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Magnetic and electronic properties of nanocrystalline DyxLa1-xNi5 compounds obtained by high energy ball milling

A. BEZERGHEANU1, E. BURZO2,* , L. CHIONCEL3, E. DOROLTI2, R. TETEAN2

Affiliation

  1. Department of Physics, University of Oradea, Oradea Romania
  2. Babes-Bolyai University, Faculty of Physics, RO-400084, Cluj-Napoca, Romania
  3. Institute for Theoretical Physics and Computational Physics, Graz University of Technology, Graz, A 8010, Austria

Abstract

DyXLa1-XNi5 compounds have been obtained by mechanical milling in a high-energy planetary mill and subsequent annealing under vacuum for different times. Magnetic measurements were performed in the temperature range 4.2–300 K and fields up to 5 T. There is a transition from spin fluctuation behaviour, characteristic for LaNi5, to a ferrimagnetic type ordering for x ≥ 0.2. Band structure calculations were also performed The differences between magnetic moments at 2c and 3g sites, obtained from band structure calculations, were correlated with their local environments The influence of the milling and annealing conditions on the structural and magnetic properties of DyXLa1-XNi5 compounds has been investigated. The magnetocaloric effect was also studied..

Keywords

Mechanical alloying, Magnetization, Band structure.

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

Citation

A. BEZERGHEANU, E. BURZO, L. CHIONCEL, E. DOROLTI, R. TETEAN, Magnetic and electronic properties of nanocrystalline DyxLa1-xNi5 compounds obtained by high energy ball milling, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 4, pp. 805-808 (2008)