MÖSSBAUER SPECTRUM OF 119Sn DISSOLVED IN Al

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MÖSSBAUER SPECTRUM OF 119Sn DISSOLVED IN Al

S. Umeyama, M. Taniwaki, Y. Ishida, M. Kato

To cite this version:

S. Umeyama, M. Taniwaki, Y. Ishida, M. Kato. MÖSSBAUER SPECTRUM OF 119Sn DISSOLVED IN Al. Journal de Physique Colloques, 1979, 40 (C2), pp.C2-539-C2-541. �10.1051/jphyscol:19792186�.

�jpa-00218563�

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JOURNAL DE PHYSIQUE

Colloque C2, suppl6ment au no 3, Tome 40, mars 1979, page (2-539

MOSSBAUER SPECTRUM OF I 1 9 S n DISSOLVED IN A 1

S. Umeyama, M. Taniwaki, Y . I s h i d a and M. Kato

I n s t i t u t e of I n d u s t r i a l Science, University o f Tokyo,

7

Roppongi, Minato, Tokyo,

Japan.

R6sumd.- Des a l l i a g e s A1-Sn s o n t t r a i t d s thermiquement e t l e s v a r i a t i o n s c o r r e s p o n d a n t e s d e s spec- t r e s Miissbauer s o n t a n a l y s d e s . On e n d d d u i t que l a r a i e a t t r i b u a b l e ii " ' ~ n e n s o l u t i o n s o l i d e d a n s A1 s e t r o u v e 1 2,32 mm/s e t que l a t e m p e r a t u r e de Debye e f f e c t i v e e s t 173 K. Le s p e c t r e d e " ' ~ n d a n s d e s c l u s t e r s d'atome d e Sn e t d e l a c u n e s e s t dgalement o b t e n u 1 p a r t i r d ' a l l i a g e s t r e m p s s . A b s t r a c t . - AI-Sn a l l o y s a r e h e a t - t r e a t e d and changes o f M&sbauer s p e c t r u m a r e a n a l y z e d . I t i s deduced t h a t t h e l i n e p o s i t i o n o f l l ' s n i n s o l i d s o l u t i o n i n A1 i s 2.32 1mn1s and t h e e f f e c t i v e Debye t e m p e r a t u r e i s 173 K. The s p e c t r u m of " ' ~ n i n t h e c l u s t e r s c o n s i s t i n g o f v a c a n c i e s and Sn atoms is a l s o deduced from t h e a n a l y s i s of t h e quenched a l l o y .

l . I n t r o d u c t i o n . - Mgssbauer s p e c t r o s c o p y i s t h e use- f u l t e c h n i q u e f o r t h e s t u d y of p o i n t d e f e c t i n me- t a l s . It p r o v i d e s i n f o r m a t i o n s o f l o c a l e l e c t r o n i c s t r u c t u r e and l a t t i c e dynamical p r o p e r t i e s a r o u n d t h e p o i n t d e f e c t . The c o n c e n t r a t i o n of p o i n t d e f e c t i n m e t a l s i s n o r m a l l y s m a l l t o b e d e t e c t e d . Most i n v e s t i g a t i o n s u s e ~ a s s b a u e r atoms a s i m p u r i t y i n m e t a l s . The i n t e r a c t i o n between i m p u r i t y atoms and p o i n t d e f e c t s i n c r e a s e s t h e c o n c e n t r a t i o n o f l a t t e r around t h e G s s b a u e r atoms. Many s t u d i e s have b e e n r e p o r t e d on t h e i n t e r a c t i o n between 5 7 ~ e / 5 7 ~ o and p o i n t d e f e c t i n A l . 11-51. While few r e p o r t have a p p e a r e d on " ' ~ n . SBrensen and C o t t e r i l l s t u d i e d t h e s p e c t r u m o f t h e " ' ~ n i n AI-Sn a l l o y s 161, b u t t h e i r r e s u l t s a r e n o t v e r y c o n c l u s i v e . T i n impuri- t y i n A1 i s more i n t e r e s t i n g t h a n Fe o r CO; a l a r g e b i n d i n g e n e r g y h a s been r e p o r t e d between Sn and vacancy i n Al. 171. It h a s been c l a i m e d t h a t t h e e f f e c t o f Sn i m p u r i t i e s on t h e a g i n g p r o c e s s o f A1 a l l o y s was c a u s e d by t h i s l a r g e b i n d i n g e n e r g y 181.

2. Experimenta1s.- Specimens were p r e p a r e d from 99.999ZAl and 80% e n r i c h e d l l 9 s n . A l l o y s c o n t a i n i n g

1 x 1 0 - ~

-

5x10-' Sn were used f o r t h e s t u d y of con- c e n t r a t i o n dependence o f t h e spectrum. S h e e t specimens Im t h i c k n e s s were a i r - c o o l e d o r quenched fkom 873 K. An a n n e a l i n g e x p e r i m e n t was made up t o 453 K u s i n g t h e quenched a l l o y c o n t a i n i n g 2 . 5 x 1 0 - ~ Sn. A l l measurements o f t h e s e specimens were per- formed a t 1 i q . N ~ te m p e r a t u r e . F o r t h e s t u d y o f l a t t i c e dynamical p r o p e r t i e s , t e m p e r a t u r e dependen- c e o f t h e s p e c t r u m was measured from liq.Nz tempera- t u r e up t o room t e m p e r a t u r e on t h e a i r - c o o l e d s p e c i - men and up t o 200 K on t h e quenched specimen. Spe- cimen t e m p e r a t u r e was c o n t r o l l e d u s i n g a s m a l l h e a t e r i n t h e c r y o s t a t .

G s s b a u e r s p e c t r u m was measured b y o r d i n a r y c o n s t a n t a c c e l e r a t i o n t y p e s p e c t r o m e t e r u s i n g t h e CaSnO, s o u r c e a t room t e m p e r a t u r e . O b t a i n e d s p e c t r a were i n i t i a l l y a n a l y z e d by s i n g l e L o r e n t z i a n l i n e .

I n c a s e t h a t f i t t i n g was n o t s a t i s f a c t o r y , superpo- s i t i o n o f l i n e s was assumed.

3 . R e s u l t s and d i s c u s s i o n . - F i g u r e 1 shows t h e ty- p i c a l s p e c t r a , s o l i d l i n e s a r e t h e b e s t f i t t e d Lo- r e n t z i a n l i n e s .

F i g . I : The bf6ssbauer s p e c t r a o f

"

^{' ~ n}i n t h e AI-2. S X I O - ~ S ~ a l l o y a i r - c o o l e d ( A ) and quenched(B) from 8 7 3 K.

F i g u r e 2 shows t h e c o n c e n t r a t i o n dependence o f t h e s p e c t r a . L i n e p o s i t i o n and w i d t h i n f i g u r e 2 were deduced from t h e a n a l y s i s u s i n g a s i n g l e l i n e .

F o r t h e a i r - c o o l e d specimen, which Sn concen- t r a t i o n was lower t h a n 1 x 1 0 - ~ , s p e c t r u m was w e l l r e p r e s e n t e d by s i n g l e ~ o r e n t z i a n l i n e ( F i g . l ( A ) ) . L i n e p o s i t i o n was c o n s t a n t , 2.32 m/s, i n d e p e n d e n t on t h e c o n c e n t r a t i o n . L i n e w i d t h was a l s o c o n s t a n t and narrow, c o r r e s p o n d i n g t o t h e s i n g l e s t a t e o f Sn

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19792186

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JOURNAL DE PHYSIQUE

Fig. 2 : Sn concentration dependence of line position and width; 0 = air-cooled specimen, = quenched specimen.

These results showed that Sn atoms of these specimens were dissolved in the A1 matrix and not influ- enced by lattice defects or other impurities. It was concluded that solid solution was obtained by the air-cooling of an alloy containing less than 1x10-'~n.

Figure 3 shows the temperature dependence of the line intensity and position of the air-cooled specimen containing 2.5x10-~~n. Line intensity was analyzed by simple Debye model.

L 0 . 0 * ^I

100 2 0 0 300

Temperature ( K )

Fig. 3 : Temperature dependence of line position and intensity. Specimen was air-cooled A1-2.5~10-~ Sn alloy. Line intensity was normalized by that of liq.Np temperature.

temperature approximation of the second-order Doppler shift showed that OD was about 300 K. The discrepan- cy seems to be caused by the deviation from simple Debye model and/or temperature dependence of the isomer shift. The temperature dependent isomer shift of B-Sn / 9 / suggests that the latter is more impor- tant.

Quenched specimens showed the same concentration dependence as reported by Sdrensen and Cotte- rill 161. The spectrum was not fitted to a single Lorentzian line (Fig. I ( B ) ) . It was suggested that multiple state of Sn were formed by the effects of quenched-in vacancies. Figure

4

shows the analysis using two Lorentzian lines.

VELOCITY (m/s)

Fig. 4 : Analysis of spectrum using two Lorentzian lines. Specimen was quenched ~ 1 - 2 . 5 x 1 0 - ~ ~ n alloy.

The position of main component in the spectrum was near that of solid solution, but slight shift toward lower velocity side was observed. The position of sub-component was about 2.8 m / s . The annealing experiment showed that the sub-component was stable up to 453

K

and that the cluster of vacancies and Sn atoms. This suggestion was supported by the concentration dependence of the line position. In the low impurity concentration alloy, the fraction of impurity associated with the cluster increases and as the result, the fraction of sub-component may in- crease. The effective Debye temperature of the sub- component was estimated as 105

K

from the temperature dependence of the line intensity. The low Debye temperature also suggested that Sn atoms associated with defects.

The effective Debye temperature OD was 173

K 2

10

K.

In contrast, analysis of line position using the

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References

/ I /

Vogl,

G . ,

Mansel, W. and Vogl. W.,

3 .

Phys.F e t a 1

Phys.5

(1974) 2321.

/ 2 /

Mansel, W. and Vogl, G.,

3 .

Phys. F Metal Phys. 1

(1977) 253.

/ 3 /

Mansel, W., Mayer, H., and Vogl,

G . ,

Radiat. Eff.

35 (1978) 69.

/ 4 /

Ichinose, H., Sassa, K., Ishida, Y., and Kato,

M.

Philos.

Mag.

36

(1977) 1367.

1.51

Sassa, K., Goto, H., Ishida, Y. and Kato,

M.,

Scr.

Met. 11

(1977) 1029.

/6/

Sirensen, K.O. and Cotterill, R.M.J., Acta

Met.;, (1974) 1331.

/ 7 /

Kimura, H. and Hasiguti, R.R.,

3 .

Phys. Soc. Japan

I8 (1963) 73.

-

/8/

Kimura,

H.

and Hasiguti, R.R., Acta Met. 9

⁽¹⁹⁶¹⁾

1076.

/9/

Rothberg,

G.M.,

Guimard, S. and Benczer-Koller, N.

Phys. Rev. fl

(1970) 136.