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Heat capacity of amorphous, partly crystalline and polycrystalline DyMn6-xGe6-xFexAlx (0  x  6) system

Z ŚNIADECKI1, I ČURLIK2, M REIFFERS2,3, B IDZIKOWSKI1,4,*

Affiliation

  1. Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland
  2. Institute of Experimental Physics, Watsonova 47, SK-043 53 Košice, Slovakia
  3. Faculty of Sciences, University of Prešov, 17. novembra, SK-080 78 Prešov, Slovakia
  4. Author to whom any correspondence should be addressed.

Abstract

We present heat capacity measurements of DyMn6-xGe6-xFexAlx (0  x  6) in ordered and disordered crystalline states in the magnetic fields up to 9 T and in the temperature range 1.7-200 K to discuss their dependence on structural disorder. Samples in the shape of ribbons were synthesized by a single-roller rapid quenching technique. Starting from the hexagonal alloy DyMn6Ge6 (TbCu7-type structure), the partial substitution of Mn and Ge by Fe and Al leads to the formation of metallic glasses (x = 0 - 2.5), partially (x = 3) or fully ordered alloys (x = 4, 5, 6) in the rapid quenches. The electronic coefficient γeff varies from 70 to about 400 mJ mol-1 K -2 for x=2.5 and 4, respectively, and depends only weakly on stoichiometry, but it depends strongly on structural disorder. Such dependence confirms also our preliminary study on amorphous and partly crystallized Y50Cu42Al8 alloys without any magnetic component..

Keywords

Metallic glasses, Heat capacity, Nuclear states and interactions, Local moment in compounds and alloys.

Submitted at: March 31, 2011
Accepted at: April 11, 2011

Citation

Z ŚNIADECKI, I ČURLIK, M REIFFERS, B IDZIKOWSKI, Heat capacity of amorphous, partly crystalline and polycrystalline DyMn6-xGe6-xFexAlx (0  x  6) system, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 4, pp. 377-380 (2011)