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.
| Original language | English |
|---|---|
| Pages (from-to) | 1418-1429 |
| Number of pages | 12 |
| Journal | Journal of Materials Research |
| Volume | 14 |
| Issue number | 4 |
| Publication status | Published - Apr 1999 |
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ASJC Scopus subject areas
- Materials Science(all)
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Atomistic structure of sodium and calcium silicate intergranular films in alumina. / Litton, David A.; Garofalini, Steve.
In: Journal of Materials Research, Vol. 14, No. 4, 04.1999, p. 1418-1429.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Atomistic structure of sodium and calcium silicate intergranular films in alumina
AU - Litton, David A.
AU - Garofalini, Steve
PY - 1999/4
Y1 - 1999/4
N2 - 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.
AB - 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.
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UR - http://www.scopus.com/inward/citedby.url?scp=0032626475&partnerID=8YFLogxK
M3 - Article
VL - 14
SP - 1418
EP - 1429
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 4
ER -