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Fe and Ni impurities in synthetic diamond
-
Yue Meng
,
Matthew Newville
Veröffentlicht/Copyright:
31. März 2015
Abstract
Using synchrotron X-ray fluorescence (XRF) microanalysis, including XRF tomography, and Xray absorption near-edge structure (XANES) analyses, the distribution, and nature of incorporation of Fe and Ni impurities in as-grown diamond crystals, synthesized under high-pressure and hightemperature (HPHT) conditions, have been characterized. We find significantly different behavior for Fe and Ni as impurities in diamond. Nickel is dispersed and sector-zoned, with concentrations in {111} growth sectors at least 3 times those in {100} sectors, whereas Fe exists in the form of microaggregates or clusters with no observable sector correlation. Fe K-edge XANES shows that Fe is oxidized in diamond and has a valence of 2+. Comparison of XANES spectra from numerous standard compounds indicates that Fe is very likely bonded with oxygen as FeO.
Received: 2002-12-18
Accepted: 2003-5-31
Published Online: 2015-3-31
Published in Print: 2003-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- Structural systematics of hydrous ringwoodite and water in earth’s interior
- Compressibility of phase Egg AlSiO3OH: Equation of state and role of water at high pressure
- Synchrotron infrared spectroscopy of OH-chondrodite and OH-clinohumite at high pressure
- Structural deformation mechanisms of zeolites under pressure
- Variation of hydrogen bonded O···O distances in goethite at high pressure
- Pressure-controlled polytypism in hydrous layered materials
- OH– in synthetic and natural coesite
- Pressure-induced phase transformation of kalicinite (KHCO3) at 2.8 GPa and local structural changes around hydrogen atoms
- Potential docking sites and positions of hydrogen in high-pressure silicates
- Contrasting bonding behavior of two hydroxyl-bearing metamorphic minerals under pressure: Clinozoisite and topaz
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