Microstructure of Cu-added Pr-Fe-B magnets: Crystallization of antiferromagnetic Pr6Fe13Cu in the boundary region

Toshiyuki Kajitani; Katsuhisa Nagayama; Takateru Umeda

doi:10.1016/0304-8853(92)90093-4

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 journal › Article › peer-review

39 Citations (Scopus)

Abstract

The relations between microstructures and magnetic properties have been investigated in Pr₁₇Fe₇₆B_5.5Cu_1.5 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 language	English
Pages (from-to)	379-386
Number of pages	8
Journal	Journal of Magnetism and Magnetic Materials
Volume	117
Issue number	3
DOIs	https://doi.org/10.1016/0304-8853(92)90093-4
Publication status	Published - 1992 Dec
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Microstructure of Cu-added Pr-Fe-B magnets: Crystallization of antiferromagnetic Pr6Fe13Cu in the boundary region",

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. M{\"o}ssbauer spectroscopy and VSM measurements indicate that Pr6Fe13Cu is an antiferromagnetic compound with a N{\'e}el 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.",

author = "Toshiyuki Kajitani and Katsuhisa Nagayama and Takateru Umeda",

year = "1992",

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doi = "10.1016/0304-8853(92)90093-4",

language = "English",

volume = "117",

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T1 - Microstructure of Cu-added Pr-Fe-B magnets

T2 - Crystallization of antiferromagnetic Pr6Fe13Cu in the boundary region

AU - Kajitani, Toshiyuki

AU - Nagayama, Katsuhisa

AU - Umeda, Takateru

PY - 1992/12

Y1 - 1992/12

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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Microstructure of Cu-added Pr-Fe-B magnets: Crystallization of antiferromagnetic Pr₆Fe₁₃Cu in the boundary region

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