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	Provedor de dados Nature Precedings (1) Autor Andrei Shiryaev (1) Palavra-chave Earth & Environment (1) Tipo do documento Manuscript (1) Ano 2010 (1) País United Kingdom (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 1 Primeira ... 1 ... Última Local environment and valence state of iron in microinclusions in fibrous diamonds: X-ray Absorption and Mössbauer data Nature Precedings Andrei Shiryaev. Iron valence state and local environment in a set of fibrous diamonds from Brazilian and Zairean placers were investigated using X-ray Absorption and Mössbauer spectroscopies. It is shown that the diamonds could be divided into two main groups, differing in the type of dominant Fe-bearing inclusions. In the first group Fe is mostly trivalent and is present in octahedral coordination; diamonds from the second group contain a mixture of Fe^2+^ and Fe^3+^, most likely with Fe^2+^ in dodecahedral coordination. A few other diamonds contain iron in a more reduced state: the presence of metallic Fe and Fe~3~O~4~ is inferred from XAS measurements. Spatially resolved XANES and Mössbauer measurements on polished diamond plates show that in some... Tipo: Manuscript Palavras-chave: Earth & Environment. Ano: 2010 URL: http://precedings.nature.com/documents/4452/version/1 Registros recuperados: 1 Primeira ... 1 ... Última

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