Ga site occupancy in HDDR-treated Nd2Fe14B-based alloy by XAFS

被引：4

作者：

Matsuura, M ^{[1
]}

Ashfaq, A

Sakurai, M

Tomida, T

Sano, N

Hirosawa, S

机构：

[1] Miyagi Natl Coll Technol, Natori, Miyagi 9811239, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 980, Japan

[3] Sumitomo Met Ind Ltd, Amagasaki, Hyogo 660, Japan

[4] Sumitomo Special Met Co Ltd, Shimamoto, Osaka 618, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 1999年 / 293卷

关键词：

Nd2Fe14B; HDDR; XAFS; site occupancy; Ga-additive;

D O I：

10.1016/S0925-8388(99)00381-3

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The changes of local structure far Ga in Nd13.0Fe68.2Co10.8Ga1.0Zr0.1B6.9 during hydrogenation, disproportionation, desorption and recombination (HDDR) process are studied by fluorescence XAFS in order to understand the evolution of magnetic anisotropy by HDDR process. Comparing the observed Ga XAFS data with the calculated ones, using ab initio calculation (FEEF), Ga is proved to occupy preferentially an Fe(c) site in the Nd2Fe14B structure before disproportionation and dissolves in alpha-Fe after the disproportionation. In the recombined state Ga redistributes into two phases, i.e. Nd2Fe14B and a Nd-rich phase. The behavior of Ga during the HDDR process differs from Zr which occupies Fe(j(2)) sites before disproportionation and after the disproportionation. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：872 / 876

页数：5

共 16 条

[1] Site occupancy of Zr in Nd(FeZr)B magnet during hydrogenation disproportionation desorption recombination process
Ashfaq, A
Matsuura, M
Sakurai, M
[J]. APPLIED PHYSICS LETTERS, 1998, 73 (17) : 2512 - 2514
[2] NEW DEVELOPMENTS IN HARD MAGNETIC-MATERIALS
BUSCHOW, KHJ
[J]. REPORTS ON PROGRESS IN PHYSICS, 1991, 54 (09) : 1123 - 1213
[3] HARRIS IR, 1992, P 12 INT WORKSH RAR, P327
[4] RELATIONSHIPS BETWEEN CRYSTAL-STRUCTURE AND MAGNETIC-PROPERTIES IN ND2FE14B
HERBST, JF
CROAT, JJ
PINKERTON, FE
YELON, WB
[J]. PHYSICAL REVIEW B, 1984, 29 (07): : 4176 - 4178
[5] HIROSAWA S, COMMUNICATION
[6] LOCAL-STRUCTURE CHANGES OF GA DURING NANOCRYSTALLINE FORMATION FROM MELT-QUENCHED FE73GA4NB3SI11B9 ALLOYS
MATSUURA, M
SAKURAI, M
KIM, SH
SUZUKI, K
TOMIDA, T
[J]. JOURNAL OF PHYSICS-CONDENSED MATTER, 1995, 7 (35) : 7087 - 7097
[7] ND-FE-B ANISOTROPIC MAGNET POWDERS PRODUCED BY THE HDDR PROCESS
NAKAYAMA, R
TAKESHITA, T
[J]. JOURNAL OF ALLOYS AND COMPOUNDS, 1993, 193 (1-2) : 259 - 261
[8] NEWVILLE M, 1995, PROGRAM AUTOBK VER 2
[9] NEUTRON-DIFFRACTION AND MOSSBAUER STUDIES OF GA SITE PREFERENCE IN ND2FE14B AND FE INTERNAL-FIELD ASSIGNMENTS
QUAN, CR
ZHAO, JG
WANG, YZ
YIN, L
SHEN, BG
CHENG, ZX
CHENG, YF
NIU, SW
[J]. PHYSICAL REVIEW B, 1990, 42 (10): : 6697 - 6699
[10] REHR JJ, 1991, PHYS REV B, V44, P4146

← 1 2 →