Dopant Site Determination in Iron Oxide Nanoparticles Utilizing X-ray Absorption Techniques

Monday, September 9, 2013 - 11:00am

Presented by Dr. Vanessa Pool

The dopant behavior of spinels has been investigated for over half a century and yet new insight into this class of materials is still being made today.  In this work, the question of dopant site preference is explored for the nanoparticle regime.  Iron oxide nanoparticles  have numerous  exciting  applications.  To realize these applications, controlling the preferred dopant site and valence within the host material is important. X-ray Absorption Spectroscopy (XAS) and X-ray Magnetic Circular Dichroism (XMCD) are element specific techniques with magnetic contrast that give insights into the material composition.  Using  both  XAS  and  XMCD,  the  valence  and  dopant  site  can  be determined for various dopant materials, and the affect this has on the nanoparticle’s magnetic properties can be investigated.

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