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Structure, bonding and morphology of hydrothermally synthesised xonotlite

Black, L, Garbev, K and Stumm, A (2009) Structure, bonding and morphology of hydrothermally synthesised xonotlite. Advances in Applied Ceramics, 108 (3). 138 - 144. ISSN 1743-6753

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Abstract

The authors have systematically investigated the role of synthesis conditions upon the structure and morphology of xonotlite. Starting with a mechanochemically prepared, semicrystalline phase with Ca/Si=1, the authors have prepared a series of xonotlite samples hydrothermally, at temperatures between 200 and 250 degrees C. Analysis in each case was by X-ray photoelectron spectroscopy, environmental scanning electron microscopy and X-ray diffraction. The authors’ use of a much lower water/solid ratio has indirectly confirmed the ‘through solution’ mechanism of xonotlite formation, where silicate dissolution is a key precursor of xonotlite formation. Concerning the role of temperature, too low a temperature (~200 degrees C) fails to yield xonotlite or leads to increased number of structural defects in the silicate chains of xonotlite and too high a temperature (>250 degrees C) leads to degradation of the xonotlite structure, through leaching of interchain calcium. Synthesis duration meanwhile leads to increased silicate polymerisation due to diminishing of the defects in the silicate chains and more perfect crystal morphologies.

Item Type: Article
Copyright, Publisher and Additional Information: © 2009 Maney Publishing. This is an author produced version of a paper published in Advances in Applied Ceramics. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Structure; cement; XPS; synthesis; silicate polymerisation; hydrothermal treatment; xonotlite
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Civil Engineering (Leeds) > Institute for Resillient Infrastructure (Leeds)
Depositing User: Miss Elizabeth Winning
Date Deposited: 01 Oct 2009 09:52
Last Modified: 08 Jul 2014 10:16
Published Version: http://dx.doi.org/10.1179/174367608X353638
Status: Published
Publisher: Published by Maney on behalf of the Institute of Materials, Minerals and Mining
Identification Number: 10.1179/174367608X353638
URI: http://eprints.whiterose.ac.uk/id/eprint/9781

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