The effect of addition Cu on the appearance of formation ability and high coercivity for Nd-Fe metastable phase by using short drop tube process

Hiroki Kawamura, Katsuhisa Nagayama

Research output: Contribution to journalArticle

Abstract

We have previously reported the undercooling solidification behavior and high coercivity(Hc) of the Nd-Fe-based metastable phase using various containerless processes. However, the mechanism of high coercivity of the metastable phase is unclear. In this study, we have intended to examine the effect of Cu addition on the formation and high coercivity of Nd-Fe-based metastable phase using close to the stoichiometric composition of the Nd60Fe40 binary alloy. In addition, we have analyzed the relationship between high coercivity and the 3d-4f valence electron state by X-ray photoelectron spectroscopy (XPS) analysis. The Nd-Fe-Cu ternary particle samples were found to solidify by the drop tube process. The coercivity which was 5.8×103 Oe, increased by about two fold after Cu addition. X-ray diffraction (XRD) results showed that crystallization of the a-Nd phase was markedly suppressed in the Nd60Fe25Cu15 ternary particle samples. This is attributed to the increased production of the metastable phase by addition of Cu. The effectiveness of Cu addition on the formation of the metastable phase is suggested for this purpose. Using energy-dispersive X-ray analysis (EDS), the Nd-Fe-Cu ternary metastable phase composition ratio was found to be very similar to that of the Nd60Fe25Cu15 ternary based material (Nd:Fe:Cu=12:5:3). From the XPS result for the Nd60Fe40 binary and Nd60Fe25Cu15 ternary particle samples, the 3d-4f bonding energy shifted to lower energy by Cu addition. Therefore, it is suggested that high coercivity depends on the increase of the 3d-4f electron bonding energy strength by the addition of Cu.

Original languageEnglish
Pages (from-to)268-272
Number of pages5
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume80
Issue number4
DOIs
Publication statusPublished - 2016

Fingerprint

drop towers
Metastable phases
Coercive force
coercivity
x rays
X ray photoelectron spectroscopy
photoelectron spectroscopy
Undercooling
energy
Energy dispersive X ray analysis
Binary alloys
supercooling
binary alloys
Crystallization
electron states
Phase composition
Electron energy levels
solidification
Solidification
Energy dispersive spectroscopy

Keywords

  • 3d-4f valence electron state
  • Droptube
  • High coercivity
  • Metastable phase
  • Neodymium-iron alloy
  • X-ray photoelectron spectroscopy (XPS) analysis

ASJC Scopus subject areas

  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys
  • Condensed Matter Physics

Cite this

@article{dd0ce465eca84f3aba10fa4d6e400b6c,
title = "The effect of addition Cu on the appearance of formation ability and high coercivity for Nd-Fe metastable phase by using short drop tube process",
abstract = "We have previously reported the undercooling solidification behavior and high coercivity(Hc) of the Nd-Fe-based metastable phase using various containerless processes. However, the mechanism of high coercivity of the metastable phase is unclear. In this study, we have intended to examine the effect of Cu addition on the formation and high coercivity of Nd-Fe-based metastable phase using close to the stoichiometric composition of the Nd60Fe40 binary alloy. In addition, we have analyzed the relationship between high coercivity and the 3d-4f valence electron state by X-ray photoelectron spectroscopy (XPS) analysis. The Nd-Fe-Cu ternary particle samples were found to solidify by the drop tube process. The coercivity which was 5.8×103 Oe, increased by about two fold after Cu addition. X-ray diffraction (XRD) results showed that crystallization of the a-Nd phase was markedly suppressed in the Nd60Fe25Cu15 ternary particle samples. This is attributed to the increased production of the metastable phase by addition of Cu. The effectiveness of Cu addition on the formation of the metastable phase is suggested for this purpose. Using energy-dispersive X-ray analysis (EDS), the Nd-Fe-Cu ternary metastable phase composition ratio was found to be very similar to that of the Nd60Fe25Cu15 ternary based material (Nd:Fe:Cu=12:5:3). From the XPS result for the Nd60Fe40 binary and Nd60Fe25Cu15 ternary particle samples, the 3d-4f bonding energy shifted to lower energy by Cu addition. Therefore, it is suggested that high coercivity depends on the increase of the 3d-4f electron bonding energy strength by the addition of Cu.",
keywords = "3d-4f valence electron state, Droptube, High coercivity, Metastable phase, Neodymium-iron alloy, X-ray photoelectron spectroscopy (XPS) analysis",
author = "Hiroki Kawamura and Katsuhisa Nagayama",
year = "2016",
doi = "10.2320/jinstmet.JBW201509",
language = "English",
volume = "80",
pages = "268--272",
journal = "Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals",
issn = "0021-4876",
publisher = "Japan Institute of Metals (JIM)",
number = "4",

}

TY - JOUR

T1 - The effect of addition Cu on the appearance of formation ability and high coercivity for Nd-Fe metastable phase by using short drop tube process

AU - Kawamura, Hiroki

AU - Nagayama, Katsuhisa

PY - 2016

Y1 - 2016

N2 - We have previously reported the undercooling solidification behavior and high coercivity(Hc) of the Nd-Fe-based metastable phase using various containerless processes. However, the mechanism of high coercivity of the metastable phase is unclear. In this study, we have intended to examine the effect of Cu addition on the formation and high coercivity of Nd-Fe-based metastable phase using close to the stoichiometric composition of the Nd60Fe40 binary alloy. In addition, we have analyzed the relationship between high coercivity and the 3d-4f valence electron state by X-ray photoelectron spectroscopy (XPS) analysis. The Nd-Fe-Cu ternary particle samples were found to solidify by the drop tube process. The coercivity which was 5.8×103 Oe, increased by about two fold after Cu addition. X-ray diffraction (XRD) results showed that crystallization of the a-Nd phase was markedly suppressed in the Nd60Fe25Cu15 ternary particle samples. This is attributed to the increased production of the metastable phase by addition of Cu. The effectiveness of Cu addition on the formation of the metastable phase is suggested for this purpose. Using energy-dispersive X-ray analysis (EDS), the Nd-Fe-Cu ternary metastable phase composition ratio was found to be very similar to that of the Nd60Fe25Cu15 ternary based material (Nd:Fe:Cu=12:5:3). From the XPS result for the Nd60Fe40 binary and Nd60Fe25Cu15 ternary particle samples, the 3d-4f bonding energy shifted to lower energy by Cu addition. Therefore, it is suggested that high coercivity depends on the increase of the 3d-4f electron bonding energy strength by the addition of Cu.

AB - We have previously reported the undercooling solidification behavior and high coercivity(Hc) of the Nd-Fe-based metastable phase using various containerless processes. However, the mechanism of high coercivity of the metastable phase is unclear. In this study, we have intended to examine the effect of Cu addition on the formation and high coercivity of Nd-Fe-based metastable phase using close to the stoichiometric composition of the Nd60Fe40 binary alloy. In addition, we have analyzed the relationship between high coercivity and the 3d-4f valence electron state by X-ray photoelectron spectroscopy (XPS) analysis. The Nd-Fe-Cu ternary particle samples were found to solidify by the drop tube process. The coercivity which was 5.8×103 Oe, increased by about two fold after Cu addition. X-ray diffraction (XRD) results showed that crystallization of the a-Nd phase was markedly suppressed in the Nd60Fe25Cu15 ternary particle samples. This is attributed to the increased production of the metastable phase by addition of Cu. The effectiveness of Cu addition on the formation of the metastable phase is suggested for this purpose. Using energy-dispersive X-ray analysis (EDS), the Nd-Fe-Cu ternary metastable phase composition ratio was found to be very similar to that of the Nd60Fe25Cu15 ternary based material (Nd:Fe:Cu=12:5:3). From the XPS result for the Nd60Fe40 binary and Nd60Fe25Cu15 ternary particle samples, the 3d-4f bonding energy shifted to lower energy by Cu addition. Therefore, it is suggested that high coercivity depends on the increase of the 3d-4f electron bonding energy strength by the addition of Cu.

KW - 3d-4f valence electron state

KW - Droptube

KW - High coercivity

KW - Metastable phase

KW - Neodymium-iron alloy

KW - X-ray photoelectron spectroscopy (XPS) analysis

UR - http://www.scopus.com/inward/record.url?scp=84964664651&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84964664651&partnerID=8YFLogxK

U2 - 10.2320/jinstmet.JBW201509

DO - 10.2320/jinstmet.JBW201509

M3 - Article

AN - SCOPUS:84964664651

VL - 80

SP - 268

EP - 272

JO - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

JF - Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals

SN - 0021-4876

IS - 4

ER -