The crystallisation of the yttrium-sialon glass: Y15.2Si14.7A18.7O54.1N7.4

W. T. Young; L. K.L. Falk; H. Lemercier; V. Peltier-Baron; Y. Menke; S. Hampshire

doi:10.1016/S0022-3093(00)00075-2

The crystallisation of the yttrium-sialon glass: Y_15.2Si_14.7A_18.7O_54.1N_7.4

W. T. Young, L. K.L. Falk, H. Lemercier, V. Peltier-Baron, Y. Menke, S. Hampshire

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Abstract

The development of microstructure during crystallisation of a glass with composition Y_15.2Si_14.7Al_8.7O_54.1N_7.4 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.

Original language	English
Pages (from-to)	6-19
Number of pages	14
Journal	Journal of Non-Crystalline Solids
Volume	270
Issue number	1-3
DOIs	https://doi.org/10.1016/S0022-3093(00)00075-2
Publication status	Published - 11 May 2000

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title = "The crystallisation of the yttrium-sialon glass: Y15.2Si14.7A18.7O54.1N7.4",

abstract = "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.",

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AU - Young, W. T.

AU - Falk, L. K.L.

AU - Lemercier, H.

AU - Peltier-Baron, V.

AU - Menke, Y.

AU - Hampshire, S.

PY - 2000/5/11

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N2 - 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.

AB - 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.

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The crystallisation of the yttrium-sialon glass: Y_15.2Si_14.7A_18.7O_54.1N_7.4

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