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Atomistic Structure of Sodium and Calcium Silicate Intergranular Films in Alumina

Published online by Cambridge University Press:  31 January 2011

David A. Litton  and
Stephen H. Garofalini
David A. Litton
Affiliation:
Department of Ceramic and Materials Engineering, Interfacial Molecular Science Lab, Rutgers, The State University of New Jersey, 607 Taylor Road, Piscataway, New Jersey 08854
Stephen H. Garofalini
Affiliation:
Department of Ceramic and Materials Engineering, Interfacial Molecular Science Lab, Rutgers, The State University of New Jersey, 607 Taylor Road, Piscataway, New Jersey 08854
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Abstract

Sodium silicate intergranular films (IGF) in contact with the [0001] basal plane of α-alumina were studied using the molecular dynamics computer simulation technique. The results were compared to previous simulations of calcium silicate and sol-gel silica IGF's in contact with alumina. An ordered, cagelike structure was observed at the interface. Sodium ions segregated to the cages at the interfaces. Calcium and hydrogen ions were also observed to segregate to the cages in the previous simulations. The modifier ions were surrounded by more oxygen ions in the cages at the interface than in the bulk of the IGF. This explains the segregation of modifiers at the interface. Interface energy decreased as the sodium content of the IGF increased. Interface energy decreased faster as a function of Na2O content than as a function of CaO content. However, interface energy decreased slower as a function of Na+ content than as a function of Ca2+content.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 4 , April 1999 , pp. 1418 - 1429
Copyright
Copyright © Materials Research Society 1999

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