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XPS study of RNi4B compounds, where R = Nd, Tb, Dy, Ho and Er

C. LAZĂR1, E. BURZO1, M. NEUMANN2,*

Affiliation

  1. Faculty of Physics, Babes-Bolyai University Cluj-Napoca, Romania
  2. Fachbereich Physik, Universität Osnabrück, Germany

Abstract

The RNi4B compounds with R = Nd, Tb, Dy, Ho and Er crystallize in CeCo4B-type structure. XPS measurements were performed at room temperature. The Ni 2p1/2 and Ni 2p3/2 core level lines reproduce well those of pure nickel. In all samples, the presence of Ni 6 eV satellite line was shown. This indicates the presence of holes in Ni 3d band, in agreement with magnetic measurements. The R 4d core levels are similar to those evidenced in pure R metals. The 4f orbitals keep their localized character and therefore the XPS spectra show multiplet structures. The small energy shift of R4d and R4f core level lines, as compared to R metals, may be correlated with minor changes in shielding which result from modification of electron concentrations when compounds are formed..

Keywords

Rare earth compounds, XPS studies.

Submitted at: Feb. 25, 2008
Accepted at: April 4, 2008

Citation

C. LAZĂR, E. BURZO, M. NEUMANN, XPS study of RNi4B compounds, where R = Nd, Tb, Dy, Ho and Er, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 4, pp. 780-782 (2008)