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Growth of α‐Al 2 O 3 Crystals by Na 2 O Evaporation
Author(s) -
JONES CECIL M.
Publication year - 1971
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.1151-2916.1971.tb12311.x
Subject(s) - evaporation , composition (language) , crystal growth , materials science , crystallography , mineralogy , analytical chemistry (journal) , chemistry , chemical engineering , thermodynamics , chromatography , physics , linguistics , philosophy , engineering
A technique for growing α‐Al 2 O 3 crystals is described in which Na 2 O·11Al 2 O 3 is dissolved in a liquid of composition Na 2 O·4TiO 2 ·3Al 2 O 3 . Alpha Al 2 O 3 is precipitated as Na 2 O evaporates from the system; Na 2 O·11Al 2 O 3 serves as a source of Al 2 O 3 , and Na 2 O in the liquid. The content of solids in the mixture is always such that it does not melt completely. The size of the α‐Al 2 O 3 crystals grown is related to the Na 2 O content of the composition. Crystals as large as 4000 by 3000 μm in the α‐axis direction and 500 μm in the c ‐axis direction have been grown.