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Synthesis, structural and magnetic characterization of the alloy CuAl <inf>0.67</inf>Cr <inf>0.33</inf>S <inf>2</inf>

Abstract:

This paper reports the synthesis, structural and magnetic characterization of the alloy 0.67Cr 0.33S 2. The sample was synthesized using the technique of direct fusion of the constituent elements. Chemical analysis (EDX) allowed establishing the stoichiometric ratios for this alloy. The powder diffraction pattern was indexed and the main phase crystallizes with tetragonal symmetry and unit cell parameters a = 5.3410(1) Å, c = 10.4154(2) Å. This material is isomorphic with the chalcopyrite structure which crystallizes in space group I 4̄2d. Measurements of magnetic susceptibility and electronic paramagnetic resonance, depending on temperature, were performed in a SQUID magnetometer and a Bruker EMX Xband, respectively. The alloy exhibits a ferrimagnetic ordering with Néel temperature ∼ 40 K. The EPR linewidth shows a paramagnetic behavior between 100 and 600 K, while the resonance field and the g factor show a slight variation with temperature. © 2012 Universidad Simón Bolívar.