Abstract
Abstract Samples of the x Fe 2 O 3 ·(1− x )TeO 2 and x CuO·(1− x )TeO 2 glass systems with x ≤0.50 were prepared by melt quenching and sol–gel processes and were investigated by electron paramagnetic rezonance (EPR) spectroscopy and magnetic susceptibility measurements. EPR data show the presence of Fe 3+ and Cu 2+ ions in the host glass matrices. Analysis of compositional evolution of EPR spectra reveals the distribution of Fe 3+ and Cu 2+ ions in the tellurate glass and offers information on their interactions and microvicinities. Magnetic susceptibility and EPR data prove that iron and cooper ions are present in the host tellurate glass as isolated species and species coupled by dipolar and exchange interactions of antiferromagnetic nature. These data show an important clustering tendency of iron and cooper ions in the studied tellurate glasses. As proved by EPR and magnetic susceptibility data, besides the Fe 3+ and Cu 2+ ions, Fe 2+ and Cu + species are also present in the studied tellurate glasses. The Fe 3+ →Fe 2+ and Cu 2+ →Cu + reduction processes occur in these samples with different intensities as function of the preparation technique and samples composition influencing their magnetic behavior.
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