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Crystal structures and magnetic properties of nickel based compounds

E. BURZO1,*

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, Cluj-Napoca, Romania

Abstract

The RNi5 compounds where R is a rare-earth or yttrium crystallize in a hexagonal structure of CaCu5-type. This structure is maintained in RNi5-xMx systems with M = Cu or Al up to x=2. Magnetic measurements and band structure calculations were performed in order to determine the magnetic moments at Ni sites in RNi5-xMx compounds with R=Nd,Tb,Dy and Ho as well as in GdxLa1-xNi5 one. The LaNi5-xMx are paramagnetic. A critical field of the order of 0.4 MOe is necessary to induce a Ni moment. Then, the nickel moments are linearly dependent on exchange fields. The magnetic behaviour of nickel in the above systems is analysed in models that take into account electron correlations effects in d bands..

Keywords

Rare-earth intermetallic compounds, Magnetic properties, Band structure calculations.

Submitted at: Jan. 25, 2007
Accepted at: April 15, 2007

Citation

E. BURZO, Crystal structures and magnetic properties of nickel based compounds, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 4, pp. 1113-1119 (2007)