The crystallisation of the yttrium–sialon glass: Y15.2Si14.7Al8.7O54.1N7.4
| Autor: | Yvonne Menke, Lena K. L. Falk, V. Peltier-Baron, W.T. Young, H. Lemercier, Stuart Hampshire |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Sialon
Materials science Nucleation chemistry.chemical_element Mineralogy Crystal growth Yttrium Condensed Matter Physics Microstructure Electronic Optical and Magnetic Materials law.invention Crystal chemistry Chemical engineering law Materials Chemistry Ceramics and Composites Crystallization High-resolution transmission electron microscopy |
| Zdroj: | Journal of Non-Crystalline Solids. 270:6-19 |
| ISSN: | 0022-3093 |
| DOI: | 10.1016/s0022-3093(00)00075-2 |
| Popis: | The development of microstructure during crystallisation of a glass with composition Y15.2Si14.7Al8.7O54.1N7.4 has been studied by analytical and high resolution transmission electron microscopy. Crystal nucleation at temperatures in the range 965–1050°C occurs by the heterogeneous nucleation of lenticular-shaped yttrium, silicon and aluminium containing crystals on silicon-rich clusters that formed during glass preparation. The lenticular crystals have a wide range of composition after heat treatment at 1050°C; the yttrium cation percentage varies around that of the expected B-phase composition Y2SiAlO5N but the aluminium content is lower and the silicon content generally significantly higher than that. The crystals display the hexagonal crystal structure of B-phase, although the results from EDX analysis imply that the atomic arrangement of the lattice is not the previously proposed B-phase structure. Crystal growth during prolonged heat treatment at 1050°C occurs to a significant extent by coalescence. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect