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Phases in the System Ba 2 SiO 4 ‐Ca 2 SiO 4
Author(s) -
MATKOVIĆ B.,
POPOVIĆ S.,
GRŽETA B.,
HALLE R.
Publication year - 1986
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.1151-2916.1986.tb04716.x
Subject(s) - isostructural , orthorhombic crystal system , analytical chemistry (journal) , phase (matter) , diffraction , materials science , hexagonal crystal system , x ray crystallography , crystallography , differential thermal analysis , mineralogy , chemistry , crystal structure , optics , physics , organic chemistry , chromatography
The system Ba 2 SiO 4 ‐Ca 2 SiO 4 was studied by heating mixtures of Ba 2 SiO 4 and Ca 2 SiO 4 at 1723 K. Six distinct phases resulted; they were examined by both X‐ray diffraction and differential thermal analysis. The phases β ‐(Ba 0.05 Ca 1.95 )SiO 4 and α‐(Ba 0.15 Ca 1.85 )SiO 4 are isostructural with corresponding high‐temperature modifications of Ca 2 SiO 4 . The X phase (Ba 0.48 Ca 1.52 SiO 4 ) is orthorhombic, is a pure phase rather than a solid solution, and is defined for the first time in the present work. The T phase (Ba 1.31 Ca 0.69 SiO 4 ) is hexagonal and interpreted in terms of a unit cell with a doubled c parameter, in contrast with literature data.