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

Dianguo Ma; Yingmin Wang; Yanhui Li; Rie Y. Umetsu; Shuli Ou; Kunio Yubuta; Wei Zhang

doi:10.1016/j.jmst.2019.05.066

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

Dianguo Ma, Yingmin Wang, Yanhui Li, Rie Y. Umetsu, Shuli Ou, Kunio Yubuta, Wei Zhang

IMR - Cooperative Research and Development Center for Advanced Materials

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

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.

Original language	English
Pages (from-to)	128-133
Number of pages	6
Journal	Journal of Materials Science and Technology
Volume	36
DOIs	https://doi.org/10.1016/j.jmst.2019.05.066
Publication status	Published - 2020 Jan 1

Keywords

Dealloying
Fe-Pt-B alloy
L1-FePt
Magnetic property
Nanoporous metals

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10.1016/j.jmst.2019.05.066

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@article{2fab5dfeac4048cea837787c38863a44,

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

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.",

keywords = "Dealloying, Fe-Pt-B alloy, L1-FePt, Magnetic property, Nanoporous metals",

author = "Dianguo Ma and Yingmin Wang and Yanhui Li and Umetsu, {Rie Y.} and Shuli Ou and Kunio Yubuta and Wei Zhang",

note = "Funding Information: This work was supported financially by the National Natural Science Foundation of China (Grant Nos. 51571047 , 51171034 ), the Fundamental Research Funds for the Central Universities ( DUT17ZD212 ), and the Global Institute for Materials Research Tohoku Program, Japan . Funding Information: This work was supported financially by the National Natural Science Foundation of China (Grant Nos. 51571047, 51171034), the Fundamental Research Funds for the Central Universities (DUT17ZD212), and the Global Institute for Materials Research Tohoku Program, Japan. Publisher Copyright: {\textcopyright} 2019",

year = "2020",

month = jan,

day = "1",

doi = "10.1016/j.jmst.2019.05.066",

language = "English",

volume = "36",

pages = "128--133",

journal = "Journal of Materials Science and Technology",

issn = "1005-0302",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Structure and properties of nanoporous FePt fabricated by dealloying a melt-spun Fe60Pt20B20 alloy and subsequent annealing

AU - Ma, Dianguo

AU - Wang, Yingmin

AU - Li, Yanhui

AU - Umetsu, Rie Y.

AU - Ou, Shuli

AU - Yubuta, Kunio

AU - Zhang, Wei

N1 - Funding Information: This work was supported financially by the National Natural Science Foundation of China (Grant Nos. 51571047 , 51171034 ), the Fundamental Research Funds for the Central Universities ( DUT17ZD212 ), and the Global Institute for Materials Research Tohoku Program, Japan . Funding Information: This work was supported financially by the National Natural Science Foundation of China (Grant Nos. 51571047, 51171034), the Fundamental Research Funds for the Central Universities (DUT17ZD212), and the Global Institute for Materials Research Tohoku Program, Japan. Publisher Copyright: © 2019

PY - 2020/1/1

Y1 - 2020/1/1

N2 - 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.

AB - 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.

KW - Dealloying

KW - Fe-Pt-B alloy

KW - L1-FePt

KW - Magnetic property

KW - Nanoporous metals

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U2 - 10.1016/j.jmst.2019.05.066

DO - 10.1016/j.jmst.2019.05.066

M3 - Article

AN - SCOPUS:85075511735

SN - 1005-0302

VL - 36

SP - 128

EP - 133

JO - Journal of Materials Science and Technology

JF - Journal of Materials Science and Technology

ER -

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

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Keywords

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