Abstract

Room temperature ferromagnetic Gd5Si4 nanoparticles were synthesized using arc-melting and high-energy ball milling. We demonstrate that these particles can be used as potential T2 contrast agents for magnetic resonance imaging (MRI). The ball-milled Gd5Si4 nanostructured material shows a ferromagnetic-to-paramagnetic transition at 320 K, revealing long-range magnetic order of the Gd5 Si4 phase. Echo time was measured in a 7 T magnetic resonance imaging system and shows significant reduction compared to that reported for superparamagnetic iron oxide nanoparticles. These results show the potential of Gd5Si4 ferromagnetic nanoparticles as T2 contrast agents for MRI.

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