STRUCTURAL EFFECTS IN SECONDARY ION EMISSION OF Fe–30.2%Ni AND Fe–36%Ni INVAR ALLOYS
V. P. Ivanov, S. N. Trukhan
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: secondary ion emission, iron-nickel invar alloys, phase magnetic transition
Abstract
Experimentally, in the range of 300–700 K, the temperature dependences of secondary ion emission (SIE) for iron-nickel alloys with nickel content of 30.2 % and 36 % are studied by secondary ion mass spectrometry. The observable changes in SIE for iron and nickel ions in the neighborhood of the Curie point are due to magnetic transition, which we hold to be a first-order phase transition. The influence of carbon contained in the alloys manifests itself in the form of SIE peaks at 530–630 K.
|
