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Polymorphism of LiGa 5 O 8 and of LiGa 5 O 8 ‐MgGa 2 O 4 Solid Solutions
Author(s) -
DATTA R. K.
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.tb12285.x
Subject(s) - polymorphism (computer science) , liga , spinel , crystallography , differential thermal analysis , diffraction , materials science , mineralogy , space group , thermodynamics , chemistry , x ray crystallography , metallurgy , physics , optics , medicine , alternative medicine , pathology , fabrication , biochemistry , genotype , gene
High‐temperature X‐ray diffraction and differential thermal analyses showed that LiGa 5 O 8 exists in two polymorphs related by the first‐order transition at 1138°±3°C of the low‐temperature simple‐cubic form, space group (probably) O 7 , to the high‐temperature spinel (fcc) form, space group O h 7 . The transition is rapid, and the high‐temperature form in pure LiGa 5 O 8 could not be quenched to room temperature under the conditions used. However, the high‐temperature polymorph can be quenched under equilibrium conditions when 40 mol% or more MgGa 2 O 4 is present. The subsolidus equilibrium relations in the system MgGa 2 O 4 ‐LiGa 5 O 8 are discussed.