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Crystal Chemistry of Some AB 2 O 4 Compounds
Author(s) -
GLASSER F. P.,
GLASSER L. S. DENT
Publication year - 1963
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.1151-2916.1963.tb11755.x
Subject(s) - tridymite , ionic radius , spinel , crystal structure , crystallography , oxide , chemistry , ionic bonding , cristobalite , mineralogy , crystal chemistry , materials science , inorganic chemistry , ion , organic chemistry , quartz , metallurgy , composite material
Compounds having the formulas BaGa 2 O 4 , BaCr 2 O 4 , BaFe 2 O 4 , PbAL 2 O 4 , PbGa 2 O 4 , PbCr 2 O 4 , SrAl 2 O 4 , SrGa 2 O 4 , and SrCr 2 O 4 were synthesized by heating oxide or carbonate mixtures. All were examined by X‐ray powder techniques. Single crystals of BaCr 2 O 4 , SrAl 2 O 4 , SrGa 2 O 4 , and BaGa 2 O 4 were also examined. SrAl 2 O 4 , SrGa 2 O 4 , and BaGa 2 O 4 are structurally similar to BaAl 2 O 4 and are thus related to tridymite (SO 2 ). The occurrence of these stuffed tridymite structures, as well as the other principal structures encountered (spinel, CaFe 2 O 4 , and perovskite types) can be correlated with the ionic radii of the cations. New special structures peculiar to one compound, e.g., α ‐CaCr 2 O 4 , occur at radius ratio values representing a transition between two principal structure types.