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Phase Relations and Structural Phenomena in the Fluoride‐Model Systems LiF‐BeF 2 and NaF‐BeF 2
Author(s) -
ROY DELLA M.,
ROY RUSTUM,
OSBORN E. F.
Publication year - 1950
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.1151-2916.1950.tb12766.x
Subject(s) - fluoride , cristobalite , chemistry , phase (matter) , melting point , hydrofluoric acid , inorganic chemistry , analytical chemistry (journal) , materials science , chromatography , metallurgy , quartz , organic chemistry
Phase‐equilibrium data are presented for the system LiF‐BeF 2 and for the BeF 2 end of the systems NaF‐BeF 2 and RbF‐BeF 2 . The systems LiF‐BeF 2 and NaF‐BeF 2 are weakened models, respectively, of ZnO‐SiO 2 and CaO‐SiO 2 but with the notable difference that liquid immiscibility does not appear in the fluoride systems. The melting point of the cristobalite form of BeF 2 has been determined as 543°± 5°C. and that of the willemite model (Li 2 BeF 4 ) as 458 ± 5°C. Data obtained for the compound Na 2 LiBe 2 F 7 show that its structure is very similar to that of the melilite hardystonite (Ca 2 ZnSi 2 O 7 ).