rare-earth free candidate for magnetocaloric applications. However, samples prepared from the melt contain additional phases which affect the functional response of the AlFe2B2 phase. Here, we report on the effects of Al content in samples with the initial (nominal) composition of AlxFe2B2 where x=1.0, 1.1, and 1.2 prepared by arc-melting followed by suction casting and annealing. The as-cast AlxFe2B2 alloys contain AlFe2B2 as well as additional phases including the primary solidifying FeB and Al13Fe4 compounds which are ferromagnetic and paramagnetic, respectively, at 300 K. The presence of these phases makes it difficult to extract the intrinsic magnetic properties of AlFe2B2 phase. Annealing of AlxFe2B2 alloys at 1040°C for 3 days allows for reaction of the FeB with Al13Fe4 to form the AlFe2B2 phase, significantly reduces the amount of additional phases, and results in nearly pure AlFe2B2 phase as confirmed with XRD, magnetization, scanning electron microscopy, and electronic transport. The values of the magnetization, effective magnetic moment per Fe atom, specific heat capacity, electrical resistivity and Seebeck coefficient for the AlFe2B2 compound have been established.

Research Organization:
Ames Lab., and Iowa State Univ., Ames, IA (United States); Northeastern Univ., Boston, MA (United States)
Sponsoring Organization:
USDOE Advanced Research Projects Agency - Energy (ARPA-E)
Grant/Contract Number:
AR0000754; AC02-07CH11358
OSTI ID:
1431221
Alternate ID(s):
OSTI ID: 1429563
Report Number(s):
IS-J-9621; PRMHAR
Journal Information:
Physical Review Materials, Vol. 2, Issue 3; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

References (23)

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Cited By (4)

Anisotropic thermal expansions of select layered ternary transition metal borides: MoAlB, Cr 2 AlB 2 , Mn 2 AlB 2 , and Fe 2 AlB 2 journal November 2018
A progress report on the MAB phases: atomically laminated, ternary transition metal borides text January 2019
A progress report on the MAB phases: atomically laminated, ternary transition metal borides text January 2019
A progress report on the MAB phases: atomically laminated, ternary transition metal borides journal July 2019

Figures / Tables (12)

FIG. 1.(p. 19)figure FIG. 1.
FIG. 2.(p. 20)figure FIG. 2.
FIG. 3.(p. 21)figure FIG. 3.
FIG. 4.(p. 22)figure FIG. 4.
FIG. 5.(p. 23)figure FIG. 5.
FIG. 6.(p. 24)figure FIG. 6.
FIG. 7.(p. 25)figure FIG. 7.
FIG. 8.(p. 26)figure FIG. 8.
FIG. 9.(p. 27)figure FIG. 9.
FIG. 10.(p. 28)figure FIG. 10.
Table 1(p. 29)table Table 1
Table 2(p. 30)table Table 2

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Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AlxFe2B2 alloys
suction casting
annealing
XRD
lattice parameters
SEM
EDS
DSC
magnetization
heat capacity
electrical resistivity
Seebeck coefficient