Fizika Nizkikh Temperatur: Volume 43, Number 8 (August 2017), p. 1224-1228    ( to contents , go back )

Synthesis, crystal structure, electric and magnetic properties of new UNiSi2 splat

Z. Molčanová1, M. Mihalik1, M. Mihalik, Jr.1, M. Rajňák1, M. Zentková1, M. Huráková1, V. Kavečanský1, M. Paukov2,

L. Havela2, M. Cieslar2, and K. Milianchuk2,3

1Institute of Experimental Physics SAS, Watsonova 47, 040 01 Košice, Slovakia

2Charles University, Faculty of Mathematics and Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

3Ivan Franko National University of Lviv, 1 Universytetska Str., Lviv 79000, Ukraine
E-mail: zentkova@saske.sk

Received January 31, 2017

Abstract

We explored the crystal structure, magnetic and transport properties of UNiSi2 material, which was prepared by rapid solidification — splat cooling. The UNiSi2 splat is mostly single phase, the refinement of crystal structure indicated orthorhombic CeNiSi2-type structure (space group Cmcm) with lattice parameters a = 4.0082 Å, b = 16.0813 Å and c = 4.0064 Å. Also SEM analysis revealed the morphology exhibiting dendritic grains in the matrix. TEM images indicate mixed structure formed by crystalline particles embedded into amorphous or nanocrystalline matrix. Magnetic and electrical properties of the splat resemble properties of samples, which were prepared by conventional methods, exhibiting a ferromagnetic transition at about 91 K and similar temperature dependence of resistivity. The coercive field of μ0Hc = 2.25 T is much enhanced due to the magnetic anisotropy introduced by the sample preparation technique. Barkhausen jumps were observed on the hysteresis loop. Magnetization of the sample does not saturate in magnetic fields up to μ0H = 18 T.

PACS: 75.50.–y Studies of specific magnetic materials;
PACS: 75.50.Tt Fine-particle system; nanocrystalline materials.

Key words: magnetic anisotropy, Barkhausen jumps, magnetic hysteresis, UNiSi2 splat.

Published online: June 26, 2017

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