Alkoxide-hydroxide route for the preparation of {gamma}-LiAlO{sub 2}-based ceramics

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Journal of the American Ceramic Society

OSTI ID:142259

Renoult, O; Boncoeur, M ^[1]; Boilot, J ^[2]

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1. CEA/CEREM/DTM/SERC, Gif/Yvette (France)
2. Ecole Polytechnique, Palaiseau (France). Groupe de Chimie du Solide

An alkoxide-hydroxide route has been developed to prepare Li{sub 4 + x}Al{sub 4 {minus} 3x}Si{sub 2x}O{sub 8} (0 {<=} x {<=} 0.25) powders by taking into account fundamental aspects of the sol-gel process. This technique allows one to prepare powders which exhibit the {beta}-LiAlO{sub 2} type of structure after drying at 150 C. The {beta} {yields} {gamma}-LiAlO{sub 2} topotactic transformation spreads over a large temperature range (746 - 839 C for x = 0.125) with no significant dilatometric and enthalpic change. Stoichiometric {gamma}-LiAlO{sub 2}-based ceramics with a large variety of uniform microstructures are fabricated by a direct sintering of {beta}-LiAlO{sub 2} powders in the temperature range of 900 - 1100 C.

• OSTI ID: 142259
• Journal Information: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 1 Vol. 77; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALUMINIUM OXIDES
CRYSTAL-PHASE TRANSFORMATIONS
LITHIUM OXIDES
PHASE STUDIES
SILICON OXIDES
SOL-GEL PROCESS
THERMONUCLEAR REACTOR MATERIALS