Atomistic structure of sodium and calcium silicate intergranular films in alumina

David A. Litton, Stephen H. Garofalini

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


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 languageEnglish
Pages (from-to)1418-1429
Number of pages12
JournalJournal of Materials Research
Issue number4
Publication statusPublished - Apr 1999

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Atomistic structure of sodium and calcium silicate intergranular films in alumina'. Together they form a unique fingerprint.

Cite this