Abstract
The x(0.66CuO-0.34V 2O 5) · (1 - x)As 2O 3 vitreous system ( xCVA) with x = 0.40, 0.50, 0.60 and 0.70 was investigated by magnetic susceptibility and electron paramagnetic resonance (EPR) measurements. Magnetic susceptibility measurements were performed using a Faraday-type balance in the temperature range 80 to 300 K. EPR investigation was performed at room temperature at 9.4 GHz. EPR data show that magnetic properties of the xCVA glasses are determined by the presence of V 4+ and Cu 2+ ions in the vitreous matrix. The magnetic susceptibility of these glasses obeys the Curie-Weiss law with negative Curie temperatures suggesting the presence of exchange interactions between the V 4+ and Cu 2+ ions. Magnetic interactions between the V 4+ and Cu 2+ ions determine formation of antiferromagnetically coupled mixed TM ion pairs in the xCVA glasses.
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