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001     632041
005     20250723110015.0
024 7 _ |a 10.1016/j.jallcom.2025.180013
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024 7 _ |a 1873-4669
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100 1 _ |a Firlus, Alexander
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245 _ _ |a The origin of magneto-structural coupling in Fe-based bulk metallic glasses
260 _ _ |a Lausanne
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520 _ _ |a All ferromagnetic Fe-based bulk metallic glasses show the Invar effect. It is a magnetic effect that reduces the coefficient of thermal expansion and comes in two forms, a step-type and a peak-type effect. Here, we study the atomic arrangement of an (Fe$_{71.2}$B$_{24}$Y$_{4.8}$)$_{96}$Nb$_4$ bulk metallic glass as a function of temperature and across more than six orders of magnitude in length scale. Combining various synchrotron-based X-ray scattering techniques we show that the Invar effect originates at the atomic scale within the Fe–Fe network. We find no signs of increased spatial correlations due to the ferromagnetic interactions. This shows that no structural rearrangement occurs at the Curie temperature and that the Invar effect is purely of energetic nature. We conclude that the Invar effect has a fundamental base that results from the magnetic interactions of Fe–Fe bonds. Based on this, we provide a model for the magnetic interactions that create the Invar effect in amorphous materials.
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700 1 _ |a Stoica, Mihai
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700 1 _ |a Wright, Jonathan
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700 1 _ |a Sun, Xiao
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700 1 _ |a Schäublin, Robin E.
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700 1 _ |a Löffler, Jörg F.
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773 _ _ |a 10.1016/j.jallcom.2025.180013
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