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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Effect of stress gradient at the vicinity of a crack tip on ionic diffusion in silicate glasses : an AFM study</title>
<creator>Celarie, F.</creator>
<creator>Ciccotto, Matteo</creator>
<creator>George, Matthieu</creator>
<creator>Marliere, Christian</creator>
<contributor>Laboratoire des colloïdes, verres et nanomatériaux (LCVN) ; Université Montpellier 2 - Sciences et Techniques (UM2) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>Fractography of glasses an ceramics V</source>
<source>The Fifth Conference on the Fractography of Glasses and Ceramics</source>
<coverage>Rochester, United States</coverage>
<contributor>James R. Varner J.; Quinn G.; Wightman M.</contributor>
<publisher>wiley</publisher>
<identifier>hal-00408605</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00408605</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00408605</source>
<source>James R. Varner J.; Quinn G.; Wightman M. The Fifth Conference on the Fractography of Glasses and Ceramics, Jun 2006, Rochester, United States. wiley, pp.35, 2007</source>
<language>en</language>
<subject lang=en>stress gradient</subject>
<subject lang=en>silicate glasse</subject>
<subject lang=en>AFM study</subject>
<subject lang=en>Ionic Diffusion</subject>
<subject lang=en>Soda−lime−silica Glass</subject>
<subject lang=en>Crack Growth</subject>
<subject lang=en>Atomic Force Microscopy</subject>
<subject>PACS: 62.20.Mk; 66.30.-h; 68.03.Cd; 68.37.Ps</subject>
<subject>[SPI.MAT] Engineering Sciences [physics]/Materials</subject>
<type>info:eu-repo/semantics/conferenceObject</type>
<type>Conference papers</type>
<description lang=en>The slow advance of a crack in sodo-silicate glasses was studied at nanometer scale by in-situ atomic force microscopy (AFM) in a well-controlled atmosphere (N2 and H2O). An enhanced diffusion of sodium ions in the stress-gradient field at the sub-micrometric vicinity of the crack tip was revealed through several effects: growth of nodules in height images, changes in the AFM tip–sample energy dissipation as detected in phase images. Ex-situ chemical micro-analyses completed the AFM measurements. The nodules patterns revealed a dewetting phenomenon evidenced by “breath figures”, i.e. analog to the fogging that occurs when a vapour condenses onto a 'cold' surface [D. Beysens et al., Phys. Rev. Let. 57, 1433 (1986)]. These experimental results were explained by a two-step process: i) a fast migration of sodium ions towards the fracture surfaces as proposed by Langford et al. [J. Mat. Res. 6, 1358 (1991)], ii) a slow backwards diffusion of the cations as evidenced in these AFM experiments (typical time: few minutes). Measurements of the diffusion coefficient of that relaxing process were done at room temperature. Our results strengthen the theoretical concept of a near-surface structural relaxation due to the stress-gradient at the vicinity of the crack tip. Raman and SIMS studies revealed that nodules – for samples studied after exposition to common air - are preferentially covered by an organic overlayer of a carboxylate salt with a long aliphatic chain. The catalytic role of sodium ions in that chemical process is suspected.</description>
<date>2006-06-09</date>
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