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Formation and Stability of β‐Quartz Solid‐Solution Phase in the Li‐Si‐Al‐O‐N System
Author(s) -
Nordmann Astrid,
Cheng YiBing
Publication year - 1997
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1997.tb03231.x
Subject(s) - silicon oxynitride , quartz , materials science , thermal stability , solid solution , nitrogen , analytical chemistry (journal) , mineralogy , phase (matter) , spodumene , silicon , ceramic , oxygen , chemical engineering , silicon nitride , chemistry , metallurgy , organic chemistry , chromatography , engineering
The development of crystalline phases in lithium oxynitride glass‐ceramics was examined, with particular emphasis placed on the effect of the nitrogen source (AlN or Si 3 N 4 ) on the formation and stability of a β‐quartz solid‐solution ( ss ) phase. Oxynitride glasses derived from the Li‐Si‐Al‐O‐N system were heat‐treated at temperatures up to 1200°C to yield glass‐ceramics in which β‐quartz( ss ) and β‐spodumene( ss ) of approximate composition Li 2 OAl 2 O 3 4SiO 2 formed as major phases and in which X‐phase (Si 3 Al 6 O 12 N 2 ) and silicon oxynitride (Si 2 N 2 O) were present as minor phases. The nitrogen‐containing β‐quartz( ss ) phase that was prepared with AlN was stable at 1200°C; however, the use of Si 3 N 4 as the nitrogen source was significantly less effective in promoting such thermal stabilization. Lattice parameter measurements revealed that AlN and Si 3 N 4 had different effects on the crystalline structures, and it was proposed that the enhanced thermal stability of the β‐quartz( ss ) phase that was prepared with AlN was due to both the replacement of oxygen by nitrogen and the positioning of excess Al 3+ ions into interstitial sites within the β‐quartz( ss ) crystal lattice.