Structural and magnetic studies of CuO-TeO 2 and CuO-TeO 2 -B 2 O 3 glasses

F. Ciorcas, S.K. Mendiratta, I. Ardelean and M.A. Valente
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F. Ciorcas: University of Aveiro
S.K. Mendiratta: University of Aveiro
I. Ardelean: Faculty of Physics, Babes-Bolyai University
M.A. Valente: University of Aveiro

The European Physical Journal B: Condensed Matter and Complex Systems, 2001, vol. 20, issue 2, 235-240

Abstract: Abstract: The glass systems xCuO . (1- x)TeO2 and xCuO . (1- x)[75TeO2 . 25B2O3] with 0 20 mol%, the Cu2+ ions are predominantly clustered and are coupled through antiferromagnetic exchange interaction. A comparative study of amorphous X-ray diffraction pattern of the glasses indicates a structural modification in the TeO2 network with increasing CuO concentration; the effect is quite visible in the samples with CuO concentrations higher than 20 mole percent. Measurements of density corroborate the conclusions drawn from the X-ray diffraction. Additionally, we show that our data validates a model in which CuO rich regions are surrounded by a buffer boundary which separates them from the tellurite glassy network; effect of introducing B2O3 can be best described as breaking these regions into smaller size regions.

Keywords: PACS.; 61.43.Fs; Glasses; –; 76.30.Fc; Iron; group; (3d); ions; and; impurities; (Ti-Cu) (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1007/PL00022985

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