TY - JOUR
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
N1 - Funding Information:
The authors thank Professor H. Ino and Messrs.K . Besshoa nd K. Higashi for thee xperi-ments and discussions of M6ssbauer spectroscopy,a nd Dr. T. Shimoda and Messrs. O. Kobayashia nd A. Arai for sample preparation and fruitful discussionsT. his work was partly supportedb y Grant-in-Aid for Scientific Research( A) under contracNt o. 02402046.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.
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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U2 - 10.1016/0304-8853(92)90093-4
DO - 10.1016/0304-8853(92)90093-4
M3 - Article
AN - SCOPUS:0026961123
VL - 117
SP - 379
EP - 386
JO - Journal of Magnetism and Magnetic Materials
JF - Journal of Magnetism and Magnetic Materials
SN - 0304-8853
IS - 3
ER -