The Influence of Heat Treatment on the Shape of 57Fe Hyperfine Field Induction Distribution in Massive Amorphous Fe61Co10Y8X1B20 (where X = Mo, W)

2018 ◽  
Vol 69 (4) ◽  
pp. 802-805
Author(s):  
Marcin Nabialek
Keyword(s):  
Hyperfine Field ◽  
Thermal Processing ◽  
Amorphous Alloys ◽  
Isothermal Annealing ◽  
Central Atom ◽  
Low Energy ◽  
Topological Order ◽  
Hyperfine Field Distribution ◽  
Transmission Geometry ◽  
Hyperfine Field Distributions

The paper presents the results of Mossbauer research for massive amorphous alloys Fe61Co10Y8Mo1B20 and Fe61Co10Y8W1B20 manufactured using the method of suction of a liquid alloy into a copper water-cooled mold and subjected to thermal treatment at a temperature of 700K / 60 min and 770K / 210 min. The treatment was carried out below the crystallization temperature and it did not lead to the creation in the volume of alloys of crystalline systems showing long-range order of atoms. M�ssbauer research was performed for low energy milled plates in transmission geometry. Then, numerical analysis of these spectra was performed and the corresponding hyperfine field distributions were obtained 57Fe. It has been shown that isothermal annealing has a big influence on the shape of the hyperfine field distribution. As a result of thermal processing, diffusion of the components took place, which caused the occurrence of diverse environments of iron atoms around the central atom. In the volume of all specimens, there was a lack of topological order in the arrangement of atoms.

Magnetic properties of amorphous Fe–Mo–B alloys

1984 ◽  
Vol 62 (7) ◽  
pp. 714-719 ◽  
Author(s):  
R. A. Dunlap ◽  
G. Stroink
Keyword(s):  
Hyperfine Field ◽  
Amorphous Alloys ◽  
Field Component ◽  
Local Environment ◽  
Hyperfine Fields ◽  
Low Field ◽  
A Value ◽  
Field Distributions ◽  
Hyperfine Field Distributions ◽  
Metal Glasses

The magnetization and Fe hyperfine fields of the series of amorphous alloys Fe80−xMoxB20 for x = 0, 2, 4, 7, 10, and 14 have been investigated. The magnetization at 4.2 K decreases from a value of 180 ± 2 emu/g for Fe80B20 to 79 ± 2 emu/g for Fe66Mo14B20 (1 emu = 10 A). The Fe hyperfine field is 2.91 × 105 Oe in Fe80B20 and shows a decrease of approximately 8 × 103 Oe/at. % of Mo (1 Oe = 79.6 A/m). The hyperfine field distributions show a growing low-field component with increasing x. Results are discussed in terms of previous measurements on similar alloys and the local environment of Fe atoms in transition metal glasses.

Mossbauer Studies of Rapid Cooled Amorphous Iron Alloys in as Cast State

2018 ◽  
Vol 69 (1) ◽  
pp. 148-151
Author(s):  
Marcin Nabialek
Keyword(s):  
Numerical Analysis ◽  
Hyperfine Field ◽  
Amorphous Alloys ◽  
Cast State ◽  
Indirect Measure ◽  
Amorphous Iron ◽  
Field Induction ◽  
Field Distributions ◽  
Alloy Addition ◽  
Hyperfine Field Distributions

The study investigated the effect of a small alloy addition (1 atomic %) in alloys Fe61Co10Y8Nb1B20, b - Fe61Co10Y8Zr1B20, c - Fe61Co10Y8W1B20, d - Fe61Co10Y8Mo1B20 on the shape of the Mossbauer spectrum and on the distributions of hyperfine field induction on 57Fe obtained from their numerical analysis. The line factor A [2.5] was also determined in the Zemman�s sextet, which is an indirect measure of ordering for the texture of the spins occurring in the volume of alloys. Based on the analysis of the results, it was found that the Mossbauer spectras are typical of amorphous alloys and the hyperfine field distributions are bimodal.

Temperature dependence of the hyperfine field distributions in the Fe93.5−xNdxZr6.5(x=0, 2) amorphous alloys

1994 ◽  
Vol 75 (10) ◽  
pp. 5853-5855 ◽  
Author(s):  
G. K. Nicolaides ◽  
M. Pissas ◽  
D. Niarchos ◽  
R. D. Taylor ◽  
K. V. Rao
Keyword(s):  
Hyperfine Field ◽  
Temperature Dependence ◽  
Amorphous Alloys ◽  
Field Distributions ◽  
Hyperfine Field Distributions

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

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