Magnetic Interaction between Iron Particles in Lithium Phosphate Systems

The glasses from the system x Fe 2 O 3 (100 – x )[P 2 O 5 · Li 2 О] with 0 < x < 50 mol % are studied. These materials have been prepared and characterized by magnetic susceptibility. Iron ions generally modify in different ways the local structure of these glasses, depending on the presence of Li 2 O in the glass matrix. The results have shown the presence of antiferromagnetic or ferromagnetic interactions between iron ions in the studied glass and temperature range. These data revealed that the valence states and the distribution of iron ions in the glass matrix depend on the Fe 2 O 3 content, and can determine the decreasing of magnetic momentum (μ eff ).