자장중 열처리에 의한 Nd2Fe14B/Fe3B 초미세립의 뫼스바우어

목차

I. INTRODUCTION

II. EXPERIMENTAL

III. RESULTS AND DISCUSSION

A. Magnetic Properties of Melt-spun Ribbons after Magnetic Annealing

B. The result of M ssbauer spectroscopy

본문내용

selected area diffraction pattern.
Fig. 3 Mossbauer spectra at room temperature for Nd4Fe73.5Co3Hf0.5Ga0.5B18.5 alloys annealed at 680 ℃ for 5 minutes.
Fig. 4 Resolved Mossbauer curve fits of each atomic site in the alloys (a) annealed without a magnetic field, and (b) with a magnetic field.
Fig. 5 Variation of reduced remanence(Mr/Ms) of the melt-spun Nd4Fe73.5Co3Hf0.5Ga0.5B18.5 (x=0, 0.5, 1) ribbons as a function of annealing temperature with and without a magnetic field.
Fig. 6 Variation of magnetic properties of the melt-spun Nd4Fe73.5Co3Hf0.5Ga0.5B18.5 (x=0, 0.5, 1) ribbons as a function of annealing temperature with and without a magnetic field.
Table I The result of Mossbauer spectroscopy
Table I
phase/site
HF
(T)
I.S
(mm/sec)
Q.D
(mm/sec)
Vol. fraction
(%)
α-Fe
without
field
33.43
-0.114
0.010
18.94
with field
33.85
-0.116
0.009
6.22
bct Fe3B
Fe(Ⅰ)(8g)
without
field
28.43
-0.046
-0.012
67.21
82.08
with
field
28.99
-0.037
-0.015
bct Fe3B
Fe(Ⅱ)(8g)
without
field
26.45
-0.122
0.042
with
field
26.98
-0.103
0.046
bct Fe3B
Fe(Ⅲ)(8g)
without
field
22.12
-0.0301
0.021
with field
22.52
-0.027
0.023
Nd2Fe14B Fe(8j2)
without
field
34.73
-0.033
0.310
13.854
11.72
with field
34.51
-0.032
0.303
Nd2Fe14B Fe(16k1,4e)
without field
28.21
-0.165
0.121
with field
28.51
-0.182
0.120
Nd2Fe14B Fe(16k2,4c)
without
field
29.41
-0.192
0.071
with field
30.21
-0.161
0.082
Nd2Fe14B Fe(8j1)
without
field
25.82
-0.192
0.033
with field
25.80
-0.194
0.03
The result of Mossbauer spectroscopy

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자장중 열처리,   뫼스바우어