Magnetic properties and structure of (Fe100-xGex)0.95Ni0.05 alloys (x = 0, 5, 10, 15, 20)

In this paper structural and magnetic properties of Fe-based alloys (Fe100-xGex)0.95Ni0.05 (x = 0, 5, 10, 15, 20) were studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), magnetic and 57Fe Mössbauer spectroscopy measurements. Also, Density Functional Theory (DFT) calculations...

Full description

Saved in:
Bibliographic Details
Published in:Intermetallics 2021-05, Vol.132, p.107141, Article 107141
Main Authors: Kądziołka-Gaweł, M., Bajorek, A., Goraus, J., Łopadczak, P., Oboz, M.
Format: Article
Language:English
Subjects:
Alloys
Crystal structure
Cubic lattice
Density functional theory
Density functional theory (DFT)
Ferromagnetism
Ferrous alloys
Fe–Ni-Ge alloys
Iron 57
Lattice parameters
Magnetic moments
Magnetic properties
Magnetism
Mossbauer spectroscopy
Mössbauer spectroscopy
Nickel
Photoelectrons
Spectrum analysis
Structure
X ray photoelectron spectroscopy
X-ray diffraction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper structural and magnetic properties of Fe-based alloys (Fe100-xGex)0.95Ni0.05 (x = 0, 5, 10, 15, 20) were studied by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), magnetic and 57Fe Mössbauer spectroscopy measurements. Also, Density Functional Theory (DFT) calculations were used to study preferred crystal structure for Fe–Ni alloys with different Ge concentration. The results indicate that the addition of less than 20% Ge leads to preferred formation of alloys with bcc-type structure. The XRD measurement shows that all the investigated compounds have a body-centred cubic structure and the lattice constant increases with an increase in Ge concentration in the alloy from 2.87092 A˙ (x = 0) to 2.88594 A˙ (x = 20). The investigation of magnetic properties of (Fe100-xGex)0.95Ni0.05 proved their ferromagnetic behaviour, but magnetic moment per atom decreases with an increase in Ge concentration in the alloy from 2.31 μB (x = 0) to 1.66 μB (x = 20). In a temperature of about 820 K structural transformation from body-centred to face-centred cubic structure was observed for all the alloys. The temperature of this transformation was constant and independent of Fe or Ge concentration in the alloy. •Structural and magnetic properties of the (Fe100-xGex)0.95Ni0.05 alloys, where x = 0, 5, 10, 15, 20 were investigated.•In the investigated range of Ge concentration all the alloys crystallised in a single bcc structure.•DFT calculations indicate that for Fe–Ge alloys, Ge concentration x50% leads to preferred formation of bcc-type structure.•At a temperature of 820 K structural transformation from bccto fcc structure was observed. The temperature of the transformation did not depend on Ge concentration but was stabilised by Ni.•All the investigated alloys are ferromagnetic. Magnetic moment per atom and hyperfine magnetic field decrease with an increase in Ge concentration in the alloys.•Magnetic moment per atom and hyperfine magnetic field decrease with an increase in Ge concentration in the investigated alloys.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2021.107141