Microstructure of Cu-added Pr-Fe-B magnets

Crystallization of antiferromagnetic Pr6Fe13Cu in the boundary region

Toshiyuki Kajitani, Katsuhisa Nagayama, Takateru Umeda

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The relations between microstructures and magnetic properties have been investigated in Pr17Fe76B5.5Cu1.5 magnets produced by a process of casting, hot-pressing and heat treatment. The crystallization of Pr6Fe13Cu during heat treatment at 753 K for 2 h increases the coercivity. This explains the enhancement of coercivity with the addition of small amounts of Cu. Pr6Fe13Cu has a tetragonal structure, space group 14/mcm, and lattice parameters a = b = 0.81 nm, c = 2.31 nm. Mössbauer spectroscopy and VSM measurements indicate that Pr6Fe13Cu is an antiferromagnetic compound with a Néel temperature of 391 K. Pr6Fe13Cu crystallizes in a peritectic reaction at 918 K, and is stable below that temperature. In Pr-Fe-B-Cu magnets, Pr6Fe13Cu is formed only within a low boron composition range (below 5.5 at%B). In the system Nd-Fe-Cu a compound Nd6Fe13Cu with the same crystal structure is observed.

Original languageEnglish
Pages (from-to)379-386
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Volume117
Issue number3
DOIs
Publication statusPublished - 1992
Externally publishedYes

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Crystallization
Coercive force
coercivity
Magnets
heat treatment
magnets
Heat treatment
crystallization
microstructure
Microstructure
Boron
hot pressing
Hot pressing
Lattice constants
lattice parameters
Magnetic properties
Casting
boron
Crystal structure
Spectroscopy

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Microstructure of Cu-added Pr-Fe-B magnets : Crystallization of antiferromagnetic Pr6Fe13Cu in the boundary region. / Kajitani, Toshiyuki; Nagayama, Katsuhisa; Umeda, Takateru.

In: Journal of Magnetism and Magnetic Materials, Vol. 117, No. 3, 1992, p. 379-386.

Research output: Contribution to journalArticle

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N2 - The relations between microstructures and magnetic properties have been investigated in Pr17Fe76B5.5Cu1.5 magnets produced by a process of casting, hot-pressing and heat treatment. The crystallization of Pr6Fe13Cu during heat treatment at 753 K for 2 h increases the coercivity. This explains the enhancement of coercivity with the addition of small amounts of Cu. Pr6Fe13Cu has a tetragonal structure, space group 14/mcm, and lattice parameters a = b = 0.81 nm, c = 2.31 nm. Mössbauer spectroscopy and VSM measurements indicate that Pr6Fe13Cu is an antiferromagnetic compound with a Néel temperature of 391 K. Pr6Fe13Cu crystallizes in a peritectic reaction at 918 K, and is stable below that temperature. In Pr-Fe-B-Cu magnets, Pr6Fe13Cu is formed only within a low boron composition range (below 5.5 at%B). In the system Nd-Fe-Cu a compound Nd6Fe13Cu with the same crystal structure is observed.

AB - The relations between microstructures and magnetic properties have been investigated in Pr17Fe76B5.5Cu1.5 magnets produced by a process of casting, hot-pressing and heat treatment. The crystallization of Pr6Fe13Cu during heat treatment at 753 K for 2 h increases the coercivity. This explains the enhancement of coercivity with the addition of small amounts of Cu. Pr6Fe13Cu has a tetragonal structure, space group 14/mcm, and lattice parameters a = b = 0.81 nm, c = 2.31 nm. Mössbauer spectroscopy and VSM measurements indicate that Pr6Fe13Cu is an antiferromagnetic compound with a Néel temperature of 391 K. Pr6Fe13Cu crystallizes in a peritectic reaction at 918 K, and is stable below that temperature. In Pr-Fe-B-Cu magnets, Pr6Fe13Cu is formed only within a low boron composition range (below 5.5 at%B). In the system Nd-Fe-Cu a compound Nd6Fe13Cu with the same crystal structure is observed.

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