DETECTION OF ATOMIC ORDER IN Ni3Fe BY THE 119 Sn SPECTROSCOPY

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DETECTION OF ATOMIC ORDER IN Ni3Fe BY THE 119 Sn SPECTROSCOPY

T. Zemčík, Y. Kreislerová

To cite this version:

T. Zemčík, Y. Kreislerová. DETECTION OF ATOMIC ORDER IN Ni3Fe BY THE 119 Sn SPECTROSCOPY. Journal de Physique Colloques, 1980, 41 (C1), pp.C1-361-C1-361.

�10.1051/jphyscol:19801135�. �jpa-00219619�

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JOURNAL DE PHYSIQUE Colloque Cl

,

supplbment au n O 1, Tome 41, janvier 1980, page C1-361

DETECTION OF ATOMIC ORDER IN N i 3 F e

BY THE

119 Sn SPECTROSCOPY

T. ~ e m 8 i k and Y. Kreislerovg

I n s t i t u t e o f PhysicaZ MetaZZurgy, 616 6 2 B m o , CzechosZovakia.

'l9sn Mbsbauer measurements of p o l a r i z a t i o n hyperfine f i e l d s reported f o r N i Fe [l] i n s t i g a -

3

t e d u s t o attempt the v e r i f i c a t i o n of t h e propo- s e d supermalloy model [2]. I n

5 1

we followed t h e '19sn hyperfine s p l i t t i n g dependence on t h e atomic order. S t r i k i n g s e n s i t i v i t y of t h e s p l i t t i n g on t h e c o o l i n g r a t e between 5 5 0 ~ ~ and 4 5 0 ' ~ was found. The average '19sn e f f e c t i v e f i e l d i n slow- l y cooled samples i s 2.5 times l a r g e r than t h a t of t h e quenched sample. To c l e a r the r o l e of the atomic o r d e r , second s e r i e s of measurements was done a t isothermally annealed samples a l o n g w i t h t h e r e s i s t o n e t r y .

Samples were prepared by vacuum melting from Ni7 Fe with 1 e t . % Sn ( 9 3 % 119~n) and r o l l e d

. 5 25

t o lt5mm. A s e r i e s of isochronous snnealinga was done i n A P H 2 between 5 5 0 ' ~ and 450°c/24 h r s

( 1 0 X s t e p s ) followed by slow c o o l i n g ( c a 7 hrs!.

Roon temperature e l e c t r i c a l r e s i s t i v i t y by t h e four-point method and M6ssbauer transmission s p e c t r a a t t h e c o n s t a n t v e l o c i t y spectrometer w i t h t h e BaSnO source were measured.

Comparison of t h e N i Fe and Ni3FeiSn) r e s i s - 3 3

t i v i t y curves (Fig. 1) i m p l i c a t e t h e d i s o r d e r above t h e c r i t i c a l temperature; i t i n c r e a s e d by t h e t i n a d d i t i o n by 10 K. Mksbauer s p e c t r a j u s t below and above t h e c r i t i c a l temperature d i f f e r s u b s t a n t i a l l y (Fig. 2 ) . By l e a s t - s q u a r e s decompo- s i t i o n i n t o f o u r Zeeman components, average mag- n e t i c s p l i t t i n g was gained (Fig. 1). T h i s c o n f i r - mes t h e primary r o l e of t h e short-range atomic o r d e r i p g and high s e n s i t i v i t y of t h e '19sn spec- t r a on t h e l a t t i c e s t r u c t u r e .

The e x p l a n a t i o n of t h i s e f f e c t might be pre- f e r e d s u b s t i t u t i o n of Sn i n high p o l a r i z a t i o n si- t e s i n t h e ordered N i Fe s t r u c t u r e (compare t h e

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' s p l i t t i n g of 6.7 mm/s i n F e ( S n ) ) , whereas above t h e o r d e r i n g temperature t i n i s surrounded prefe- r a b l y by n i c k e l atoms (compare t h e Ni(Sn) a p l i t - t i n g of 1.2 mm/s). To v e r i f y t h i s hypothesis, l o n g e r isothermal a n n e a l s a r e t r i e d and quaei- -continous f i e l d d i s t r i b u t i o n sought.

T C'cl

Fig. 1 Average '19sn s p l i t t i n g , go, and r e s i s t i - v i t y , p

,

vs. annealing temperature T.

I I 1 I 1 I I I

-5 0 5 X)

v [mm/s]

Fig. 2 MBssbauer s p e c t r a of 119sn i n Ni3Fe.

References

Ll]

ÎNFFUN^G.O. ând^DUNMYRE^G.0.r ÂIPConf .Proc.

2

(1971

,

544.

[2] RASSMANN H.C. and HOFMANN U. r i n Magnetismus, L e i p t i g 1967, 176.

[3]

Z E M E ~ K

T.8 phys. s t a t . s o l . ( a )

2

(1979%) K1Z

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19801135