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Mössbauer and Raman spectroscopic in situ characterization of iron-bearing minerals in Mars: Exploration and cultural heritage

By
Göstar Klingelhöfer
Göstar Klingelhöfer
Institut für Anorganische und Analytische Chemie, Universität Mainz, Germany
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Fernando Rull
Fernando Rull
Unidad Asociada UVa-CSIC al Centro de Astobiologia, University of Valladolid, Spain
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Gloria Venegas
Gloria Venegas
Unidad Asociada UVa-CSIC al Centro de Astobiologia, University of Valladolid, Spain
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Fernando Gazquez
Fernando Gazquez
Department of Earth Sciences, University of Cambridge, UK
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Jesus Medina
Jesus Medina
Unidad Asociada UVa-CSIC al Centro de Astobiologia, University of Valladolid, Spain
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Published:
January 01, 2017

Abstract

Decreasing the particle size of a solid to the nanoscale has consequences for its crystalline and electronic structures. It also involves a large extension of the surface area, thus modifying its reactivity. This chapter focuses on the effect of particle size on thermodynamic, structural and electronic characteristics and on redox properties. It is commonly accepted that a decrease in particle size increases the reactivity of materials. This is discussed here through the description of three main iron oxide structural groups, namely spinel (magnetite, maghemite), hematite and goethite, which exhibit specific behaviour vs. size effect. The role of structural defects and nanoparticle morphology in terms of reactivity is highlighted.

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Contents

European Mineralogical Union Notes in Mineralogy

Redox-reactive Minerals: Properties, Reactions and Applications in Clean Technologies

I.A.M. Ahmed
I.A.M. Ahmed
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K.A. Hudson-Edwards
K.A. Hudson-Edwards
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Mineralogical Society of Great Britain and Ireland
Volume
17
ISBN electronic:
9780903056588
Publication date:
January 01, 2017

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