Structure and properties of nanoporous FePt fabricated by dealloying a melt-spun Fe60Pt20B20 alloy and subsequent annealing

doi:10.1016/j.jmst.2019.05.066

Abstract

Abstract:

A nanoporous FePt alloy has been fabricated by dealloying a melt-spun Fe₆₀Pt₂₀B₂₀ alloy composed of nanoscale amorphous and face-centered-cubic FePt (fcc-FePt) phases in H₂SO₄ aqueous solution. The nanoporous alloy consists of single fcc-FePt phase with an Fe/Pt atomic ratio of about 55.3/44.7, and possesses a uniform interpenetrating ligament-channel structure with average ligament and pore sizes of 27 nm and 12 nm, respectively. The nanoporous fcc-FePt alloy shows soft magnetic characteristics with a saturation magnetization of 37.9 emu/g and better electrocatalytic activity for methanol oxidation than commercial Pt/C in acidic environment. The phase transformation from disordered fcc-FePt into ordered face-centered-tetragonal FePt (L1₀-FePt) in the nanoporous alloy has been realized after annealing at 823-943 K for 600 s. The volume fraction of the L1₀-FePt phase in the alloy increases with the rise of annealing temperature, which results in the enhancements of coercivity and saturation magnetization from 0.14 kOe and 38.5 emu/g to 8.42 kOe and 51.4 emu/g, respectively. The ligament size of the samples is increased after annealing.

Key words: Nanoporous metals, Fe-Pt-B alloy, Dealloying, L1₀-FePt, Magnetic property

Dianguo Ma, Yingmin Wang, Yanhui Li, Umetsu Rie Y., Shuli Ou, Kunio Yubuta, Wei Zhang. Structure and properties of nanoporous FePt fabricated by dealloying a melt-spun Fe₆₀Pt₂₀B₂₀ alloy and subsequent annealing[J]. J. Mater. Sci. Technol., 2020, 36: 128-133.

Figures/Tables 9

Fig. 1. XRD patterns (a) and bright-field TEM images of melt-spun Fe60Pt20B20 alloys before (b) and after (c) dealloying in 0.1 mol/L H2SO4 solution. Insets in (b) and (c) are the corresponding SAED patterns of the melt-spun and dealloyed samples, respectively.

Fig. 2. DSC curves of melt-spun Fe60Pt20B20 alloys before and after dealloying in 0.1 mol/L H2SO4 solution.

Fig. 3. Top-view (a) and cross-sectional (b, c) SEM images, and the corresponding EDX spectrum (d) of the Fe60Pt20B20 alloy dealloyed in 0.1 mol/L H2SO4 solution.

Fig. 4. (a) Cross-sectional SEM image, (b) EDX composition depth profile of the Fe60Pt20B20 alloy dealloyed in 0.1 mol/L H2SO4 solution for 600 s, and (c) EDX composition vs dealloying time plots showing the changes of Fe and Pt contents at the different stages.

Fig. 5. ECSA-normalized CV curves of the nanoporous fcc-FePt and Pt/C catalyst in (a) 0.5 mol/L H2SO4 and (b) 0.5 mol/L H2SO4 + 1.0 mol/L CH3OH solutions.

Fig. 6. XRD patterns of the nanoporous fcc-FePt alloy before and after annealing at 823-943 K for 600 s.

Fig. 7. SEM images of the nanoporous fcc-FePt alloy annealed at (a) 823 K, (b) 863 K, (c) 903 K and (d) 943 K for 600 s.

Table 1 The average ligament and pore sizes, coercivity (iHc), saturation magnetizations (Bs), remanence (Br), and remanence ratio (Br/Bs) of nanoporous fcc-FePt alloy annealed at 823-943 K for 600 s.

Annealing temp. (K)	Ligament size (nm)	Pore size (nm)	_iH_c (kOe)	B_s (emu/g)	B_r (emu/g)	B_r/B_s
dealloyed	27	12	-	37.9	-	-
823	31	16	0.14	38.5	9.8	0.25
863	46	17	0.37	38.8	14.4	0.37
903	52	17	2.10	41.1	27.5	0.67
943	60	16	8.42	51.4	41.0	0.80

Fig. 8. Hysteresis loops of the nanoporous fcc-FePt alloys annealed at 823-943 K for 600 s.

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Structure and properties of nanoporous FePt fabricated by dealloying a melt-spun Fe₆₀Pt₂₀B₂₀ alloy and subsequent annealing

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