SiAlON B-phase glass-ceramic microstructures

Lena K.L. Falk, Yvonne Menke, Stuart Hampshire

Research output: Contribution to journalArticlepeer-review

Abstract

This paper is focussed on the development of micro structure during crystallisation heat treatment of B-phase parent glasses with composition (e/o) 35R:45Si:20Al:83O:17N, where R = Er, Yb, Y or a mixture of Y and Yb. Extensive high resolution analytical transmission electron microscopy has shown that the lenticular B-phase crystals take up a substantial range of composition. The element R is always clearly anti-correlated with the Si, and a larger R 3+ cation radius moves the composition range to lower R contents. It is suggested that a locally increased density in the bi-dimensional network of randomly oriented (Si,Al)(O,N)4 tetrahedra is associated with an increased density of vacancies in the R3+ cation lattice.

Original languageEnglish
Pages (from-to)103-106
Number of pages4
JournalKey Engineering Materials
Volume403
DOIs
Publication statusPublished - 2009

Keywords

  • B-phase
  • Cation composition
  • EDX
  • Glass-ceramics
  • Sialon
  • TEM

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