Abstract
Glasses of the x Fe 2 O 3 · (100 - x)[2 B 2 O 3 · SrO ] system (0 ≤ x ≤ 40 mol% ) were prepared and studied by electron paramagnetic resonance (EPR) and magnetic susceptibility measurements. EPR investigations indicated the compositional domains favorable to the presence of isolated iron ions or to those magnetically clustered. The magnetic susceptibility data evidenced the presence of both Fe 3+ and Fe 2+ ions, with their relative content depending on the Fe 2 O 3 concentration. Dipolar and superexchange interactions involving iron ions were revealed depending on the iron content of the sample.
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