Ferric Oxide (γ) Nanopowder
http://www.cosmoscience.org/shop/fm-sr-51744-ferric-oxide-g-nanopowder-24070
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γ-Ferric Oxide Nanopowder, 20-50nm, ultra-high purity (99.9%) for magnetic, catalytic, and biomedical applications. Superparamagnetic behavior. 5g
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