• journal_title：American Mineralogist
• Contributor：Claire Carvallo ; Philippe Sainctavit ; Marie-Anne Arrio ; Nicolas Menguy ; Yuheng Wang ; Georges Ona-Nguema ; Sandrine Brice-Profeta
• Publisher：Mineralogical Society of America
• Date：2008-
• Format：text/html
• Language：en
• Identifier：10.2138/am.2008.2713
• journal_abbrev：American Mineralogist
• issn：0003-004X
• volume：93
• issue：5-6
• firstpage：880
• section：Articles

X-ray magnetic circular dichroism (XMCD) experiments were carried out to compare the Fe²⁺/ Fe³⁺ ratio in nanomagnetite chemically produced from lepidocrocite and nanomagnetite biogenically produced by the Fe-reducing bacterium Shewanella putrefaciens. Together with TEM imaging, these measurements showed that the biotic magnetite nanoparticles were of excellent quality, with small size dispersion and high crystallinity. From the XMCD measurements, it could be shown that the biogenic nanomagnetite contained a higher amount of Fe²⁺ than the abiogenic nanomagnetite.