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AN INTERMEDIATE COMPOUND IN THE SYSTEM BeO ‐Al 2 O 3 (CHRYSOBERYL)‐Al 2 O 3 (CORUNDUM) *
Author(s) -
Foster Wilfrid R.,
Royal Herbert F.
Publication year - 1949
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.1151-2916.1949.tb18898.x
Subject(s) - corundum , chemistry , crystallography , mineralogy
A bstract The results of studies in the high‐alumina portion of the system BeO‐ Al 2 O 3 do not agree with those of previous workers. An X‐ray study of sintered and fused mixtures in this portion of the system indicates the existence of a hitherto unrecognized compound intermediate between chrysoberyl (BeO‐ Al 2 O 3 ) and corundum (Al 2 O 3 ) and possessing the probable formula BeO‐3 Al 2 O 3 . The new compound is optically almost identical with chrysoberyl but gives a decidedly different X‐ray pattern. Discussion and criticism of earlier work are presented with the aid of equilibrium diagrams.