X-ray photoelectron studies of changes in the electronic structure upon phase transitions in Co–Ni and Co–Fe alloys


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Abstract

The changes in the electronic structure of Co–Ni and Co–Fe systems upon phase transitions are studied. X-ray photoelectron study of the valence-band spectra and the parameters of the multiplet splitting of Co, Ni and Fe 3s spectra is carried out at different temperatures. It is established that the ordering–separation phase transition in Co–Ni alloys takes place in the temperature range of 600–700°C. As opposed to Co–Ni alloys, in the Fe–Co alloy, ordering–separation–ordering phase transitions are observed. High-temperature ordering of the Fe50Co50 alloy is observed above 1200°C. The transition from ordering to separation is shown to lead to changes in the d electron spectra of the valence band and in the parameters of the multiplet splitting of the 3s spectra.

About the authors

I. N. Shabanova

Physical–Technical Institute, Ural Branch

Author for correspondence.
Email: xps@ftiudm.ru
Russian Federation, Izhevsk, 426000

N. V. Lomova

Udmurt State University

Email: xps@ftiudm.ru
Russian Federation, Izhevsk, 426034

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