Observation of a composition-controlled high-moment/low-moment transition in the face centered cubic Fe–Ni system: Invar effect is an expansion, not a contraction

Hyperfine interactions and local environment effects in FexNi100−x (x=55–67) Invar alloys: 57Fe Mössbauer spectroscopy data at 5K

“…Analysis of the data has conformed unambiguously that the samples have expectation fcc structure without visible contamination by the other phase. The lattice parameters were in a good agreement with results given in the literature ( [10,26] and references therein). The Mössbauer absorption spectra were measured at 5 K using a 57 Co source in a Rh matrix.…”

“…At 5 K, the observed IS value is 0.153(5) mm/s. After the second order Doppler shift correction (according to the procedure described in [10]) the IS value becomes 0.26 mm/s which is very close to the results of the previous measurements [10]. Within the limits of experimental error, any dependence of the IS value on both the composition and the type atomic configuration has not been observed.…”

“…In terms of this theory, the magnetic structure of the alloy is characterized by the existence of nearly degenerate non-collinear states with differing magnetic moments and volumes. In the "frustration" model of the Invar alloys [9][10][11], particular attention has been paid to the antiferromagnetic exchange interaction Fe-Fe. If the Invar alloy is a predominantly collinear ferromagnet, the antiferromagnetic Fe-Fe exchange bonds are not energetically satisfied.…”

Formation and characterization of boride coatings thermochemically grown on the Fe64Ni36 alloy

“…2a and b. The spectrum measured for the Fe 64 Ni 36 alloy, fitted using the H hf distribution reported inside the figure, is typical of an invar alloy [7].…”

New Effects and Interpretation of Amorphous Curie Point Relaxation in FeNi-based Metallic Glasses

“…This fact hints at the possible reminiscence to the sluggish nature of the bcc ↔ fcc transformations characteristic to crystalline FeNi alloys [9]. As a consequence of low transformation rate high and low momentum atomic positions are mixed and randomly distributed in each other even in the crystalline state [10]. The high degree of the hysteretic nature of the α ↔ γ transformation is also characteristic for the crystalline FeNi alloys.…”