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 language | English |
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Pages (from-to) | 103-106 |
Number of pages | 4 |
Journal | Key Engineering Materials |
Volume | 403 |
DOIs | |
Publication status | Published - 2009 |
Keywords
- B-phase
- Cation composition
- EDX
- Glass-ceramics
- Sialon
- TEM