Relationship Between Structure and Glass Transition Temperature in Low-silica Calcium Aluminosilicate Glasses: the Origin of the Anomaly at Low Silica Content

$48.00 plus tax (Refund Policy)

Download / Buy Article:

Abstract:

The anomalous behavior of the glass transition temperature (Tg) in low silica calcium aluminosilicate glasses has been related to the structural modifications observed by neutron and X-ray diffraction. The diffraction data indicate that Al and Si are in tetrahedral sites and that Ca atoms are in distorted octahedral sites. By subtracting the correlation functions for glasses at constant SiO2 or constant Al2O3 content, we have shown that Si and Al atoms are introduced in a different way within the glass structure. Si is present in various Qn sites, while Al resides in Q3 and Q4 sites for glasses with high CaO content and enters fully polymerized Q4 sites with increasing SiO2 or Al2O3 content. The higher proportion of Al in Q3 positions at high CaO content yields a depolymerization of the network. The lower connectivity will contribute to a decrease of the viscosity, which may be at the origin of the decrease of Tg for glasses at low silica content.

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1551-2916.2005.00428.x

Affiliations: 1: Laboratoire de Minéralogie-Cristallographie, Universités Paris 6 et 7 et Institut de physique du globe de Paris, CNRS UMR 7590, 75252 Paris cedex 05, France 2: Physique des Minéraux et des Magmas, Institut de physique du globe de Paris, CNRS UMR 7047, 75252 Paris cedex 05, France

Publication date: August 1, 2005

Related content

Tools

Favourites

Share Content

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
X
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more