Crystal Phase and Phonon Densities of States of β'-SiAION Ceramics, Si6-zAlzOzN8-z (0 ≤z≤ 4) |
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Authors: | Chun-Keung Loong James W Richardson Jr Sugura Sukuzi Masakuni Ozawa |
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Affiliation: | Intensed Pulsed Neutron Source Division, Argonne National Laboratory, Argonne, Illlinois 60439-4814;Ceramics Research Laboratory, Nagoya Institute of Technology, Gifu 507, Japan |
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Abstract: | The crystal structure and phonon densities of states (DOS) of β-SiAlON ceramics, Si6_ z Al z O z N8-z (0 < z < 4), prepared by a novel slipcast method, are studied by neutron-scattering techniques. The samples with z < 4 form a single-phase solid solution of Si-Al-O-N isostructural to β-Si3N4 (space group P 6 3/m). A consistent preferential occupation of the 2c sites by oxygen atoms and the 6 h sites by nitrogen atoms exists within this structure. The phonon DOS of β'-SiAlON displays phonon bands at ~50 and 115 meV. These features are considerably broader than the corresponding ones in β-Si3N4 powder. |
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